添加产品介绍网页

.gitignore

@@ -7,6 +7,8 @@ docs/
 
 # --- Backend (Go) ---
 backend/hightube.db
+backend/hightube.db-shm
+backend/hightube.db-wal
 backend/server
 backend/*.exe
 backend/*.out

backend/cmd/server/main.go

@@ -1,6 +1,12 @@
 package main
 
 import (
+	"flag"
+	"fmt"
+	"net/http"
+	"os"
+	"time"
+
 	"hightube/internal/api"
 	"hightube/internal/chat"
 	"hightube/internal/db"
@@ -8,9 +14,16 @@ import (
 	"hightube/internal/stream"
 )
 
+type serverConfig struct {
+	apiPort  int
+	rtmpPort int
+}
+
 func main() {
+	cfg := parseFlags()
+
 	monitor.Init(2000)
-	monitor.Infof("Starting Hightube Server v1.0.0-Beta4.1")
+	monitor.Infof("Starting Hightube Server v1.0.1")
 
 	// Initialize Database and run auto-migrations
 	db.InitDB()
@@ -18,21 +31,52 @@ func main() {
 	// Initialize Chat WebSocket Hub
 	chat.InitChat()
 
-	srv := stream.NewRTMPServer()
+	srv := stream.NewRTMPServer(fmt.Sprintf("%d", cfg.rtmpPort))
 
 	// Start the API server in a goroutine so it doesn't block the RTMP server
 	go func() {
+		apiAddr := fmt.Sprintf(":%d", cfg.apiPort)
 		r := api.SetupRouter(srv)
-		monitor.Infof("API server listening on :8080")
-		monitor.Infof("Web console listening on :8080/admin")
-		if err := r.Run(":8080"); err != nil {
+		httpServer := &http.Server{
+			Addr:              apiAddr,
+			Handler:           r,
+			ReadHeaderTimeout: 5 * time.Second,
+			IdleTimeout:       60 * time.Second,
+			MaxHeaderBytes:    1 << 20,
+		}
+		monitor.Infof("API server listening on %s", apiAddr)
+		monitor.Infof("Web console listening on %s/admin", apiAddr)
+		if err := httpServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
 			monitor.Errorf("Failed to start API server: %v", err)
 		}
 	}()
 
 	// Setup and start the RTMP server
+	rtmpAddr := fmt.Sprintf(":%d", cfg.rtmpPort)
 	monitor.Infof("Ready to receive RTMP streams from OBS")
-	if err := srv.Start(":1935"); err != nil {
+	if err := srv.Start(rtmpAddr); err != nil {
 		monitor.Errorf("Failed to start RTMP server: %v", err)
 	}
 }
+
+func parseFlags() serverConfig {
+	cfg := serverConfig{}
+	flag.IntVar(&cfg.apiPort, "api-port", 8080, "API/Web console listen port")
+	flag.IntVar(&cfg.rtmpPort, "rtmp-port", 1935, "RTMP listen port")
+	flag.Parse()
+
+	if !validPort(cfg.apiPort) {
+		fmt.Fprintf(os.Stderr, "invalid --api-port %d: port must be between 1 and 65535\n", cfg.apiPort)
+		os.Exit(2)
+	}
+	if !validPort(cfg.rtmpPort) {
+		fmt.Fprintf(os.Stderr, "invalid --rtmp-port %d: port must be between 1 and 65535\n", cfg.rtmpPort)
+		os.Exit(2)
+	}
+
+	return cfg
+}
+
+func validPort(port int) bool {
+	return port >= 1 && port <= 65535
+}

backend/go.mod

@@ -23,7 +23,7 @@ require (
 	github.com/go-playground/validator/v10 v10.30.1 // indirect
 	github.com/goccy/go-json v0.10.5 // indirect
 	github.com/goccy/go-yaml v1.19.2 // indirect
-	github.com/gorilla/websocket v1.5.3 // indirect
+	github.com/gorilla/websocket v1.5.3 // direct
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
@@ -41,7 +41,7 @@ require (
 	go.mongodb.org/mongo-driver/v2 v2.5.0 // indirect
 	golang.org/x/arch v0.22.0 // indirect
 	golang.org/x/net v0.51.0 // indirect
-	golang.org/x/sys v0.41.0 // indirect
+	golang.org/x/sys v0.41.0 // direct
 	golang.org/x/text v0.34.0 // indirect
 	google.golang.org/protobuf v1.36.10 // indirect
 )

backend/internal/api/admin.go

@@ -29,8 +29,8 @@ func AdminLogin(c *gin.Context) {
 		return
 	}
 
-	var user model.User
-	if err := db.DB.Where("username = ?", strings.TrimSpace(req.Username)).First(&user).Error; err != nil {
+	user, err := db.LoadUserByUsername(strings.TrimSpace(req.Username))
+	if err != nil {
 		c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid username or password"})
 		return
 	}
@@ -191,7 +191,7 @@ func UpdateUserRole(c *gin.Context) {
 		return
 	}
 
-	if err := db.DB.Model(&model.User{}).Where("id = ?", userID).Update("role", role).Error; err != nil {
+	if err := db.UpdateUserRole(userID, role); err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to update role"})
 		return
 	}
@@ -218,7 +218,7 @@ func UpdateUserEnabled(c *gin.Context) {
 		return
 	}
 
-	if err := db.DB.Model(&model.User{}).Where("id = ?", userID).Update("enabled", req.Enabled).Error; err != nil {
+	if err := db.UpdateUserEnabled(userID, req.Enabled); err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to update enabled status"})
 		return
 	}
@@ -251,7 +251,7 @@ func ResetUserPassword(c *gin.Context) {
 		return
 	}
 
-	if err := db.DB.Model(&model.User{}).Where("id = ?", userID).Update("password", hash).Error; err != nil {
+	if err := db.UpdateUserPassword(userID, hash); err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to reset password"})
 		return
 	}
@@ -274,11 +274,7 @@ func DeleteUser(c *gin.Context) {
 		return
 	}
 
-	if err := db.DB.Where("user_id = ?", userID).Delete(&model.Room{}).Error; err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to delete rooms"})
-		return
-	}
-	if err := db.DB.Delete(&model.User{}, userID).Error; err != nil {
+	if err := db.DeleteUserCascade(userID); err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to delete user"})
 		return
 	}

backend/internal/api/auth.go

@@ -1,11 +1,13 @@
 package api
 
 import (
+	"errors"
 	"net/http"
 	"os"
 	"strings"
 
 	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
 
 	"hightube/internal/db"
 	"hightube/internal/model"
@@ -41,10 +43,12 @@ func Register(c *gin.Context) {
 	}
 
 	// Check if user exists
-	var existingUser model.User
-	if err := db.DB.Where("username = ?", req.Username).First(&existingUser).Error; err == nil {
+	if _, err := db.LoadUserByUsername(req.Username); err == nil {
 		c.JSON(http.StatusConflict, gin.H{"error": "Username already exists"})
 		return
+	} else if !errors.Is(err, gorm.ErrRecordNotFound) {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to validate username"})
+		return
 	}
 
 	// Hash password
@@ -61,20 +65,13 @@ func Register(c *gin.Context) {
 		Role:     "user",
 		Enabled:  true,
 	}
-	if err := db.DB.Create(&user).Error; err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to create user"})
-		return
-	}
-
-	// Create a default live room for the new user
 	room := model.Room{
-		UserID:    user.ID,
 		Title:     user.Username + "'s Live Room",
 		StreamKey: utils.GenerateStreamKey(),
 		IsActive:  false,
 	}
-	if err := db.DB.Create(&room).Error; err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to create room for user"})
+	if err := db.CreateUserAndRoom(&user, &room); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to create user"})
 		return
 	}
 
@@ -87,9 +84,10 @@ func Login(c *gin.Context) {
 		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
 		return
 	}
+	req.Username = strings.TrimSpace(req.Username)
 
-	var user model.User
-	if err := db.DB.Where("username = ?", req.Username).First(&user).Error; err != nil {
+	user, err := db.LoadUserByUsername(req.Username)
+	if err != nil {
 		c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid username or password"})
 		return
 	}
@@ -127,8 +125,8 @@ func ChangePassword(c *gin.Context) {
 		return
 	}
 
-	var user model.User
-	if err := db.DB.First(&user, userID).Error; err != nil {
+	user, err := db.LoadUserByID(userID.(uint))
+	if err != nil {
 		c.JSON(http.StatusNotFound, gin.H{"error": "User not found"})
 		return
 	}
@@ -147,7 +145,7 @@ func ChangePassword(c *gin.Context) {
 	}
 
 	// Update user
-	if err := db.DB.Model(&user).Update("password", hashedPassword).Error; err != nil {
+	if err := db.UpdateUserPassword(user.ID, hashedPassword); err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to update password"})
 		return
 	}

backend/internal/api/chat_handler.go

@@ -12,6 +12,8 @@ import (
 )
 
 var upgrader = websocket.Upgrader{
+	ReadBufferSize:  1024,
+	WriteBufferSize: 1024,
 	CheckOrigin: func(r *http.Request) bool {
 		return true // Allow all connections
 	},

backend/internal/api/middleware.go

@@ -89,8 +89,8 @@ func authenticateRequest(c *gin.Context) (*model.User, error) {
 		return nil, errInvalidToken
 	}
 
-	var user model.User
-	if err := db.DB.First(&user, uint(userID)).Error; err != nil {
+	user, err := db.LoadUserByID(uint(userID))
+	if err != nil {
 		return nil, errUserNotFound
 	}
 

backend/internal/api/room.go

@@ -6,15 +6,14 @@ import (
 	"github.com/gin-gonic/gin"
 
 	"hightube/internal/db"
-	"hightube/internal/model"
 )
 
 // GetMyRoom returns the room details for the currently authenticated user
 func GetMyRoom(c *gin.Context) {
 	userID, _ := c.Get("user_id")
 
-	var room model.Room
-	if err := db.DB.Where("user_id = ?", userID).First(&room).Error; err != nil {
+	room, err := db.LoadRoomByUserID(userID.(uint))
+	if err != nil {
 		c.JSON(http.StatusNotFound, gin.H{"error": "Room not found"})
 		return
 	}
@@ -29,9 +28,8 @@ func GetMyRoom(c *gin.Context) {
 
 // GetActiveRooms returns a list of all currently active live rooms
 func GetActiveRooms(c *gin.Context) {
-	var rooms []model.Room
-	// Fetch rooms where is_active is true
-	if err := db.DB.Where("is_active = ?", true).Find(&rooms).Error; err != nil {
+	rooms, err := db.ListActiveRooms()
+	if err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to fetch active rooms"})
 		return
 	}

backend/internal/api/router.go

@@ -11,7 +11,8 @@ func SetupRouter(streamServer *stream.RTMPServer) *gin.Engine {
 	// 设置为发布模式，消除 "[WARNING] Running in debug mode" 警告
 	gin.SetMode(gin.ReleaseMode)
 
-	r := gin.Default()
+	r := gin.New()
+	r.Use(gin.Recovery())
 	BindAdminDependencies(streamServer)
 
 	// Use CORS middleware to allow web access
@@ -25,6 +26,8 @@ func SetupRouter(streamServer *stream.RTMPServer) *gin.Engine {
 	r.POST("/api/login", Login)
 	r.POST("/api/admin/login", AdminLogin)
 	r.GET("/api/rooms/active", GetActiveRooms)
+	r.GET("/api/rooms/:room_id/playback-options", GetRoomPlaybackOptions)
+	r.GET("/api/rooms/:room_id/thumbnail", streamServer.HandleThumbnail)
 	r.GET("/live/:room_id", streamServer.HandleHTTPFLV)
 
 	// WebSocket endpoint for live chat
@@ -37,7 +40,6 @@ func SetupRouter(streamServer *stream.RTMPServer) *gin.Engine {
 	authGroup.Use(AuthMiddleware())
 	{
 		authGroup.GET("/room/my", GetMyRoom)
-		authGroup.GET("/rooms/:room_id/playback-options", GetRoomPlaybackOptions)
 		authGroup.POST("/user/change-password", ChangePassword)
 
 		adminGroup := authGroup.Group("/admin")

backend/internal/chat/hub.go

@@ -9,10 +9,12 @@ import (
 )
 
 const (
-	writeWait      = 10 * time.Second
-	pongWait       = 60 * time.Second
-	pingPeriod     = (pongWait * 9) / 10
-	maxMessageSize = 512
+	writeWait           = 10 * time.Second
+	pongWait            = 60 * time.Second
+	pingPeriod          = (pongWait * 9) / 10
+	maxMessageSize      = 512
+	roomQueueBufferSize = 2048
+	historyLimit        = 100
 )
 
 type Message struct {
@@ -32,12 +34,23 @@ type Client struct {
 }
 
 type Hub struct {
-	rooms        map[string]map[*Client]bool
-	roomsHistory map[string][]Message
-	broadcast    chan Message
+	mutex sync.RWMutex
+	rooms map[string]*roomHub
+}
+
+type roomHub struct {
+	roomID       string
+	manager      *Hub
 	register     chan *Client
 	unregister   chan *Client
-	mutex        sync.RWMutex
+	broadcast    chan Message
+	clearHistory chan struct{}
+	stop         chan struct{}
+	stopOnce     sync.Once
+
+	mutex   sync.RWMutex
+	clients map[*Client]struct{}
+	history []Message
 }
 
 type StatsSnapshot struct {
@@ -48,108 +61,179 @@ type StatsSnapshot struct {
 
 func NewHub() *Hub {
 	return &Hub{
-		broadcast:    make(chan Message),
-		register:     make(chan *Client),
-		unregister:   make(chan *Client),
-		rooms:        make(map[string]map[*Client]bool),
-		roomsHistory: make(map[string][]Message),
+		rooms: make(map[string]*roomHub),
 	}
 }
 
-func (h *Hub) Run() {
+func (h *Hub) getRoom(roomID string) *roomHub {
+	h.mutex.RLock()
+	room := h.rooms[roomID]
+	h.mutex.RUnlock()
+	return room
+}
+
+func (h *Hub) getOrCreateRoom(roomID string) *roomHub {
+	if room := h.getRoom(roomID); room != nil {
+		return room
+	}
+
+	h.mutex.Lock()
+	defer h.mutex.Unlock()
+
+	if room := h.rooms[roomID]; room != nil {
+		return room
+	}
+
+	room := &roomHub{
+		roomID:       roomID,
+		manager:      h,
+		register:     make(chan *Client, roomQueueBufferSize),
+		unregister:   make(chan *Client, roomQueueBufferSize),
+		broadcast:    make(chan Message, roomQueueBufferSize),
+		clearHistory: make(chan struct{}, 1),
+		stop:         make(chan struct{}),
+		clients:      make(map[*Client]struct{}),
+	}
+	h.rooms[roomID] = room
+	go room.run()
+	return room
+}
+
+func (h *Hub) deleteRoomIfIdle(room *roomHub) {
+	room.mutex.RLock()
+	idle := len(room.clients) == 0 && len(room.history) == 0
+	room.mutex.RUnlock()
+	if !idle {
+		return
+	}
+
+	h.mutex.Lock()
+	if current := h.rooms[room.roomID]; current == room {
+		delete(h.rooms, room.roomID)
+		room.stopOnce.Do(func() {
+			close(room.stop)
+		})
+	}
+	h.mutex.Unlock()
+}
+
+func (r *roomHub) run() {
 	for {
 		select {
-		case client := <-h.register:
-			h.mutex.Lock()
-			if h.rooms[client.RoomID] == nil {
-				h.rooms[client.RoomID] = make(map[*Client]bool)
-			}
-			h.rooms[client.RoomID][client] = true
-
-			// Send existing history to the newly joined client
-			if history, ok := h.roomsHistory[client.RoomID]; ok {
-				for _, msg := range history {
-					msg.IsHistory = true
-					msgBytes, _ := json.Marshal(msg)
-					// Use select to avoid blocking if client's send channel is full
-					select {
-					case client.Send <- msgBytes:
-					default:
-						// If send fails, we could potentially log or ignore
-					}
-				}
-			}
-			h.mutex.Unlock()
-
-		case client := <-h.unregister:
-			h.mutex.Lock()
-			if rooms, ok := h.rooms[client.RoomID]; ok {
-				if _, ok := rooms[client]; ok {
-					delete(rooms, client)
-					close(client.Send)
-					// We no longer delete the room from h.rooms here if we want history to persist
-					// even if everyone leaves (as long as it's active in DB).
-					// But we should clean up if the room is empty and we want to save memory.
-					// However, the history is what matters.
-					if len(rooms) == 0 {
-						delete(h.rooms, client.RoomID)
-					}
-				}
-			}
-			h.mutex.Unlock()
-
-		case message := <-h.broadcast:
-			h.mutex.Lock()
-			// Only store "chat" and "danmaku" messages in history
-			if message.Type == "chat" || message.Type == "danmaku" {
-				h.roomsHistory[message.RoomID] = append(h.roomsHistory[message.RoomID], message)
-				// Limit history size to avoid memory leak (e.g., last 100 messages)
-				if len(h.roomsHistory[message.RoomID]) > 100 {
-					h.roomsHistory[message.RoomID] = h.roomsHistory[message.RoomID][1:]
-				}
-			}
-
-			clients := h.rooms[message.RoomID]
-			if clients != nil {
-				msgBytes, _ := json.Marshal(message)
-				for client := range clients {
-					select {
-					case client.Send <- msgBytes:
-					default:
-						close(client.Send)
-						delete(clients, client)
-					}
-				}
-			}
-			h.mutex.Unlock()
+		case client := <-r.register:
+			r.handleRegister(client)
+		case client := <-r.unregister:
+			r.handleUnregister(client)
+		case message := <-r.broadcast:
+			r.handleBroadcast(message)
+		case <-r.clearHistory:
+			r.handleClearHistory()
+		case <-r.stop:
+			return
 		}
 	}
 }
 
-// ClearRoomHistory removes history for a room, should be called when stream ends
+func (r *roomHub) handleRegister(client *Client) {
+	r.mutex.RLock()
+	historyCopy := make([]Message, len(r.history))
+	copy(historyCopy, r.history)
+	r.mutex.RUnlock()
+
+	for _, msg := range historyCopy {
+		msg.IsHistory = true
+		msgBytes, err := json.Marshal(msg)
+		if err != nil {
+			continue
+		}
+		select {
+		case client.Send <- msgBytes:
+		default:
+		}
+	}
+
+	r.mutex.Lock()
+	r.clients[client] = struct{}{}
+	r.mutex.Unlock()
+}
+
+func (r *roomHub) handleUnregister(client *Client) {
+	r.mutex.Lock()
+	if _, ok := r.clients[client]; ok {
+		delete(r.clients, client)
+		close(client.Send)
+	}
+	r.mutex.Unlock()
+
+	r.manager.deleteRoomIfIdle(r)
+}
+
+func (r *roomHub) handleBroadcast(message Message) {
+	msgBytes, err := json.Marshal(message)
+	if err != nil {
+		return
+	}
+
+	r.mutex.Lock()
+	if message.Type == "chat" || message.Type == "danmaku" {
+		r.history = append(r.history, message)
+		if len(r.history) > historyLimit {
+			r.history = r.history[1:]
+		}
+	}
+
+	for client := range r.clients {
+		select {
+		case client.Send <- msgBytes:
+		default:
+			close(client.Send)
+			delete(r.clients, client)
+		}
+	}
+	r.mutex.Unlock()
+}
+
+func (r *roomHub) handleClearHistory() {
+	r.mutex.Lock()
+	r.history = nil
+	r.mutex.Unlock()
+	r.manager.deleteRoomIfIdle(r)
+}
+
 func (h *Hub) ClearRoomHistory(roomID string) {
-	h.mutex.Lock()
-	defer h.mutex.Unlock()
-	delete(h.roomsHistory, roomID)
+	if room := h.getRoom(roomID); room != nil {
+		select {
+		case room.clearHistory <- struct{}{}:
+		default:
+		}
+	}
 }
 
 func (h *Hub) RegisterClient(c *Client) {
-	h.register <- c
+	h.getOrCreateRoom(c.RoomID).register <- c
+}
+
+func (h *Hub) UnregisterClient(c *Client) {
+	if room := h.getRoom(c.RoomID); room != nil {
+		room.unregister <- c
+	}
 }
 
-// BroadcastToRoom sends a message to the broadcast channel
 func (h *Hub) BroadcastToRoom(msg Message) {
-	h.broadcast <- msg
+	h.getOrCreateRoom(msg.RoomID).broadcast <- msg
 }
 
 func (c *Client) ReadPump() {
 	defer func() {
-		c.Hub.unregister <- c
+		c.Hub.UnregisterClient(c)
 		c.Conn.Close()
 	}()
 	c.Conn.SetReadLimit(maxMessageSize)
 	c.Conn.SetReadDeadline(time.Now().Add(pongWait))
-	c.Conn.SetPongHandler(func(string) error { c.Conn.SetReadDeadline(time.Now().Add(pongWait)); return nil })
+	c.Conn.SetPongHandler(func(string) error {
+		c.Conn.SetReadDeadline(time.Now().Add(pongWait))
+		return nil
+	})
 	for {
 		_, message, err := c.Conn.ReadMessage()
 		if err != nil {
@@ -159,7 +243,7 @@ func (c *Client) ReadPump() {
 		if err := json.Unmarshal(message, &msg); err == nil {
 			msg.RoomID = c.RoomID
 			msg.Username = c.Username
-			c.Hub.broadcast <- msg
+			c.Hub.BroadcastToRoom(msg)
 		}
 	}
 }
@@ -182,7 +266,10 @@ func (c *Client) WritePump() {
 			if err != nil {
 				return
 			}
-			w.Write(message)
+			if _, err := w.Write(message); err != nil {
+				_ = w.Close()
+				return
+			}
 			if err := w.Close(); err != nil {
 				return
 			}
@@ -199,23 +286,29 @@ var MainHub *Hub
 
 func InitChat() {
 	MainHub = NewHub()
-	go MainHub.Run()
 }
 
 func (h *Hub) GetStatsSnapshot() StatsSnapshot {
 	h.mutex.RLock()
-	defer h.mutex.RUnlock()
-
+	rooms := make([]*roomHub, 0, len(h.rooms))
 	roomClients := make(map[string]int, len(h.rooms))
+	for roomID, room := range h.rooms {
+		rooms = append(rooms, room)
+		roomClients[roomID] = 0
+	}
+	h.mutex.RUnlock()
+
 	totalClients := 0
-	for roomID, clients := range h.rooms {
-		count := len(clients)
-		roomClients[roomID] = count
+	for _, room := range rooms {
+		room.mutex.RLock()
+		count := len(room.clients)
+		room.mutex.RUnlock()
+		roomClients[room.roomID] = count
 		totalClients += count
 	}
 
 	return StatsSnapshot{
-		RoomCount:            len(h.rooms),
+		RoomCount:            len(rooms),
 		TotalConnectedClient: totalClients,
 		RoomClients:          roomClients,
 	}

backend/internal/db/cache.go

@@ -0,0 +1,332 @@
+package db
+
+import (
+	"errors"
+	"strings"
+	"sync"
+
+	"gorm.io/gorm"
+
+	"hightube/internal/model"
+)
+
+type userCache struct {
+	mutex      sync.RWMutex
+	byID       map[uint]model.User
+	byUsername map[string]uint
+}
+
+type roomCache struct {
+	mutex             sync.RWMutex
+	byID              map[uint]model.Room
+	byUserID          map[uint]uint
+	byStreamKey       map[string]uint
+	activeRoomIDs     map[uint]struct{}
+	activeRoomsLoaded bool
+}
+
+var users = &userCache{
+	byID:       make(map[uint]model.User),
+	byUsername: make(map[string]uint),
+}
+
+var rooms = &roomCache{
+	byID:          make(map[uint]model.Room),
+	byUserID:      make(map[uint]uint),
+	byStreamKey:   make(map[string]uint),
+	activeRoomIDs: make(map[uint]struct{}),
+}
+
+func cacheUser(user model.User) {
+	usernameKey := strings.ToLower(strings.TrimSpace(user.Username))
+
+	users.mutex.Lock()
+	users.byID[user.ID] = user
+	if usernameKey != "" {
+		users.byUsername[usernameKey] = user.ID
+	}
+	users.mutex.Unlock()
+}
+
+func removeUserFromCache(user model.User) {
+	usernameKey := strings.ToLower(strings.TrimSpace(user.Username))
+
+	users.mutex.Lock()
+	delete(users.byID, user.ID)
+	if usernameKey != "" {
+		delete(users.byUsername, usernameKey)
+	}
+	users.mutex.Unlock()
+}
+
+func cacheRoom(room model.Room) {
+	rooms.mutex.Lock()
+	rooms.byID[room.ID] = room
+	rooms.byUserID[room.UserID] = room.ID
+	if room.StreamKey != "" {
+		rooms.byStreamKey[room.StreamKey] = room.ID
+	}
+	if room.IsActive {
+		rooms.activeRoomIDs[room.ID] = struct{}{}
+	} else {
+		delete(rooms.activeRoomIDs, room.ID)
+	}
+	rooms.mutex.Unlock()
+}
+
+func removeRoomFromCache(room model.Room) {
+	rooms.mutex.Lock()
+	delete(rooms.byID, room.ID)
+	delete(rooms.byUserID, room.UserID)
+	if room.StreamKey != "" {
+		delete(rooms.byStreamKey, room.StreamKey)
+	}
+	delete(rooms.activeRoomIDs, room.ID)
+	rooms.mutex.Unlock()
+}
+
+func LoadUserByID(id uint) (model.User, error) {
+	users.mutex.RLock()
+	if user, ok := users.byID[id]; ok {
+		users.mutex.RUnlock()
+		return user, nil
+	}
+	users.mutex.RUnlock()
+
+	var user model.User
+	if err := DB.First(&user, id).Error; err != nil {
+		return model.User{}, err
+	}
+	cacheUser(user)
+	return user, nil
+}
+
+func LoadUserByUsername(username string) (model.User, error) {
+	key := strings.ToLower(strings.TrimSpace(username))
+	if key == "" {
+		return model.User{}, gorm.ErrRecordNotFound
+	}
+
+	users.mutex.RLock()
+	if id, ok := users.byUsername[key]; ok {
+		if user, found := users.byID[id]; found {
+			users.mutex.RUnlock()
+			return user, nil
+		}
+	}
+	users.mutex.RUnlock()
+
+	var user model.User
+	if err := DB.Where("username = ?", strings.TrimSpace(username)).First(&user).Error; err != nil {
+		return model.User{}, err
+	}
+	cacheUser(user)
+	return user, nil
+}
+
+func LoadRoomByUserID(userID uint) (model.Room, error) {
+	rooms.mutex.RLock()
+	if roomID, ok := rooms.byUserID[userID]; ok {
+		if room, found := rooms.byID[roomID]; found {
+			rooms.mutex.RUnlock()
+			return room, nil
+		}
+	}
+	rooms.mutex.RUnlock()
+
+	var room model.Room
+	if err := DB.Where("user_id = ?", userID).First(&room).Error; err != nil {
+		return model.Room{}, err
+	}
+	cacheRoom(room)
+	return room, nil
+}
+
+func LoadRoomByStreamKey(streamKey string) (model.Room, error) {
+	rooms.mutex.RLock()
+	if roomID, ok := rooms.byStreamKey[streamKey]; ok {
+		if room, found := rooms.byID[roomID]; found {
+			rooms.mutex.RUnlock()
+			return room, nil
+		}
+	}
+	rooms.mutex.RUnlock()
+
+	var room model.Room
+	if err := DB.Where("stream_key = ?", streamKey).First(&room).Error; err != nil {
+		return model.Room{}, err
+	}
+	cacheRoom(room)
+	return room, nil
+}
+
+func ListActiveRooms() ([]model.Room, error) {
+	rooms.mutex.RLock()
+	loaded := rooms.activeRoomsLoaded
+	if loaded {
+		result := make([]model.Room, 0, len(rooms.activeRoomIDs))
+		for roomID := range rooms.activeRoomIDs {
+			if room, ok := rooms.byID[roomID]; ok {
+				result = append(result, room)
+			}
+		}
+		complete := len(result) == len(rooms.activeRoomIDs)
+		rooms.mutex.RUnlock()
+		if complete {
+			return result, nil
+		}
+	} else {
+		rooms.mutex.RUnlock()
+	}
+
+	var result []model.Room
+	if err := DB.Where("is_active = ?", true).Find(&result).Error; err != nil {
+		return nil, err
+	}
+
+	rooms.mutex.Lock()
+	for _, room := range result {
+		rooms.byID[room.ID] = room
+		rooms.byUserID[room.UserID] = room.ID
+		if room.StreamKey != "" {
+			rooms.byStreamKey[room.StreamKey] = room.ID
+		}
+		rooms.activeRoomIDs[room.ID] = struct{}{}
+	}
+	rooms.activeRoomsLoaded = true
+	rooms.mutex.Unlock()
+
+	return result, nil
+}
+
+func CreateUserAndRoom(user *model.User, room *model.Room) error {
+	if user == nil || room == nil {
+		return errors.New("user and room are required")
+	}
+
+	if err := DB.Transaction(func(tx *gorm.DB) error {
+		if err := tx.Create(user).Error; err != nil {
+			return err
+		}
+		room.UserID = user.ID
+		if err := tx.Create(room).Error; err != nil {
+			return err
+		}
+		return nil
+	}); err != nil {
+		return err
+	}
+
+	cacheUser(*user)
+	cacheRoom(*room)
+	return nil
+}
+
+func UpdateUserRole(userID uint, role string) error {
+	if err := DB.Model(&model.User{}).Where("id = ?", userID).Update("role", role).Error; err != nil {
+		return err
+	}
+
+	user, err := LoadUserByID(userID)
+	if err != nil {
+		return err
+	}
+	user.Role = role
+	cacheUser(user)
+	return nil
+}
+
+func UpdateUserEnabled(userID uint, enabled bool) error {
+	if err := DB.Model(&model.User{}).Where("id = ?", userID).Update("enabled", enabled).Error; err != nil {
+		return err
+	}
+
+	user, err := LoadUserByID(userID)
+	if err != nil {
+		return err
+	}
+	user.Enabled = enabled
+	cacheUser(user)
+	return nil
+}
+
+func UpdateUserPassword(userID uint, hash string) error {
+	if err := DB.Model(&model.User{}).Where("id = ?", userID).Update("password", hash).Error; err != nil {
+		return err
+	}
+
+	user, err := LoadUserByID(userID)
+	if err != nil {
+		return err
+	}
+	user.Password = hash
+	cacheUser(user)
+	return nil
+}
+
+func SetRoomActive(roomID uint, active bool) error {
+	if err := DB.Model(&model.Room{}).Where("id = ?", roomID).Update("is_active", active).Error; err != nil {
+		return err
+	}
+
+	rooms.mutex.Lock()
+	room, ok := rooms.byID[roomID]
+	if ok {
+		room.IsActive = active
+		rooms.byID[roomID] = room
+		if active {
+			rooms.activeRoomIDs[roomID] = struct{}{}
+		} else {
+			delete(rooms.activeRoomIDs, roomID)
+		}
+		rooms.activeRoomsLoaded = true
+		rooms.mutex.Unlock()
+		return nil
+	}
+	rooms.mutex.Unlock()
+
+	if !active {
+		rooms.mutex.Lock()
+		delete(rooms.activeRoomIDs, roomID)
+		rooms.activeRoomsLoaded = true
+		rooms.mutex.Unlock()
+		return nil
+	}
+
+	var roomFromDB model.Room
+	if err := DB.First(&roomFromDB, roomID).Error; err != nil {
+		return err
+	}
+	roomFromDB.IsActive = active
+	cacheRoom(roomFromDB)
+
+	rooms.mutex.Lock()
+	rooms.activeRoomsLoaded = true
+	rooms.mutex.Unlock()
+	return nil
+}
+
+func DeleteUserCascade(userID uint) error {
+	user, userErr := LoadUserByID(userID)
+	room, roomErr := LoadRoomByUserID(userID)
+
+	if err := DB.Transaction(func(tx *gorm.DB) error {
+		if err := tx.Where("user_id = ?", userID).Delete(&model.Room{}).Error; err != nil {
+			return err
+		}
+		if err := tx.Delete(&model.User{}, userID).Error; err != nil {
+			return err
+		}
+		return nil
+	}); err != nil {
+		return err
+	}
+
+	if roomErr == nil {
+		removeRoomFromCache(room)
+	}
+	if userErr == nil {
+		removeUserFromCache(user)
+	}
+	return nil
+}

backend/internal/db/db.go

@@ -3,6 +3,7 @@ package db
 import (
 	"log"
 	"os"
+	"runtime"
 	"time"
 
 	"gorm.io/driver/sqlite"
@@ -29,14 +30,40 @@ func InitDB() {
 	)
 
 	var err error
-	// Use SQLite database stored in a local file named "hightube.db"
-	DB, err = gorm.Open(sqlite.Open("hightube.db"), &gorm.Config{
+	// Use SQLite database stored in a local file named "hightube.db" with WAL mode and busy timeout enabled
+	DB, err = gorm.Open(sqlite.Open("hightube.db?_journal_mode=WAL&_busy_timeout=5000"), &gorm.Config{
 		Logger: newLogger,
 	})
 	if err != nil {
 		log.Fatalf("Failed to connect database: %v", err)
 	}
 
+	sqlDB, err := DB.DB()
+	if err != nil {
+		log.Fatalf("Failed to get database instance: %v", err)
+	}
+	maxOpen := runtime.NumCPU()*2 + 1
+	if maxOpen < 4 {
+		maxOpen = 4
+	}
+	if maxOpen > 32 {
+		maxOpen = 32
+	}
+	sqlDB.SetMaxOpenConns(maxOpen)
+	sqlDB.SetMaxIdleConns(maxOpen)
+	sqlDB.SetConnMaxIdleTime(10 * time.Minute)
+	sqlDB.SetConnMaxLifetime(time.Hour)
+
+	for _, pragma := range []string{
+		"PRAGMA synchronous=NORMAL",
+		"PRAGMA temp_store=MEMORY",
+		"PRAGMA foreign_keys=ON",
+	} {
+		if execErr := DB.Exec(pragma).Error; execErr != nil {
+			log.Fatalf("Failed to apply %s: %v", pragma, execErr)
+		}
+	}
+
 	// Auto-migrate the schema
 	err = DB.AutoMigrate(&model.User{}, &model.Room{})
 	if err != nil {
@@ -48,7 +75,7 @@ func InitDB() {
 
 	ensureAdminUser()
 
-	monitor.Infof("Database initialized successfully")
+	monitor.Infof("Database initialized successfully with WAL mode and tuned SQLite pragmas")
 }
 
 func ensureAdminUser() {
@@ -68,14 +95,17 @@ func ensureAdminUser() {
 		updates := map[string]interface{}{}
 		if user.Role != "admin" {
 			updates["role"] = "admin"
+			user.Role = "admin"
 		}
 		if !user.Enabled {
 			updates["enabled"] = true
+			user.Enabled = true
 		}
 		if len(updates) > 0 {
 			DB.Model(&user).Updates(updates)
 			monitor.Warnf("Admin account normalized for username=%s", adminUsername)
 		}
+		cacheUser(user)
 		return
 	}
 
@@ -106,5 +136,10 @@ func ensureAdminUser() {
 		monitor.Warnf("Failed to create default admin room: %v", roomErr)
 	}
 
+	cacheUser(newAdmin)
+	if room.ID != 0 {
+		cacheRoom(room)
+	}
+
 	monitor.Warnf("Default admin created for username=%s; change the password after first login", adminUsername)
 }

backend/internal/model/room.go

@@ -10,5 +10,5 @@ type Room struct {
 	UserID    uint   `gorm:"uniqueIndex;not null"`
 	Title     string `gorm:"default:'My Live Room'"`
 	StreamKey string `gorm:"uniqueIndex;not null"` // Secret key for OBS streaming
-	IsActive  bool   `gorm:"default:false"`        // Whether the stream is currently active
+	IsActive  bool   `gorm:"index;default:false"`  // Whether the stream is currently active
 }

backend/internal/monitor/metrics.go

@@ -2,6 +2,7 @@ package monitor
 
 import (
 	"runtime"
+	"sync"
 	"sync/atomic"
 	"time"
 )
@@ -23,21 +24,32 @@ type Snapshot struct {
 	ErrorsTotal   uint64  `json:"errors_total"`
 }
 
-func IncrementRequestCount() {
-	atomic.AddUint64(&totalRequests, 1)
+var (
+	cachedSnapshot Snapshot
+	snapshotMutex  sync.RWMutex
+)
+
+func init() {
+	// Initialize the snapshot once on startup
+	updateSnapshot()
+
+	// Update the snapshot in the background every 2 seconds to avoid STW runtime.ReadMemStats in request threads
+	go func() {
+		ticker := time.NewTicker(2 * time.Second)
+		for range ticker.C {
+			updateSnapshot()
+		}
+	}()
 }
 
-func IncrementErrorCount() {
-	atomic.AddUint64(&totalErrors, 1)
-}
-
-func GetSnapshot() Snapshot {
+func updateSnapshot() {
 	var mem runtime.MemStats
 	runtime.ReadMemStats(&mem)
 
 	diskTotal, diskFree := getDiskSpaceGB()
 
-	return Snapshot{
+	snapshotMutex.Lock()
+	cachedSnapshot = Snapshot{
 		UptimeSeconds: int64(time.Since(startedAt).Seconds()),
 		Goroutines:    runtime.NumGoroutine(),
 		MemoryAllocMB: bytesToMB(mem.Alloc),
@@ -48,6 +60,28 @@ func GetSnapshot() Snapshot {
 		RequestsTotal: atomic.LoadUint64(&totalRequests),
 		ErrorsTotal:   atomic.LoadUint64(&totalErrors),
 	}
+	snapshotMutex.Unlock()
+}
+
+func IncrementRequestCount() {
+	atomic.AddUint64(&totalRequests, 1)
+}
+
+func IncrementErrorCount() {
+	atomic.AddUint64(&totalErrors, 1)
+}
+
+func GetSnapshot() Snapshot {
+	snapshotMutex.RLock()
+	defer snapshotMutex.RUnlock()
+
+	// Return the cached snapshot, overlaying volatile/cheap fields in real-time
+	s := cachedSnapshot
+	s.UptimeSeconds = int64(time.Since(startedAt).Seconds())
+	s.Goroutines = runtime.NumGoroutine()
+	s.RequestsTotal = atomic.LoadUint64(&totalRequests)
+	s.ErrorsTotal = atomic.LoadUint64(&totalErrors)
+	return s
 }
 
 func bytesToMB(v uint64) float64 {

backend/internal/stream/server.go

@@ -1,18 +1,22 @@
 package stream
 
 import (
+	"bufio"
 	"context"
 	"crypto/rand"
 	"encoding/hex"
 	"fmt"
 	"io"
 	"net/http"
+	"os"
 	"os/exec"
+	"path/filepath"
 	"strings"
 	"sync"
 	"time"
 
 	"github.com/gin-gonic/gin"
+	"github.com/nareix/joy4/av"
 	"github.com/nareix/joy4/av/avutil"
 	"github.com/nareix/joy4/av/pubsub"
 	"github.com/nareix/joy4/format"
@@ -21,7 +25,6 @@ import (
 
 	"hightube/internal/chat"
 	"hightube/internal/db"
-	"hightube/internal/model"
 	"hightube/internal/monitor"
 )
 
@@ -35,7 +38,10 @@ type RTMPServer struct {
 	server             *rtmp.Server
 	channels           map[string]*pubsub.Queue
 	transcoders        map[string][]*variantTranscoder
+	thumbnailJobs      map[string]context.CancelFunc
 	internalPublishKey string
+	rtmpPort           string
+	thumbnailDir       string
 	mutex              sync.RWMutex
 }
 
@@ -53,6 +59,8 @@ type qualityProfile struct {
 
 var qualityOrder = []string{"source", "720p", "480p"}
 
+const thumbnailCaptureInterval = 12 * time.Second
+
 var supportedQualities = map[string]qualityProfile{
 	"720p": {
 		scale:        "1280:-2",
@@ -76,12 +84,32 @@ func (w writeFlusher) Flush() error {
 	return nil
 }
 
-// NewRTMPServer creates and initializes a new media server
-func NewRTMPServer() *RTMPServer {
+type bufferedWriteFlusher struct {
+	bufw        *bufio.Writer
+	httpFlusher http.Flusher
+}
+
+func (w *bufferedWriteFlusher) Write(p []byte) (n int, err error) {
+	return w.bufw.Write(p)
+}
+
+func (w *bufferedWriteFlusher) Flush() error {
+	if err := w.bufw.Flush(); err != nil {
+		return err
+	}
+	w.httpFlusher.Flush()
+	return nil
+}
+
+// NewRTMPServer creates and initializes a new media server.
+func NewRTMPServer(rtmpPort string) *RTMPServer {
 	s := &RTMPServer{
 		channels:           make(map[string]*pubsub.Queue),
 		transcoders:        make(map[string][]*variantTranscoder),
+		thumbnailJobs:      make(map[string]context.CancelFunc),
 		internalPublishKey: generateInternalPublishKey(),
+		rtmpPort:           rtmpPort,
+		thumbnailDir:       filepath.Join(os.TempDir(), "hightube-thumbnails"),
 		server:             &rtmp.Server{},
 	}
 
@@ -120,9 +148,12 @@ func NewRTMPServer() *RTMPServer {
 		if isSource {
 			roomIDUint := parseRoomID(roomID)
 			if roomIDUint != 0 {
-				db.DB.Model(&model.Room{}).Where("id = ?", roomIDUint).Updates(map[string]interface{}{"is_active": true})
+				if err := db.SetRoomActive(roomIDUint, true); err != nil {
+					monitor.Warnf("Failed to mark room active room_id=%s: %v", roomID, err)
+				}
 			}
 			s.startVariantTranscoders(roomID)
+			s.startThumbnailCapture(roomID)
 		}
 
 		// 3. Cleanup on end
@@ -134,9 +165,12 @@ func NewRTMPServer() *RTMPServer {
 
 			if isSource {
 				s.stopVariantTranscoders(roomID)
+				s.stopThumbnailCapture(roomID)
 				roomIDUint := parseRoomID(roomID)
 				if roomIDUint != 0 {
-					db.DB.Model(&model.Room{}).Where("id = ?", roomIDUint).Updates(map[string]interface{}{"is_active": false})
+					if err := db.SetRoomActive(roomIDUint, false); err != nil {
+						monitor.Warnf("Failed to mark room inactive room_id=%s: %v", roomID, err)
+					}
 				}
 				chat.MainHub.ClearRoomHistory(roomID)
 				monitor.Infof("Publishing ended for room_id=%s", roomID)
@@ -225,13 +259,47 @@ func (s *RTMPServer) HandleHTTPFLV(c *gin.Context) {
 	c.Status(http.StatusOK)
 	flusher.Flush()
 
-	muxer := flv.NewMuxerWriteFlusher(writeFlusher{
+	// Coalesce the 3 internal write calls of WriteTag using a 4KB bufio.Writer
+	bufWriter := bufio.NewWriterSize(c.Writer, 4096)
+	bwf := &bufferedWriteFlusher{
+		bufw:        bufWriter,
 		httpFlusher: flusher,
-		Writer:      c.Writer,
-	})
+	}
+
+	muxer := flv.NewMuxerWriteFlusher(bwf)
 	cursor := q.Latest()
 
-	if err := avutil.CopyFile(muxer, cursor); err != nil && err != io.EOF {
+	// Write header first
+	streams, err := cursor.Streams()
+	if err != nil {
+		monitor.Errorf("HTTP-FLV failed to get cursor streams: %v", err)
+		return
+	}
+	if err = muxer.WriteHeader(streams); err != nil {
+		monitor.Errorf("HTTP-FLV failed to write header: %v", err)
+		return
+	}
+	if err = bwf.Flush(); err != nil {
+		return
+	}
+
+	// Read and write packet loop with per-packet flushing for low latency
+	for {
+		var pkt av.Packet
+		pkt, err = cursor.ReadPacket()
+		if err != nil {
+			break
+		}
+		if err = muxer.WritePacket(pkt); err != nil {
+			break
+		}
+		// Flush immediately so the frame is sent to the client (grouped write syscall)
+		if err = bwf.Flush(); err != nil {
+			break
+		}
+	}
+
+	if err != nil && err != io.EOF {
 		errStr := err.Error()
 		if strings.Contains(errStr, "broken pipe") || strings.Contains(errStr, "connection reset by peer") {
 			monitor.Infof("HTTP-FLV viewer disconnected: %s", streamPath)
@@ -241,10 +309,21 @@ func (s *RTMPServer) HandleHTTPFLV(c *gin.Context) {
 	}
 }
 
+func (s *RTMPServer) HandleThumbnail(c *gin.Context) {
+	thumbnailPath := s.thumbnailPath(c.Param("room_id"))
+	if _, err := os.Stat(thumbnailPath); err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "Thumbnail not found"})
+		return
+	}
+
+	c.Header("Cache-Control", "no-store, no-cache, must-revalidate")
+	c.File(thumbnailPath)
+}
+
 func (s *RTMPServer) resolvePublishPath(parts []string) (roomID string, channelPath string, isSource bool, ok bool) {
 	if parts[1] == "live" && len(parts) == 3 {
-		var room model.Room
-		if err := db.DB.Where("stream_key = ?", parts[2]).First(&room).Error; err != nil {
+		room, err := db.LoadRoomByStreamKey(parts[2])
+		if err != nil {
 			return "", "", false, false
 		}
 		roomID = fmt.Sprintf("%d", room.ID)
@@ -271,17 +350,18 @@ func (s *RTMPServer) startVariantTranscoders(roomID string) {
 	launch := make([]*variantTranscoder, 0, len(supportedQualities))
 	for quality, profile := range supportedQualities {
 		ctx, cancel := context.WithCancel(context.Background())
-		inputURL := fmt.Sprintf("rtmp://127.0.0.1:1935/live/%s", roomID)
-		outputURL := fmt.Sprintf("rtmp://127.0.0.1:1935/variant/%s/%s/%s", roomID, quality, s.internalPublishKey)
+		inputURL := fmt.Sprintf("rtmp://127.0.0.1:%s/live/%s", s.rtmpPort, roomID)
+		outputURL := fmt.Sprintf("rtmp://127.0.0.1:%s/variant/%s/%s/%s", s.rtmpPort, roomID, quality, s.internalPublishKey)
 		cmd := exec.CommandContext(
 			ctx,
 			"ffmpeg",
 			"-nostdin",
 			"-loglevel", "error",
+			"-fflags", "nobuffer",
 			"-i", inputURL,
 			"-vf", "scale="+profile.scale+":force_original_aspect_ratio=decrease",
 			"-c:v", "libx264",
-			"-preset", "veryfast",
+			"-preset", "ultrafast",
 			"-tune", "zerolatency",
 			"-g", "48",
 			"-keyint_min", "48",
@@ -333,6 +413,95 @@ func (s *RTMPServer) stopVariantTranscoders(roomID string) {
 	}
 }
 
+func (s *RTMPServer) startThumbnailCapture(roomID string) {
+	s.stopThumbnailCapture(roomID)
+
+	if err := os.MkdirAll(s.thumbnailDir, 0o755); err != nil {
+		monitor.Errorf("Failed to create thumbnail directory: %v", err)
+		return
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+
+	s.mutex.Lock()
+	s.thumbnailJobs[roomID] = cancel
+	s.mutex.Unlock()
+
+	go func() {
+		select {
+		case <-ctx.Done():
+			return
+		case <-time.After(3 * time.Second):
+		}
+
+		s.captureThumbnail(roomID)
+
+		ticker := time.NewTicker(thumbnailCaptureInterval)
+		defer ticker.Stop()
+
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case <-ticker.C:
+				s.captureThumbnail(roomID)
+			}
+		}
+	}()
+}
+
+func (s *RTMPServer) stopThumbnailCapture(roomID string) {
+	s.mutex.Lock()
+	cancel := s.thumbnailJobs[roomID]
+	delete(s.thumbnailJobs, roomID)
+	s.mutex.Unlock()
+
+	if cancel != nil {
+		cancel()
+	}
+
+	_ = os.Remove(s.thumbnailPath(roomID))
+}
+
+func (s *RTMPServer) captureThumbnail(roomID string) {
+	outputPath := s.thumbnailPath(roomID)
+	tempPath := outputPath + ".tmp.jpg"
+	defer os.Remove(tempPath)
+
+	ctx, cancel := context.WithTimeout(context.Background(), 8*time.Second)
+	defer cancel()
+
+	cmd := exec.CommandContext(
+		ctx,
+		"ffmpeg",
+		"-y",
+		"-loglevel", "error",
+		"-rtmp_live", "live",
+		"-i", fmt.Sprintf("rtmp://127.0.0.1:%s/live/%s", s.rtmpPort, roomID),
+		"-frames:v", "1",
+		"-q:v", "4",
+		tempPath,
+	)
+
+	if err := cmd.Run(); err != nil {
+		if ctx.Err() == context.DeadlineExceeded {
+			monitor.Warnf("Thumbnail capture timed out for room_id=%s", roomID)
+			return
+		}
+		monitor.Warnf("Thumbnail capture failed for room_id=%s: %v", roomID, err)
+		return
+	}
+
+	_ = os.Remove(outputPath)
+	if err := os.Rename(tempPath, outputPath); err != nil {
+		monitor.Warnf("Failed to store thumbnail for room_id=%s: %v", roomID, err)
+	}
+}
+
+func (s *RTMPServer) thumbnailPath(roomID string) string {
+	return filepath.Join(s.thumbnailDir, fmt.Sprintf("%s.jpg", roomID))
+}
+
 func normalizeQuality(value string) string {
 	value = strings.ToLower(strings.TrimSpace(value))
 	if _, ok := supportedQualities[value]; ok {

frontend/android/app/build.gradle.kts

@@ -11,12 +11,12 @@ android {
     ndkVersion = flutter.ndkVersion
 
     compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_1_8
-        targetCompatibility = JavaVersion.VERSION_1_8
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
     }
 
     kotlinOptions {
-        jvmTarget = JavaVersion.VERSION_1_8.toString()
+        jvmTarget = JavaVersion.VERSION_17.toString()
     }
 
     defaultConfig {

frontend/android/app/src/main/AndroidManifest.xml

@@ -1,5 +1,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
     <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.CAMERA" />
+    <uses-permission android:name="android.permission.RECORD_AUDIO" />
     <application
         android:label="Hightube"
         android:name="${applicationName}"

frontend/l10n.yaml

@@ -0,0 +1,3 @@
+arb-dir: lib/l10n
+template-arb-file: app_en.arb
+output-localization-file: app_localizations.dart

frontend/lib/l10n/app_en.arb

@@ -0,0 +1,70 @@
+{
+  "@@locale": "en",
+  "settings": "Settings",
+  "networkConfiguration": "Network Configuration",
+  "backendServerUrl": "Backend Server URL",
+  "saveNetworkSettings": "Save Network Settings",
+  "serverUrlUpdated": "Server URL Updated",
+  "themeCustomization": "Theme Customization",
+  "appearanceMode": "Appearance Mode",
+  "system": "System",
+  "light": "Light",
+  "dark": "Dark",
+  "accentColor": "Accent Color",
+  "explore": "Explore",
+  "livePreviewThumbnails": "Live Preview Thumbnails",
+  "livePreviewThumbnailsDesc": "Show cached snapshot covers for live rooms when available.",
+  "security": "Security",
+  "oldPassword": "Old Password",
+  "newPassword": "New Password",
+  "changePassword": "Change Password",
+  "logout": "Logout",
+  "confirmLogout": "Confirm Logout",
+  "confirmLogoutDesc": "Are you sure you want to log out now?",
+  "cancel": "Cancel",
+  "language": "Language",
+  "selectLanguage": "Select Language",
+  "english": "English",
+  "simplifiedChinese": "简体中文",
+  "traditionalChinese": "繁體中文",
+  "japanese": "日本語",
+  "console": "Console",
+  "failedToLoadRooms": "Failed to load rooms",
+  "goLive": "Go Live",
+  "noActiveRooms": "No active rooms. Be the first!",
+  "hostId": "Host ID",
+  "username": "Username",
+  "password": "Password",
+  "fillAllFields": "Please fill in all fields",
+  "networkError": "Network Error: Could not connect to server",
+  "loginFailed": "Login Failed",
+  "login": "LOGIN",
+  "dontHaveAccount": "Don't have an account? Create one",
+  "createAccount": "Create Account",
+  "joinHightube": "Join Hightube",
+  "desiredUsername": "Desired Username",
+  "register": "REGISTER",
+  "alreadyHaveAccount": "Already have an account? Login here",
+  "accountCreated": "Account created! Please login.",
+  "playbackResolution": "Playback Resolution",
+  "availableNow": "Available now",
+  "waitingForTranscoding": "Waiting for backend transcoding output",
+  "sendMessage": "Send a message...",
+  "liveChat": "Live Chat",
+  "refresh": "Refresh",
+  "volume": "Volume",
+  "danmakuOn": "Danmaku On",
+  "danmakuOff": "Danmaku Off",
+  "fullscreen": "Fullscreen",
+  "exitFullscreen": "Exit Fullscreen",
+  "resolution": "Resolution",
+  "playbackOptionsDesc": "Select an available transcoded stream.",
+  "sourceOnlyDesc": "Only the source stream is available right now.",
+  "myStreamConsole": "My Stream Console",
+  "noRoomInfo": "No room info found.",
+  "roomTitle": "Room Title",
+  "rtmpServerUrl": "RTMP Server URL",
+  "streamKey": "Stream Key (Keep Secret!)",
+  "copiedToClipboard": "Copied to clipboard",
+  "failedToFetchRoomInfo": "Failed to fetch room info"
+}

frontend/lib/l10n/app_ja.arb

@@ -0,0 +1,70 @@
+{
+  "@@locale": "ja",
+  "settings": "設定",
+  "networkConfiguration": "ネットワーク設定",
+  "backendServerUrl": "バックエンドサーバーURL",
+  "saveNetworkSettings": "ネットワーク設定を保存",
+  "serverUrlUpdated": "サーバーURLが更新されました",
+  "themeCustomization": "テーマのカスタマイズ",
+  "appearanceMode": "外観モード",
+  "system": "システム",
+  "light": "ライト",
+  "dark": "ダーク",
+  "accentColor": "アクセントカラー",
+  "explore": "探索",
+  "livePreviewThumbnails": "ライブプレビューサムネイル",
+  "livePreviewThumbnailsDesc": "利用可能な場合、ライブルームのキャッシュされたスナップショットカバーを表示します。",
+  "security": "セキュリティ",
+  "oldPassword": "現在のパスワード",
+  "newPassword": "新しいパスワード",
+  "changePassword": "パスワードを変更",
+  "logout": "ログアウト",
+  "confirmLogout": "ログアウトの確認",
+  "confirmLogoutDesc": "今すぐログアウトしてもよろしいですか？",
+  "cancel": "キャンセル",
+  "language": "言語",
+  "selectLanguage": "言語を選択",
+  "english": "English",
+  "simplifiedChinese": "简体中文",
+  "traditionalChinese": "繁體中文",
+  "japanese": "日本語",
+  "console": "コンソール",
+  "failedToLoadRooms": "ルームの読み込みに失敗しました",
+  "goLive": "ライブ配信を開始",
+  "noActiveRooms": "配信中のルームはありません。最初の配信者になりましょう！",
+  "hostId": "配信者 ID",
+  "username": "ユーザー名",
+  "password": "パスワード",
+  "fillAllFields": "すべての項目を入力してください",
+  "networkError": "ネットワークエラー：サーバーに接続できませんでした",
+  "loginFailed": "ログインに失敗しました",
+  "login": "ログイン",
+  "dontHaveAccount": "アカウントをお持ちでないですか？新規登録",
+  "createAccount": "アカウント作成",
+  "joinHightube": "Hightube に参加",
+  "desiredUsername": "ユーザー名",
+  "register": "登録",
+  "alreadyHaveAccount": "既にアカウントをお持ちですか？ログイン",
+  "accountCreated": "アカウントが作成されました！ログインしてください。",
+  "playbackResolution": "再生解像度",
+  "availableNow": "利用可能",
+  "waitingForTranscoding": "バックエンドのトランスコード出力を待機中",
+  "sendMessage": "メッセージを送信...",
+  "liveChat": "ライブチャット",
+  "refresh": "更新",
+  "volume": "音量",
+  "danmakuOn": "弾幕オン",
+  "danmakuOff": "弾幕オフ",
+  "fullscreen": "全画面",
+  "exitFullscreen": "全画面終了",
+  "resolution": "解像度",
+  "playbackOptionsDesc": "利用可能なトランスコード済みストリームを選択します。",
+  "sourceOnlyDesc": "現在、ソースストリームのみが利用可能です。",
+  "myStreamConsole": "配信コンソール",
+  "noRoomInfo": "ルーム情報が見つかりません。",
+  "roomTitle": "ルームタイトル",
+  "rtmpServerUrl": "RTMP サーバー URL",
+  "streamKey": "ストリームキー (秘密にしてください!)",
+  "copiedToClipboard": "クリップボードにコピーしました",
+  "failedToFetchRoomInfo": "ルーム情報の取得に失敗しました"
+}

frontend/lib/l10n/app_localizations.dart

@@ -0,0 +1,553 @@
+import 'dart:async';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
+import 'package:intl/intl.dart' as intl;
+
+import 'app_localizations_en.dart';
+import 'app_localizations_ja.dart';
+import 'app_localizations_zh.dart';
+
+// ignore_for_file: type=lint
+
+/// Callers can lookup localized strings with an instance of AppLocalizations
+/// returned by `AppLocalizations.of(context)`.
+///
+/// Applications need to include `AppLocalizations.delegate()` in their app's
+/// `localizationDelegates` list, and the locales they support in the app's
+/// `supportedLocales` list. For example:
+///
+/// ```dart
+/// import 'l10n/app_localizations.dart';
+///
+/// return MaterialApp(
+///   localizationsDelegates: AppLocalizations.localizationsDelegates,
+///   supportedLocales: AppLocalizations.supportedLocales,
+///   home: MyApplicationHome(),
+/// );
+/// ```
+///
+/// ## Update pubspec.yaml
+///
+/// Please make sure to update your pubspec.yaml to include the following
+/// packages:
+///
+/// ```yaml
+/// dependencies:
+///   # Internationalization support.
+///   flutter_localizations:
+///     sdk: flutter
+///   intl: any # Use the pinned version from flutter_localizations
+///
+///   # Rest of dependencies
+/// ```
+///
+/// ## iOS Applications
+///
+/// iOS applications define key application metadata, including supported
+/// locales, in an Info.plist file that is built into the application bundle.
+/// To configure the locales supported by your app, you’ll need to edit this
+/// file.
+///
+/// First, open your project’s ios/Runner.xcworkspace Xcode workspace file.
+/// Then, in the Project Navigator, open the Info.plist file under the Runner
+/// project’s Runner folder.
+///
+/// Next, select the Information Property List item, select Add Item from the
+/// Editor menu, then select Localizations from the pop-up menu.
+///
+/// Select and expand the newly-created Localizations item then, for each
+/// locale your application supports, add a new item and select the locale
+/// you wish to add from the pop-up menu in the Value field. This list should
+/// be consistent with the languages listed in the AppLocalizations.supportedLocales
+/// property.
+abstract class AppLocalizations {
+  AppLocalizations(String locale)
+    : localeName = intl.Intl.canonicalizedLocale(locale.toString());
+
+  final String localeName;
+
+  static AppLocalizations? of(BuildContext context) {
+    return Localizations.of<AppLocalizations>(context, AppLocalizations);
+  }
+
+  static const LocalizationsDelegate<AppLocalizations> delegate =
+      _AppLocalizationsDelegate();
+
+  /// A list of this localizations delegate along with the default localizations
+  /// delegates.
+  ///
+  /// Returns a list of localizations delegates containing this delegate along with
+  /// GlobalMaterialLocalizations.delegate, GlobalCupertinoLocalizations.delegate,
+  /// and GlobalWidgetsLocalizations.delegate.
+  ///
+  /// Additional delegates can be added by appending to this list in
+  /// MaterialApp. This list does not have to be used at all if a custom list
+  /// of delegates is preferred or required.
+  static const List<LocalizationsDelegate<dynamic>> localizationsDelegates =
+      <LocalizationsDelegate<dynamic>>[
+        delegate,
+        GlobalMaterialLocalizations.delegate,
+        GlobalCupertinoLocalizations.delegate,
+        GlobalWidgetsLocalizations.delegate,
+      ];
+
+  /// A list of this localizations delegate's supported locales.
+  static const List<Locale> supportedLocales = <Locale>[
+    Locale('en'),
+    Locale('ja'),
+    Locale('zh'),
+    Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hant'),
+  ];
+
+  /// No description provided for @settings.
+  ///
+  /// In en, this message translates to:
+  /// **'Settings'**
+  String get settings;
+
+  /// No description provided for @networkConfiguration.
+  ///
+  /// In en, this message translates to:
+  /// **'Network Configuration'**
+  String get networkConfiguration;
+
+  /// No description provided for @backendServerUrl.
+  ///
+  /// In en, this message translates to:
+  /// **'Backend Server URL'**
+  String get backendServerUrl;
+
+  /// No description provided for @saveNetworkSettings.
+  ///
+  /// In en, this message translates to:
+  /// **'Save Network Settings'**
+  String get saveNetworkSettings;
+
+  /// No description provided for @serverUrlUpdated.
+  ///
+  /// In en, this message translates to:
+  /// **'Server URL Updated'**
+  String get serverUrlUpdated;
+
+  /// No description provided for @themeCustomization.
+  ///
+  /// In en, this message translates to:
+  /// **'Theme Customization'**
+  String get themeCustomization;
+
+  /// No description provided for @appearanceMode.
+  ///
+  /// In en, this message translates to:
+  /// **'Appearance Mode'**
+  String get appearanceMode;
+
+  /// No description provided for @system.
+  ///
+  /// In en, this message translates to:
+  /// **'System'**
+  String get system;
+
+  /// No description provided for @light.
+  ///
+  /// In en, this message translates to:
+  /// **'Light'**
+  String get light;
+
+  /// No description provided for @dark.
+  ///
+  /// In en, this message translates to:
+  /// **'Dark'**
+  String get dark;
+
+  /// No description provided for @accentColor.
+  ///
+  /// In en, this message translates to:
+  /// **'Accent Color'**
+  String get accentColor;
+
+  /// No description provided for @explore.
+  ///
+  /// In en, this message translates to:
+  /// **'Explore'**
+  String get explore;
+
+  /// No description provided for @livePreviewThumbnails.
+  ///
+  /// In en, this message translates to:
+  /// **'Live Preview Thumbnails'**
+  String get livePreviewThumbnails;
+
+  /// No description provided for @livePreviewThumbnailsDesc.
+  ///
+  /// In en, this message translates to:
+  /// **'Show cached snapshot covers for live rooms when available.'**
+  String get livePreviewThumbnailsDesc;
+
+  /// No description provided for @security.
+  ///
+  /// In en, this message translates to:
+  /// **'Security'**
+  String get security;
+
+  /// No description provided for @oldPassword.
+  ///
+  /// In en, this message translates to:
+  /// **'Old Password'**
+  String get oldPassword;
+
+  /// No description provided for @newPassword.
+  ///
+  /// In en, this message translates to:
+  /// **'New Password'**
+  String get newPassword;
+
+  /// No description provided for @changePassword.
+  ///
+  /// In en, this message translates to:
+  /// **'Change Password'**
+  String get changePassword;
+
+  /// No description provided for @logout.
+  ///
+  /// In en, this message translates to:
+  /// **'Logout'**
+  String get logout;
+
+  /// No description provided for @confirmLogout.
+  ///
+  /// In en, this message translates to:
+  /// **'Confirm Logout'**
+  String get confirmLogout;
+
+  /// No description provided for @confirmLogoutDesc.
+  ///
+  /// In en, this message translates to:
+  /// **'Are you sure you want to log out now?'**
+  String get confirmLogoutDesc;
+
+  /// No description provided for @cancel.
+  ///
+  /// In en, this message translates to:
+  /// **'Cancel'**
+  String get cancel;
+
+  /// No description provided for @language.
+  ///
+  /// In en, this message translates to:
+  /// **'Language'**
+  String get language;
+
+  /// No description provided for @selectLanguage.
+  ///
+  /// In en, this message translates to:
+  /// **'Select Language'**
+  String get selectLanguage;
+
+  /// No description provided for @english.
+  ///
+  /// In en, this message translates to:
+  /// **'English'**
+  String get english;
+
+  /// No description provided for @simplifiedChinese.
+  ///
+  /// In en, this message translates to:
+  /// **'简体中文'**
+  String get simplifiedChinese;
+
+  /// No description provided for @traditionalChinese.
+  ///
+  /// In en, this message translates to:
+  /// **'繁體中文'**
+  String get traditionalChinese;
+
+  /// No description provided for @japanese.
+  ///
+  /// In en, this message translates to:
+  /// **'日本語'**
+  String get japanese;
+
+  /// No description provided for @console.
+  ///
+  /// In en, this message translates to:
+  /// **'Console'**
+  String get console;
+
+  /// No description provided for @failedToLoadRooms.
+  ///
+  /// In en, this message translates to:
+  /// **'Failed to load rooms'**
+  String get failedToLoadRooms;
+
+  /// No description provided for @goLive.
+  ///
+  /// In en, this message translates to:
+  /// **'Go Live'**
+  String get goLive;
+
+  /// No description provided for @noActiveRooms.
+  ///
+  /// In en, this message translates to:
+  /// **'No active rooms. Be the first!'**
+  String get noActiveRooms;
+
+  /// No description provided for @hostId.
+  ///
+  /// In en, this message translates to:
+  /// **'Host ID'**
+  String get hostId;
+
+  /// No description provided for @username.
+  ///
+  /// In en, this message translates to:
+  /// **'Username'**
+  String get username;
+
+  /// No description provided for @password.
+  ///
+  /// In en, this message translates to:
+  /// **'Password'**
+  String get password;
+
+  /// No description provided for @fillAllFields.
+  ///
+  /// In en, this message translates to:
+  /// **'Please fill in all fields'**
+  String get fillAllFields;
+
+  /// No description provided for @networkError.
+  ///
+  /// In en, this message translates to:
+  /// **'Network Error: Could not connect to server'**
+  String get networkError;
+
+  /// No description provided for @loginFailed.
+  ///
+  /// In en, this message translates to:
+  /// **'Login Failed'**
+  String get loginFailed;
+
+  /// No description provided for @login.
+  ///
+  /// In en, this message translates to:
+  /// **'LOGIN'**
+  String get login;
+
+  /// No description provided for @dontHaveAccount.
+  ///
+  /// In en, this message translates to:
+  /// **'Don\'t have an account? Create one'**
+  String get dontHaveAccount;
+
+  /// No description provided for @createAccount.
+  ///
+  /// In en, this message translates to:
+  /// **'Create Account'**
+  String get createAccount;
+
+  /// No description provided for @joinHightube.
+  ///
+  /// In en, this message translates to:
+  /// **'Join Hightube'**
+  String get joinHightube;
+
+  /// No description provided for @desiredUsername.
+  ///
+  /// In en, this message translates to:
+  /// **'Desired Username'**
+  String get desiredUsername;
+
+  /// No description provided for @register.
+  ///
+  /// In en, this message translates to:
+  /// **'REGISTER'**
+  String get register;
+
+  /// No description provided for @alreadyHaveAccount.
+  ///
+  /// In en, this message translates to:
+  /// **'Already have an account? Login here'**
+  String get alreadyHaveAccount;
+
+  /// No description provided for @accountCreated.
+  ///
+  /// In en, this message translates to:
+  /// **'Account created! Please login.'**
+  String get accountCreated;
+
+  /// No description provided for @playbackResolution.
+  ///
+  /// In en, this message translates to:
+  /// **'Playback Resolution'**
+  String get playbackResolution;
+
+  /// No description provided for @availableNow.
+  ///
+  /// In en, this message translates to:
+  /// **'Available now'**
+  String get availableNow;
+
+  /// No description provided for @waitingForTranscoding.
+  ///
+  /// In en, this message translates to:
+  /// **'Waiting for backend transcoding output'**
+  String get waitingForTranscoding;
+
+  /// No description provided for @sendMessage.
+  ///
+  /// In en, this message translates to:
+  /// **'Send a message...'**
+  String get sendMessage;
+
+  /// No description provided for @liveChat.
+  ///
+  /// In en, this message translates to:
+  /// **'Live Chat'**
+  String get liveChat;
+
+  /// No description provided for @refresh.
+  ///
+  /// In en, this message translates to:
+  /// **'Refresh'**
+  String get refresh;
+
+  /// No description provided for @volume.
+  ///
+  /// In en, this message translates to:
+  /// **'Volume'**
+  String get volume;
+
+  /// No description provided for @danmakuOn.
+  ///
+  /// In en, this message translates to:
+  /// **'Danmaku On'**
+  String get danmakuOn;
+
+  /// No description provided for @danmakuOff.
+  ///
+  /// In en, this message translates to:
+  /// **'Danmaku Off'**
+  String get danmakuOff;
+
+  /// No description provided for @fullscreen.
+  ///
+  /// In en, this message translates to:
+  /// **'Fullscreen'**
+  String get fullscreen;
+
+  /// No description provided for @exitFullscreen.
+  ///
+  /// In en, this message translates to:
+  /// **'Exit Fullscreen'**
+  String get exitFullscreen;
+
+  /// No description provided for @resolution.
+  ///
+  /// In en, this message translates to:
+  /// **'Resolution'**
+  String get resolution;
+
+  /// No description provided for @playbackOptionsDesc.
+  ///
+  /// In en, this message translates to:
+  /// **'Select an available transcoded stream.'**
+  String get playbackOptionsDesc;
+
+  /// No description provided for @sourceOnlyDesc.
+  ///
+  /// In en, this message translates to:
+  /// **'Only the source stream is available right now.'**
+  String get sourceOnlyDesc;
+
+  /// No description provided for @myStreamConsole.
+  ///
+  /// In en, this message translates to:
+  /// **'My Stream Console'**
+  String get myStreamConsole;
+
+  /// No description provided for @noRoomInfo.
+  ///
+  /// In en, this message translates to:
+  /// **'No room info found.'**
+  String get noRoomInfo;
+
+  /// No description provided for @roomTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'Room Title'**
+  String get roomTitle;
+
+  /// No description provided for @rtmpServerUrl.
+  ///
+  /// In en, this message translates to:
+  /// **'RTMP Server URL'**
+  String get rtmpServerUrl;
+
+  /// No description provided for @streamKey.
+  ///
+  /// In en, this message translates to:
+  /// **'Stream Key (Keep Secret!)'**
+  String get streamKey;
+
+  /// No description provided for @copiedToClipboard.
+  ///
+  /// In en, this message translates to:
+  /// **'Copied to clipboard'**
+  String get copiedToClipboard;
+
+  /// No description provided for @failedToFetchRoomInfo.
+  ///
+  /// In en, this message translates to:
+  /// **'Failed to fetch room info'**
+  String get failedToFetchRoomInfo;
+}
+
+class _AppLocalizationsDelegate
+    extends LocalizationsDelegate<AppLocalizations> {
+  const _AppLocalizationsDelegate();
+
+  @override
+  Future<AppLocalizations> load(Locale locale) {
+    return SynchronousFuture<AppLocalizations>(lookupAppLocalizations(locale));
+  }
+
+  @override
+  bool isSupported(Locale locale) =>
+      <String>['en', 'ja', 'zh'].contains(locale.languageCode);
+
+  @override
+  bool shouldReload(_AppLocalizationsDelegate old) => false;
+}
+
+AppLocalizations lookupAppLocalizations(Locale locale) {
+  // Lookup logic when language+script codes are specified.
+  switch (locale.languageCode) {
+    case 'zh':
+      {
+        switch (locale.scriptCode) {
+          case 'Hant':
+            return AppLocalizationsZhHant();
+        }
+        break;
+      }
+  }
+
+  // Lookup logic when only language code is specified.
+  switch (locale.languageCode) {
+    case 'en':
+      return AppLocalizationsEn();
+    case 'ja':
+      return AppLocalizationsJa();
+    case 'zh':
+      return AppLocalizationsZh();
+  }
+
+  throw FlutterError(
+    'AppLocalizations.delegate failed to load unsupported locale "$locale". This is likely '
+    'an issue with the localizations generation tool. Please file an issue '
+    'on GitHub with a reproducible sample app and the gen-l10n configuration '
+    'that was used.',
+  );
+}

frontend/lib/l10n/app_localizations_en.dart

@@ -0,0 +1,212 @@
+// ignore: unused_import
+import 'package:intl/intl.dart' as intl;
+import 'app_localizations.dart';
+
+// ignore_for_file: type=lint
+
+/// The translations for English (`en`).
+class AppLocalizationsEn extends AppLocalizations {
+  AppLocalizationsEn([String locale = 'en']) : super(locale);
+
+  @override
+  String get settings => 'Settings';
+
+  @override
+  String get networkConfiguration => 'Network Configuration';
+
+  @override
+  String get backendServerUrl => 'Backend Server URL';
+
+  @override
+  String get saveNetworkSettings => 'Save Network Settings';
+
+  @override
+  String get serverUrlUpdated => 'Server URL Updated';
+
+  @override
+  String get themeCustomization => 'Theme Customization';
+
+  @override
+  String get appearanceMode => 'Appearance Mode';
+
+  @override
+  String get system => 'System';
+
+  @override
+  String get light => 'Light';
+
+  @override
+  String get dark => 'Dark';
+
+  @override
+  String get accentColor => 'Accent Color';
+
+  @override
+  String get explore => 'Explore';
+
+  @override
+  String get livePreviewThumbnails => 'Live Preview Thumbnails';
+
+  @override
+  String get livePreviewThumbnailsDesc =>
+      'Show cached snapshot covers for live rooms when available.';
+
+  @override
+  String get security => 'Security';
+
+  @override
+  String get oldPassword => 'Old Password';
+
+  @override
+  String get newPassword => 'New Password';
+
+  @override
+  String get changePassword => 'Change Password';
+
+  @override
+  String get logout => 'Logout';
+
+  @override
+  String get confirmLogout => 'Confirm Logout';
+
+  @override
+  String get confirmLogoutDesc => 'Are you sure you want to log out now?';
+
+  @override
+  String get cancel => 'Cancel';
+
+  @override
+  String get language => 'Language';
+
+  @override
+  String get selectLanguage => 'Select Language';
+
+  @override
+  String get english => 'English';
+
+  @override
+  String get simplifiedChinese => '简体中文';
+
+  @override
+  String get traditionalChinese => '繁體中文';
+
+  @override
+  String get japanese => '日本語';
+
+  @override
+  String get console => 'Console';
+
+  @override
+  String get failedToLoadRooms => 'Failed to load rooms';
+
+  @override
+  String get goLive => 'Go Live';
+
+  @override
+  String get noActiveRooms => 'No active rooms. Be the first!';
+
+  @override
+  String get hostId => 'Host ID';
+
+  @override
+  String get username => 'Username';
+
+  @override
+  String get password => 'Password';
+
+  @override
+  String get fillAllFields => 'Please fill in all fields';
+
+  @override
+  String get networkError => 'Network Error: Could not connect to server';
+
+  @override
+  String get loginFailed => 'Login Failed';
+
+  @override
+  String get login => 'LOGIN';
+
+  @override
+  String get dontHaveAccount => 'Don\'t have an account? Create one';
+
+  @override
+  String get createAccount => 'Create Account';
+
+  @override
+  String get joinHightube => 'Join Hightube';
+
+  @override
+  String get desiredUsername => 'Desired Username';
+
+  @override
+  String get register => 'REGISTER';
+
+  @override
+  String get alreadyHaveAccount => 'Already have an account? Login here';
+
+  @override
+  String get accountCreated => 'Account created! Please login.';
+
+  @override
+  String get playbackResolution => 'Playback Resolution';
+
+  @override
+  String get availableNow => 'Available now';
+
+  @override
+  String get waitingForTranscoding => 'Waiting for backend transcoding output';
+
+  @override
+  String get sendMessage => 'Send a message...';
+
+  @override
+  String get liveChat => 'Live Chat';
+
+  @override
+  String get refresh => 'Refresh';
+
+  @override
+  String get volume => 'Volume';
+
+  @override
+  String get danmakuOn => 'Danmaku On';
+
+  @override
+  String get danmakuOff => 'Danmaku Off';
+
+  @override
+  String get fullscreen => 'Fullscreen';
+
+  @override
+  String get exitFullscreen => 'Exit Fullscreen';
+
+  @override
+  String get resolution => 'Resolution';
+
+  @override
+  String get playbackOptionsDesc => 'Select an available transcoded stream.';
+
+  @override
+  String get sourceOnlyDesc => 'Only the source stream is available right now.';
+
+  @override
+  String get myStreamConsole => 'My Stream Console';
+
+  @override
+  String get noRoomInfo => 'No room info found.';
+
+  @override
+  String get roomTitle => 'Room Title';
+
+  @override
+  String get rtmpServerUrl => 'RTMP Server URL';
+
+  @override
+  String get streamKey => 'Stream Key (Keep Secret!)';
+
+  @override
+  String get copiedToClipboard => 'Copied to clipboard';
+
+  @override
+  String get failedToFetchRoomInfo => 'Failed to fetch room info';
+}

frontend/lib/l10n/app_localizations_ja.dart

@@ -0,0 +1,212 @@
+// ignore: unused_import
+import 'package:intl/intl.dart' as intl;
+import 'app_localizations.dart';
+
+// ignore_for_file: type=lint
+
+/// The translations for Japanese (`ja`).
+class AppLocalizationsJa extends AppLocalizations {
+  AppLocalizationsJa([String locale = 'ja']) : super(locale);
+
+  @override
+  String get settings => '設定';
+
+  @override
+  String get networkConfiguration => 'ネットワーク設定';
+
+  @override
+  String get backendServerUrl => 'バックエンドサーバーURL';
+
+  @override
+  String get saveNetworkSettings => 'ネットワーク設定を保存';
+
+  @override
+  String get serverUrlUpdated => 'サーバーURLが更新されました';
+
+  @override
+  String get themeCustomization => 'テーマのカスタマイズ';
+
+  @override
+  String get appearanceMode => '外観モード';
+
+  @override
+  String get system => 'システム';
+
+  @override
+  String get light => 'ライト';
+
+  @override
+  String get dark => 'ダーク';
+
+  @override
+  String get accentColor => 'アクセントカラー';
+
+  @override
+  String get explore => '探索';
+
+  @override
+  String get livePreviewThumbnails => 'ライブプレビューサムネイル';
+
+  @override
+  String get livePreviewThumbnailsDesc =>
+      '利用可能な場合、ライブルームのキャッシュされたスナップショットカバーを表示します。';
+
+  @override
+  String get security => 'セキュリティ';
+
+  @override
+  String get oldPassword => '現在のパスワード';
+
+  @override
+  String get newPassword => '新しいパスワード';
+
+  @override
+  String get changePassword => 'パスワードを変更';
+
+  @override
+  String get logout => 'ログアウト';
+
+  @override
+  String get confirmLogout => 'ログアウトの確認';
+
+  @override
+  String get confirmLogoutDesc => '今すぐログアウトしてもよろしいですか？';
+
+  @override
+  String get cancel => 'キャンセル';
+
+  @override
+  String get language => '言語';
+
+  @override
+  String get selectLanguage => '言語を選択';
+
+  @override
+  String get english => 'English';
+
+  @override
+  String get simplifiedChinese => '简体中文';
+
+  @override
+  String get traditionalChinese => '繁體中文';
+
+  @override
+  String get japanese => '日本語';
+
+  @override
+  String get console => 'コンソール';
+
+  @override
+  String get failedToLoadRooms => 'ルームの読み込みに失敗しました';
+
+  @override
+  String get goLive => 'ライブ配信を開始';
+
+  @override
+  String get noActiveRooms => '配信中のルームはありません。最初の配信者になりましょう！';
+
+  @override
+  String get hostId => '配信者 ID';
+
+  @override
+  String get username => 'ユーザー名';
+
+  @override
+  String get password => 'パスワード';
+
+  @override
+  String get fillAllFields => 'すべての項目を入力してください';
+
+  @override
+  String get networkError => 'ネットワークエラー：サーバーに接続できませんでした';
+
+  @override
+  String get loginFailed => 'ログインに失敗しました';
+
+  @override
+  String get login => 'ログイン';
+
+  @override
+  String get dontHaveAccount => 'アカウントをお持ちでないですか？新規登録';
+
+  @override
+  String get createAccount => 'アカウント作成';
+
+  @override
+  String get joinHightube => 'Hightube に参加';
+
+  @override
+  String get desiredUsername => 'ユーザー名';
+
+  @override
+  String get register => '登録';
+
+  @override
+  String get alreadyHaveAccount => '既にアカウントをお持ちですか？ログイン';
+
+  @override
+  String get accountCreated => 'アカウントが作成されました！ログインしてください。';
+
+  @override
+  String get playbackResolution => '再生解像度';
+
+  @override
+  String get availableNow => '利用可能';
+
+  @override
+  String get waitingForTranscoding => 'バックエンドのトランスコード出力を待機中';
+
+  @override
+  String get sendMessage => 'メッセージを送信...';
+
+  @override
+  String get liveChat => 'ライブチャット';
+
+  @override
+  String get refresh => '更新';
+
+  @override
+  String get volume => '音量';
+
+  @override
+  String get danmakuOn => '弾幕オン';
+
+  @override
+  String get danmakuOff => '弾幕オフ';
+
+  @override
+  String get fullscreen => '全画面';
+
+  @override
+  String get exitFullscreen => '全画面終了';
+
+  @override
+  String get resolution => '解像度';
+
+  @override
+  String get playbackOptionsDesc => '利用可能なトランスコード済みストリームを選択します。';
+
+  @override
+  String get sourceOnlyDesc => '現在、ソースストリームのみが利用可能です。';
+
+  @override
+  String get myStreamConsole => '配信コンソール';
+
+  @override
+  String get noRoomInfo => 'ルーム情報が見つかりません。';
+
+  @override
+  String get roomTitle => 'ルームタイトル';
+
+  @override
+  String get rtmpServerUrl => 'RTMP サーバー URL';
+
+  @override
+  String get streamKey => 'ストリームキー (秘密にしてください!)';
+
+  @override
+  String get copiedToClipboard => 'クリップボードにコピーしました';
+
+  @override
+  String get failedToFetchRoomInfo => 'ルーム情報の取得に失敗しました';
+}

frontend/lib/l10n/app_localizations_zh.dart

@@ -0,0 +1,417 @@
+// ignore: unused_import
+import 'package:intl/intl.dart' as intl;
+import 'app_localizations.dart';
+
+// ignore_for_file: type=lint
+
+/// The translations for Chinese (`zh`).
+class AppLocalizationsZh extends AppLocalizations {
+  AppLocalizationsZh([String locale = 'zh']) : super(locale);
+
+  @override
+  String get settings => '设置';
+
+  @override
+  String get networkConfiguration => '网络配置';
+
+  @override
+  String get backendServerUrl => '后端服务器地址';
+
+  @override
+  String get saveNetworkSettings => '保存网络设置';
+
+  @override
+  String get serverUrlUpdated => '服务器地址已更新';
+
+  @override
+  String get themeCustomization => '主题自定义';
+
+  @override
+  String get appearanceMode => '外观模式';
+
+  @override
+  String get system => '系统';
+
+  @override
+  String get light => '浅色';
+
+  @override
+  String get dark => '深色';
+
+  @override
+  String get accentColor => '强调色';
+
+  @override
+  String get explore => '探索';
+
+  @override
+  String get livePreviewThumbnails => '直播预览图';
+
+  @override
+  String get livePreviewThumbnailsDesc => '在可用时显示直播房间的缓存快照封面。';
+
+  @override
+  String get security => '安全';
+
+  @override
+  String get oldPassword => '旧密码';
+
+  @override
+  String get newPassword => '新密码';
+
+  @override
+  String get changePassword => '修改密码';
+
+  @override
+  String get logout => '退出登录';
+
+  @override
+  String get confirmLogout => '确认退出';
+
+  @override
+  String get confirmLogoutDesc => '您确定现在要退出登录吗？';
+
+  @override
+  String get cancel => '取消';
+
+  @override
+  String get language => '语言';
+
+  @override
+  String get selectLanguage => '选择语言';
+
+  @override
+  String get english => 'English';
+
+  @override
+  String get simplifiedChinese => '简体中文';
+
+  @override
+  String get traditionalChinese => '繁體中文';
+
+  @override
+  String get japanese => '日本語';
+
+  @override
+  String get console => '控制台';
+
+  @override
+  String get failedToLoadRooms => '加载房间失败';
+
+  @override
+  String get goLive => '开始直播';
+
+  @override
+  String get noActiveRooms => '暂无直播房间。快来开播吧！';
+
+  @override
+  String get hostId => '主播 ID';
+
+  @override
+  String get username => '用户名';
+
+  @override
+  String get password => '密码';
+
+  @override
+  String get fillAllFields => '请填写所有字段';
+
+  @override
+  String get networkError => '网络错误：无法连接到服务器';
+
+  @override
+  String get loginFailed => '登录失败';
+
+  @override
+  String get login => '登录';
+
+  @override
+  String get dontHaveAccount => '没有账号？立即注册';
+
+  @override
+  String get createAccount => '创建账号';
+
+  @override
+  String get joinHightube => '加入 Hightube';
+
+  @override
+  String get desiredUsername => '用户名';
+
+  @override
+  String get register => '注册';
+
+  @override
+  String get alreadyHaveAccount => '已有账号？立即登录';
+
+  @override
+  String get accountCreated => '账号创建成功！请登录。';
+
+  @override
+  String get playbackResolution => '播放分辨率';
+
+  @override
+  String get availableNow => '当前可用';
+
+  @override
+  String get waitingForTranscoding => '正在等待后端转码输出';
+
+  @override
+  String get sendMessage => '发送消息...';
+
+  @override
+  String get liveChat => '实时聊天';
+
+  @override
+  String get refresh => '刷新';
+
+  @override
+  String get volume => '音量';
+
+  @override
+  String get danmakuOn => '弹幕开启';
+
+  @override
+  String get danmakuOff => '弹幕关闭';
+
+  @override
+  String get fullscreen => '全屏';
+
+  @override
+  String get exitFullscreen => '退出全屏';
+
+  @override
+  String get resolution => '分辨率';
+
+  @override
+  String get playbackOptionsDesc => '选择可用的转码流。';
+
+  @override
+  String get sourceOnlyDesc => '目前仅源流可用。';
+
+  @override
+  String get myStreamConsole => '我的直播控制台';
+
+  @override
+  String get noRoomInfo => '未找到房间信息。';
+
+  @override
+  String get roomTitle => '房间标题';
+
+  @override
+  String get rtmpServerUrl => 'RTMP 服务器地址';
+
+  @override
+  String get streamKey => '推流码 (请务必保密!)';
+
+  @override
+  String get copiedToClipboard => '已复制到剪贴板';
+
+  @override
+  String get failedToFetchRoomInfo => '获取房间信息失败';
+}
+
+/// The translations for Chinese, using the Han script (`zh_Hant`).
+class AppLocalizationsZhHant extends AppLocalizationsZh {
+  AppLocalizationsZhHant() : super('zh_Hant');
+
+  @override
+  String get settings => '設定';
+
+  @override
+  String get networkConfiguration => '網路設定';
+
+  @override
+  String get backendServerUrl => '後端伺服器地址';
+
+  @override
+  String get saveNetworkSettings => '儲存網路設定';
+
+  @override
+  String get serverUrlUpdated => '伺服器地址已更新';
+
+  @override
+  String get themeCustomization => '主題自訂';
+
+  @override
+  String get appearanceMode => '外觀模式';
+
+  @override
+  String get system => '系統';
+
+  @override
+  String get light => '淺色';
+
+  @override
+  String get dark => '深色';
+
+  @override
+  String get accentColor => '強調色';
+
+  @override
+  String get explore => '探索';
+
+  @override
+  String get livePreviewThumbnails => '直播預覽圖';
+
+  @override
+  String get livePreviewThumbnailsDesc => '在可用時顯示直播房間的快取快照封面。';
+
+  @override
+  String get security => '安全';
+
+  @override
+  String get oldPassword => '舊密碼';
+
+  @override
+  String get newPassword => '新密碼';
+
+  @override
+  String get changePassword => '修改密碼';
+
+  @override
+  String get logout => '登出';
+
+  @override
+  String get confirmLogout => '確認登出';
+
+  @override
+  String get confirmLogoutDesc => '您確定現在要登出嗎？';
+
+  @override
+  String get cancel => '取消';
+
+  @override
+  String get language => '語言';
+
+  @override
+  String get selectLanguage => '選擇語言';
+
+  @override
+  String get english => 'English';
+
+  @override
+  String get simplifiedChinese => '简体中文';
+
+  @override
+  String get traditionalChinese => '繁體中文';
+
+  @override
+  String get japanese => '日本語';
+
+  @override
+  String get console => '控制台';
+
+  @override
+  String get failedToLoadRooms => '載入房間失敗';
+
+  @override
+  String get goLive => '開始直播';
+
+  @override
+  String get noActiveRooms => '暫無直播房間。快來開播吧！';
+
+  @override
+  String get hostId => '主播 ID';
+
+  @override
+  String get username => '用戶名';
+
+  @override
+  String get password => '密碼';
+
+  @override
+  String get fillAllFields => '請填寫所有欄位';
+
+  @override
+  String get networkError => '網路錯誤：無法連接到伺服器';
+
+  @override
+  String get loginFailed => '登錄失敗';
+
+  @override
+  String get login => '登錄';
+
+  @override
+  String get dontHaveAccount => '沒有帳號？立即註冊';
+
+  @override
+  String get createAccount => '建立帳號';
+
+  @override
+  String get joinHightube => '加入 Hightube';
+
+  @override
+  String get desiredUsername => '用戶名';
+
+  @override
+  String get register => '註冊';
+
+  @override
+  String get alreadyHaveAccount => '已有帳號？立即登錄';
+
+  @override
+  String get accountCreated => '帳號建立成功！請登錄。';
+
+  @override
+  String get playbackResolution => '播放解析度';
+
+  @override
+  String get availableNow => '目前可用';
+
+  @override
+  String get waitingForTranscoding => '正在等待後端轉碼輸出';
+
+  @override
+  String get sendMessage => '發送訊息...';
+
+  @override
+  String get liveChat => '即時聊天';
+
+  @override
+  String get refresh => '重新整理';
+
+  @override
+  String get volume => '音量';
+
+  @override
+  String get danmakuOn => '彈幕開啟';
+
+  @override
+  String get danmakuOff => '彈幕關閉';
+
+  @override
+  String get fullscreen => '全屏';
+
+  @override
+  String get exitFullscreen => '退出全屏';
+
+  @override
+  String get resolution => '解析度';
+
+  @override
+  String get playbackOptionsDesc => '選擇可用的轉碼流。';
+
+  @override
+  String get sourceOnlyDesc => '目前僅源流可用。';
+
+  @override
+  String get myStreamConsole => '我的直播控制台';
+
+  @override
+  String get noRoomInfo => '未找到房間資訊。';
+
+  @override
+  String get roomTitle => '房間標題';
+
+  @override
+  String get rtmpServerUrl => 'RTMP 伺服器地址';
+
+  @override
+  String get streamKey => '推流碼 (請務必保密!)';
+
+  @override
+  String get copiedToClipboard => '已複製到剪貼板';
+
+  @override
+  String get failedToFetchRoomInfo => '獲取房間資訊失敗';
+}

frontend/lib/l10n/app_zh.arb

@@ -0,0 +1,70 @@
+{
+  "@@locale": "zh",
+  "settings": "设置",
+  "networkConfiguration": "网络配置",
+  "backendServerUrl": "后端服务器地址",
+  "saveNetworkSettings": "保存网络设置",
+  "serverUrlUpdated": "服务器地址已更新",
+  "themeCustomization": "主题自定义",
+  "appearanceMode": "外观模式",
+  "system": "系统",
+  "light": "浅色",
+  "dark": "深色",
+  "accentColor": "强调色",
+  "explore": "探索",
+  "livePreviewThumbnails": "直播预览图",
+  "livePreviewThumbnailsDesc": "在可用时显示直播房间的缓存快照封面。",
+  "security": "安全",
+  "oldPassword": "旧密码",
+  "newPassword": "新密码",
+  "changePassword": "修改密码",
+  "logout": "退出登录",
+  "confirmLogout": "确认退出",
+  "confirmLogoutDesc": "您确定现在要退出登录吗？",
+  "cancel": "取消",
+  "language": "语言",
+  "selectLanguage": "选择语言",
+  "english": "English",
+  "simplifiedChinese": "简体中文",
+  "traditionalChinese": "繁體中文",
+  "japanese": "日本語",
+  "console": "控制台",
+  "failedToLoadRooms": "加载房间失败",
+  "goLive": "开始直播",
+  "noActiveRooms": "暂无直播房间。快来开播吧！",
+  "hostId": "主播 ID",
+  "username": "用户名",
+  "password": "密码",
+  "fillAllFields": "请填写所有字段",
+  "networkError": "网络错误：无法连接到服务器",
+  "loginFailed": "登录失败",
+  "login": "登录",
+  "dontHaveAccount": "没有账号？立即注册",
+  "createAccount": "创建账号",
+  "joinHightube": "加入 Hightube",
+  "desiredUsername": "用户名",
+  "register": "注册",
+  "alreadyHaveAccount": "已有账号？立即登录",
+  "accountCreated": "账号创建成功！请登录。",
+  "playbackResolution": "播放分辨率",
+  "availableNow": "当前可用",
+  "waitingForTranscoding": "正在等待后端转码输出",
+  "sendMessage": "发送消息...",
+  "liveChat": "实时聊天",
+  "refresh": "刷新",
+  "volume": "音量",
+  "danmakuOn": "弹幕开启",
+  "danmakuOff": "弹幕关闭",
+  "fullscreen": "全屏",
+  "exitFullscreen": "退出全屏",
+  "resolution": "分辨率",
+  "playbackOptionsDesc": "选择可用的转码流。",
+  "sourceOnlyDesc": "目前仅源流可用。",
+  "myStreamConsole": "我的直播控制台",
+  "noRoomInfo": "未找到房间信息。",
+  "roomTitle": "房间标题",
+  "rtmpServerUrl": "RTMP 服务器地址",
+  "streamKey": "推流码 (请务必保密!)",
+  "copiedToClipboard": "已复制到剪贴板",
+  "failedToFetchRoomInfo": "获取房间信息失败"
+}

frontend/lib/l10n/app_zh_Hant.arb

@@ -0,0 +1,70 @@
+{
+  "@@locale": "zh_Hant",
+  "settings": "設定",
+  "networkConfiguration": "網路設定",
+  "backendServerUrl": "後端伺服器地址",
+  "saveNetworkSettings": "儲存網路設定",
+  "serverUrlUpdated": "伺服器地址已更新",
+  "themeCustomization": "主題自訂",
+  "appearanceMode": "外觀模式",
+  "system": "系統",
+  "light": "淺色",
+  "dark": "深色",
+  "accentColor": "強調色",
+  "explore": "探索",
+  "livePreviewThumbnails": "直播預覽圖",
+  "livePreviewThumbnailsDesc": "在可用時顯示直播房間的快取快照封面。",
+  "security": "安全",
+  "oldPassword": "舊密碼",
+  "newPassword": "新密碼",
+  "changePassword": "修改密碼",
+  "logout": "登出",
+  "confirmLogout": "確認登出",
+  "confirmLogoutDesc": "您確定現在要登出嗎？",
+  "cancel": "取消",
+  "language": "語言",
+  "selectLanguage": "選擇語言",
+  "english": "English",
+  "simplifiedChinese": "简体中文",
+  "traditionalChinese": "繁體中文",
+  "japanese": "日本語",
+  "console": "控制台",
+  "failedToLoadRooms": "載入房間失敗",
+  "goLive": "開始直播",
+  "noActiveRooms": "暫無直播房間。快來開播吧！",
+  "hostId": "主播 ID",
+  "username": "用戶名",
+  "password": "密碼",
+  "fillAllFields": "請填寫所有欄位",
+  "networkError": "網路錯誤：無法連接到伺服器",
+  "loginFailed": "登錄失敗",
+  "login": "登錄",
+  "dontHaveAccount": "沒有帳號？立即註冊",
+  "createAccount": "建立帳號",
+  "joinHightube": "加入 Hightube",
+  "desiredUsername": "用戶名",
+  "register": "註冊",
+  "alreadyHaveAccount": "已有帳號？立即登錄",
+  "accountCreated": "帳號建立成功！請登錄。",
+  "playbackResolution": "播放解析度",
+  "availableNow": "目前可用",
+  "waitingForTranscoding": "正在等待後端轉碼輸出",
+  "sendMessage": "發送訊息...",
+  "liveChat": "即時聊天",
+  "refresh": "重新整理",
+  "volume": "音量",
+  "danmakuOn": "彈幕開啟",
+  "danmakuOff": "彈幕關閉",
+  "fullscreen": "全屏",
+  "exitFullscreen": "退出全屏",
+  "resolution": "解析度",
+  "playbackOptionsDesc": "選擇可用的轉碼流。",
+  "sourceOnlyDesc": "目前僅源流可用。",
+  "myStreamConsole": "我的直播控制台",
+  "noRoomInfo": "未找到房間資訊。",
+  "roomTitle": "房間標題",
+  "rtmpServerUrl": "RTMP 伺服器地址",
+  "streamKey": "推流碼 (請務必保密!)",
+  "copiedToClipboard": "已複製到剪貼板",
+  "failedToFetchRoomInfo": "獲取房間資訊失敗"
+}

frontend/lib/main.dart

@@ -1,10 +1,12 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:provider/provider.dart';
 import 'package:fvp/fvp.dart' as fvp;
 import 'providers/auth_provider.dart';
 import 'providers/settings_provider.dart';
 import 'pages/home_page.dart';
 import 'pages/login_page.dart';
+import 'l10n/app_localizations.dart';
 
 void main() {
   fvp.registerWith();
@@ -30,6 +32,14 @@ class HightubeApp extends StatelessWidget {
 
     return MaterialApp(
       title: 'Hightube',
+      localizationsDelegates: const [
+        AppLocalizations.delegate,
+        GlobalMaterialLocalizations.delegate,
+        GlobalWidgetsLocalizations.delegate,
+        GlobalCupertinoLocalizations.delegate,
+      ],
+      supportedLocales: AppLocalizations.supportedLocales,
+      locale: settings.locale,
       theme: ThemeData(
         useMaterial3: true,
         colorScheme: ColorScheme.fromSeed(

frontend/lib/pages/home_page.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:convert';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
+import '../l10n/app_localizations.dart';
 import '../providers/auth_provider.dart';
 import '../providers/settings_provider.dart';
 import '../services/api_service.dart';
@@ -10,8 +11,10 @@ import 'player_page.dart';
 import 'my_stream_page.dart';
 
 class HomePage extends StatefulWidget {
+  const HomePage({super.key});
+
   @override
-  _HomePageState createState() => _HomePageState();
+  State<HomePage> createState() => _HomePageState();
 }
 
 class _HomePageState extends State<HomePage> {
@@ -20,8 +23,9 @@ class _HomePageState extends State<HomePage> {
   @override
   Widget build(BuildContext context) {
     bool isWide = MediaQuery.of(context).size.width > 600;
+    final l10n = AppLocalizations.of(context)!;
 
-    final List<Widget> _pages = [
+    final List<Widget> pages = [
       _ExploreView(onGoLive: () => setState(() => _selectedIndex = 1)),
       MyStreamPage(),
       SettingsPage(),
@@ -36,22 +40,22 @@ class _HomePageState extends State<HomePage> {
               onDestinationSelected: (int index) =>
                   setState(() => _selectedIndex = index),
               labelType: NavigationRailLabelType.all,
-              destinations: const [
+              destinations: [
                 NavigationRailDestination(
-                  icon: Icon(Icons.explore),
-                  label: Text('Explore'),
+                  icon: const Icon(Icons.explore),
+                  label: Text(l10n.explore),
                 ),
                 NavigationRailDestination(
-                  icon: Icon(Icons.videocam),
-                  label: Text('Console'),
+                  icon: const Icon(Icons.videocam),
+                  label: Text(l10n.console),
                 ),
                 NavigationRailDestination(
-                  icon: Icon(Icons.settings),
-                  label: Text('Settings'),
+                  icon: const Icon(Icons.settings),
+                  label: Text(l10n.settings),
                 ),
               ],
             ),
-          Expanded(child: _pages[_selectedIndex]),
+          Expanded(child: pages[_selectedIndex]),
         ],
       ),
       bottomNavigationBar: !isWide
@@ -59,18 +63,18 @@ class _HomePageState extends State<HomePage> {
               selectedIndex: _selectedIndex,
               onDestinationSelected: (int index) =>
                   setState(() => _selectedIndex = index),
-              destinations: const [
+              destinations: [
                 NavigationDestination(
-                  icon: Icon(Icons.explore),
-                  label: 'Explore',
+                  icon: const Icon(Icons.explore),
+                  label: l10n.explore,
                 ),
                 NavigationDestination(
-                  icon: Icon(Icons.videocam),
-                  label: 'Console',
+                  icon: const Icon(Icons.videocam),
+                  label: l10n.console,
                 ),
                 NavigationDestination(
-                  icon: Icon(Icons.settings),
-                  label: 'Settings',
+                  icon: const Icon(Icons.settings),
+                  label: l10n.settings,
                 ),
               ],
             )
@@ -91,6 +95,8 @@ class _ExploreViewState extends State<_ExploreView> {
   List<dynamic> _activeRooms = [];
   bool _isLoading = false;
   Timer? _refreshTimer;
+  String _thumbnailCacheBuster = DateTime.now().millisecondsSinceEpoch
+      .toString();
 
   @override
   void initState() {
@@ -117,62 +123,95 @@ class _ExploreViewState extends State<_ExploreView> {
       final response = await api.getActiveRooms();
       if (response.statusCode == 200) {
         final data = jsonDecode(response.body);
-        if (mounted) setState(() => _activeRooms = data['active_rooms'] ?? []);
+        if (mounted) {
+          setState(() {
+            _activeRooms = data['active_rooms'] ?? [];
+            _thumbnailCacheBuster = DateTime.now().millisecondsSinceEpoch
+                .toString();
+          });
+        }
       }
     } catch (e) {
-      if (!isAuto && mounted)
+      if (!isAuto && mounted) {
+        final l10n = AppLocalizations.of(context);
         ScaffoldMessenger.of(
           context,
-        ).showSnackBar(SnackBar(content: Text("Failed to load rooms")));
+        ).showSnackBar(SnackBar(content: Text(l10n?.failedToLoadRooms ?? "Failed to load rooms")));
+      }
     } finally {
       if (!isAuto && mounted) setState(() => _isLoading = false);
     }
   }
 
+  Future<void> _confirmLogout() async {
+    final l10n = AppLocalizations.of(context)!;
+    final confirmed = await showDialog<bool>(
+      context: context,
+      builder: (context) {
+        return AlertDialog(
+          title: Text(l10n.confirmLogout),
+          content: Text(l10n.confirmLogoutDesc),
+          actions: [
+            TextButton(
+              onPressed: () => Navigator.pop(context, false),
+              child: Text(l10n.cancel),
+            ),
+            FilledButton(
+              onPressed: () => Navigator.pop(context, true),
+              child: Text(l10n.logout),
+            ),
+          ],
+        );
+      },
+    );
+
+    if (confirmed == true && mounted) {
+      await context.read<AuthProvider>().logout();
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     final settings = context.watch<SettingsProvider>();
+    final l10n = AppLocalizations.of(context)!;
 
     return Scaffold(
       appBar: AppBar(
-        title: Text("Explore", style: TextStyle(fontWeight: FontWeight.bold)),
+        title: Text(l10n.explore, style: const TextStyle(fontWeight: FontWeight.bold)),
         actions: [
           IconButton(
-            icon: Icon(Icons.refresh),
+            icon: const Icon(Icons.refresh),
             onPressed: () => _refreshRooms(),
           ),
-          IconButton(
-            icon: Icon(Icons.logout),
-            onPressed: () => context.read<AuthProvider>().logout(),
-          ),
+          IconButton(icon: const Icon(Icons.logout), onPressed: _confirmLogout),
         ],
       ),
       floatingActionButton: FloatingActionButton.extended(
         onPressed: widget.onGoLive,
-        label: Text("Go Live"),
-        icon: Icon(Icons.videocam),
+        label: Text(l10n.goLive),
+        icon: const Icon(Icons.videocam),
       ),
       body: RefreshIndicator(
         onRefresh: _refreshRooms,
         child: _isLoading && _activeRooms.isEmpty
-            ? Center(child: CircularProgressIndicator())
+            ? const Center(child: CircularProgressIndicator())
             : _activeRooms.isEmpty
             ? ListView(
                 children: [
                   Padding(
-                    padding: EdgeInsets.only(top: 100),
+                    padding: const EdgeInsets.only(top: 100),
                     child: Column(
                       mainAxisAlignment: MainAxisAlignment.center,
                       children: [
-                        Icon(
+                        const Icon(
                           Icons.live_tv_outlined,
                           size: 80,
                           color: Colors.grey,
                         ),
-                        SizedBox(height: 16),
+                        const SizedBox(height: 16),
                         Text(
-                          "No active rooms. Be the first!",
-                          style: TextStyle(color: Colors.grey, fontSize: 16),
+                          l10n.noActiveRooms,
+                          style: const TextStyle(color: Colors.grey, fontSize: 16),
                         ),
                       ],
                     ),
@@ -180,8 +219,8 @@ class _ExploreViewState extends State<_ExploreView> {
                 ],
               )
             : GridView.builder(
-                padding: EdgeInsets.all(12),
-                gridDelegate: SliverGridDelegateWithMaxCrossAxisExtent(
+                padding: const EdgeInsets.all(12),
+                gridDelegate: const SliverGridDelegateWithMaxCrossAxisExtent(
                   maxCrossAxisExtent: 400,
                   childAspectRatio: 1.2,
                   crossAxisSpacing: 12,
@@ -190,28 +229,29 @@ class _ExploreViewState extends State<_ExploreView> {
                 itemCount: _activeRooms.length,
                 itemBuilder: (context, index) {
                   final room = _activeRooms[index];
-                  return _buildRoomCard(room, settings);
+                  return _buildRoomCard(room, settings, l10n);
                 },
               ),
       ),
     );
   }
 
-  Widget _buildRoomCard(dynamic room, SettingsProvider settings) {
+  Widget _buildRoomCard(dynamic room, SettingsProvider settings, AppLocalizations l10n) {
+    final roomId = room['room_id'].toString();
     return Card(
       elevation: 4,
       clipBehavior: Clip.antiAlias,
       shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
       child: InkWell(
         onTap: () {
-          final playbackUrl = settings.playbackUrl(room['room_id'].toString());
+          final playbackUrl = settings.playbackUrl(roomId);
           Navigator.push(
             context,
             MaterialPageRoute(
               builder: (_) => PlayerPage(
                 title: room['title'],
                 playbackUrl: playbackUrl,
-                roomId: room['room_id'].toString(),
+                roomId: roomId,
               ),
             ),
           );
@@ -224,26 +264,47 @@ class _ExploreViewState extends State<_ExploreView> {
               child: Stack(
                 fit: StackFit.expand,
                 children: [
-                  Container(
-                    color: Theme.of(context).colorScheme.primaryContainer,
-                    child: Center(
-                      child: Icon(
-                        Icons.live_tv,
-                        size: 50,
-                        color: Theme.of(context).colorScheme.primary,
-                      ),
-                    ),
-                  ),
+                  settings.livePreviewThumbnailsEnabled
+                      ? Image.network(
+                          settings.thumbnailUrl(
+                            roomId,
+                            cacheBuster: _thumbnailCacheBuster,
+                          ),
+                          fit: BoxFit.cover,
+                          errorBuilder: (context, error, stackTrace) =>
+                              _buildRoomPreviewFallback(),
+                          loadingBuilder: (context, child, loadingProgress) {
+                            if (loadingProgress == null) {
+                              return child;
+                            }
+                            return Stack(
+                              fit: StackFit.expand,
+                              children: [
+                                _buildRoomPreviewFallback(),
+                                const Center(
+                                  child: SizedBox(
+                                    width: 22,
+                                    height: 22,
+                                    child: CircularProgressIndicator(
+                                      strokeWidth: 2,
+                                    ),
+                                  ),
+                                ),
+                              ],
+                            );
+                          },
+                        )
+                      : _buildRoomPreviewFallback(),
                   Positioned(
                     top: 8,
                     left: 8,
                     child: Container(
-                      padding: EdgeInsets.symmetric(horizontal: 8, vertical: 4),
+                      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                       decoration: BoxDecoration(
                         color: Colors.red,
                         borderRadius: BorderRadius.circular(4),
                       ),
-                      child: Row(
+                      child: const Row(
                         children: [
                           Icon(Icons.circle, size: 8, color: Colors.white),
                           SizedBox(width: 4),
@@ -275,7 +336,7 @@ class _ExploreViewState extends State<_ExploreView> {
                       radius: 16,
                       child: Text(room['user_id'].toString().substring(0, 1)),
                     ),
-                    SizedBox(width: 12),
+                    const SizedBox(width: 12),
                     Expanded(
                       child: Column(
                         mainAxisAlignment: MainAxisAlignment.center,
@@ -285,14 +346,14 @@ class _ExploreViewState extends State<_ExploreView> {
                             room['title'],
                             maxLines: 1,
                             overflow: TextOverflow.ellipsis,
-                            style: TextStyle(
+                            style: const TextStyle(
                               fontWeight: FontWeight.bold,
                               fontSize: 14,
                             ),
                           ),
                           Text(
-                            "Host ID: ${room['user_id']}",
-                            style: TextStyle(fontSize: 12, color: Colors.grey),
+                            "${l10n.hostId}: ${room['user_id']}",
+                            style: const TextStyle(fontSize: 12, color: Colors.grey),
                           ),
                         ],
                       ),
@@ -306,4 +367,17 @@ class _ExploreViewState extends State<_ExploreView> {
       ),
     );
   }
+
+  Widget _buildRoomPreviewFallback() {
+    return Container(
+      color: Theme.of(context).colorScheme.primaryContainer,
+      child: Center(
+        child: Icon(
+          Icons.live_tv,
+          size: 50,
+          color: Theme.of(context).colorScheme.primary,
+        ),
+      ),
+    );
+  }
 }

frontend/lib/pages/login_page.dart

@@ -1,6 +1,7 @@
 import 'dart:convert';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
+import '../l10n/app_localizations.dart';
 import '../providers/auth_provider.dart';
 import '../providers/settings_provider.dart';
 import '../services/api_service.dart';
@@ -11,7 +12,7 @@ class LoginPage extends StatefulWidget {
   const LoginPage({super.key});
 
   @override
-  _LoginPageState createState() => _LoginPageState();
+  State<LoginPage> createState() => _LoginPageState();
 }
 
 class _LoginPageState extends State<LoginPage> {
@@ -29,10 +30,11 @@ class _LoginPageState extends State<LoginPage> {
   }
 
   void _handleLogin() async {
+    final l10n = AppLocalizations.of(context)!;
     if (_usernameController.text.isEmpty || _passwordController.text.isEmpty) {
       ScaffoldMessenger.of(
         context,
-      ).showSnackBar(SnackBar(content: Text("Please fill in all fields")));
+      ).showSnackBar(SnackBar(content: Text(l10n.fillAllFields)));
       return;
     }
 
@@ -53,7 +55,7 @@ class _LoginPageState extends State<LoginPage> {
         if (!mounted) {
           return;
         }
-        final error = jsonDecode(response.body)['error'] ?? "Login Failed";
+        final error = jsonDecode(response.body)['error'] ?? l10n.loginFailed;
         ScaffoldMessenger.of(
           context,
         ).showSnackBar(SnackBar(content: Text(error)));
@@ -62,9 +64,9 @@ class _LoginPageState extends State<LoginPage> {
       if (!mounted) {
         return;
       }
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text("Network Error: Could not connect to server")),
-      );
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(SnackBar(content: Text(l10n.networkError)));
     } finally {
       if (mounted) setState(() => _isLoading = false);
     }
@@ -72,11 +74,13 @@ class _LoginPageState extends State<LoginPage> {
 
   @override
   Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context)!;
+
     return Scaffold(
       appBar: AppBar(
         actions: [
           IconButton(
-            icon: Icon(Icons.settings),
+            icon: const Icon(Icons.settings),
             onPressed: () => Navigator.push(
               context,
               MaterialPageRoute(builder: (_) => const SettingsPage()),
@@ -88,7 +92,7 @@ class _LoginPageState extends State<LoginPage> {
         child: SingleChildScrollView(
           padding: const EdgeInsets.symmetric(horizontal: 32.0),
           child: ConstrainedBox(
-            constraints: BoxConstraints(maxWidth: 400),
+            constraints: const BoxConstraints(maxWidth: 400),
             child: Column(
               mainAxisAlignment: MainAxisAlignment.center,
               children: [
@@ -98,7 +102,7 @@ class _LoginPageState extends State<LoginPage> {
                   size: 80,
                   color: Theme.of(context).colorScheme.primary,
                 ),
-                SizedBox(height: 16),
+                const SizedBox(height: 16),
                 Text(
                   "HIGHTUBE",
                   style: TextStyle(
@@ -108,11 +112,11 @@ class _LoginPageState extends State<LoginPage> {
                     color: Theme.of(context).colorScheme.primary,
                   ),
                 ),
-                Text(
+                const Text(
                   "Open Source Live Platform",
                   style: TextStyle(color: Colors.grey),
                 ),
-                SizedBox(height: 48),
+                const SizedBox(height: 48),
 
                 // Fields
                 TextField(
@@ -120,14 +124,14 @@ class _LoginPageState extends State<LoginPage> {
                   textInputAction: TextInputAction.next,
                   onSubmitted: (_) => _passwordFocusNode.requestFocus(),
                   decoration: InputDecoration(
-                    labelText: "Username",
-                    prefixIcon: Icon(Icons.person),
+                    labelText: l10n.username,
+                    prefixIcon: const Icon(Icons.person),
                     border: OutlineInputBorder(
                       borderRadius: BorderRadius.circular(12),
                     ),
                   ),
                 ),
-                SizedBox(height: 16),
+                const SizedBox(height: 16),
                 TextField(
                   controller: _passwordController,
                   focusNode: _passwordFocusNode,
@@ -139,14 +143,14 @@ class _LoginPageState extends State<LoginPage> {
                     }
                   },
                   decoration: InputDecoration(
-                    labelText: "Password",
-                    prefixIcon: Icon(Icons.lock),
+                    labelText: l10n.password,
+                    prefixIcon: const Icon(Icons.lock),
                     border: OutlineInputBorder(
                       borderRadius: BorderRadius.circular(12),
                     ),
                   ),
                 ),
-                SizedBox(height: 32),
+                const SizedBox(height: 32),
 
                 // Login Button
                 SizedBox(
@@ -160,22 +164,22 @@ class _LoginPageState extends State<LoginPage> {
                       ),
                     ),
                     child: _isLoading
-                        ? CircularProgressIndicator()
+                        ? const CircularProgressIndicator()
                         : Text(
-                            "LOGIN",
-                            style: TextStyle(fontWeight: FontWeight.bold),
+                            l10n.login,
+                            style: const TextStyle(fontWeight: FontWeight.bold),
                           ),
                   ),
                 ),
-                SizedBox(height: 16),
+                const SizedBox(height: 16),
 
                 // Register Link
                 TextButton(
                   onPressed: () => Navigator.push(
                     context,
-                    MaterialPageRoute(builder: (_) => RegisterPage()),
+                    MaterialPageRoute(builder: (_) => const RegisterPage()),
                   ),
-                  child: Text("Don't have an account? Create one"),
+                  child: Text(l10n.dontHaveAccount),
                 ),
               ],
             ),

frontend/lib/pages/my_stream_page.dart

@@ -2,13 +2,17 @@ import 'dart:convert';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import 'package:flutter/services.dart';
+import '../l10n/app_localizations.dart';
 import '../providers/auth_provider.dart';
 import '../providers/settings_provider.dart';
 import '../services/api_service.dart';
+import '../widgets/android_quick_stream_panel.dart';
 
 class MyStreamPage extends StatefulWidget {
+  const MyStreamPage({super.key});
+
   @override
-  _MyStreamPageState createState() => _MyStreamPageState();
+  State<MyStreamPage> createState() => _MyStreamPageState();
 }
 
 class _MyStreamPageState extends State<MyStreamPage> {
@@ -29,78 +33,107 @@ class _MyStreamPageState extends State<MyStreamPage> {
 
     try {
       final response = await api.getMyRoom();
+      if (!mounted) {
+        return;
+      }
       if (response.statusCode == 200) {
         setState(() => _roomInfo = jsonDecode(response.body));
       }
     } catch (e) {
-      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text("Failed to fetch room info")));
+      if (!mounted) {
+        return;
+      }
+      final l10n = AppLocalizations.of(context);
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(SnackBar(content: Text(l10n?.failedToFetchRoomInfo ?? "Failed to fetch room info")));
     } finally {
-      setState(() => _isLoading = false);
+      if (mounted) {
+        setState(() => _isLoading = false);
+      }
     }
   }
 
   @override
   Widget build(BuildContext context) {
     final settings = context.watch<SettingsProvider>();
+    final l10n = AppLocalizations.of(context)!;
 
     return Scaffold(
-      appBar: AppBar(title: Text("My Stream Console")),
+      appBar: AppBar(title: Text(l10n.myStreamConsole)),
       body: _isLoading
-          ? Center(child: CircularProgressIndicator())
+          ? const Center(child: CircularProgressIndicator())
           : _roomInfo == null
-              ? Center(child: Text("No room info found."))
-              : SingleChildScrollView(
-                  padding: EdgeInsets.all(20),
-                  child: Column(
-                    crossAxisAlignment: CrossAxisAlignment.start,
-                    children: [
-                      _buildInfoCard(
-                        title: "Room Title",
-                        value: _roomInfo!['title'],
-                        icon: Icons.edit,
-                        onTap: () {
-                          // TODO: Implement title update API later
-                          ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text("Title editing coming soon!")));
-                        },
-                      ),
-                      SizedBox(height: 20),
-                      _buildInfoCard(
-                        title: "RTMP Server URL",
-                        value: settings.rtmpUrl,
-                        icon: Icons.copy,
-                        onTap: () {
-                          Clipboard.setData(ClipboardData(text: settings.rtmpUrl));
-                          ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text("Server URL copied to clipboard")));
-                        },
-                      ),
-                      SizedBox(height: 20),
-                      _buildInfoCard(
-                        title: "Stream Key (Keep Secret!)",
-                        value: _roomInfo!['stream_key'],
-                        icon: Icons.copy,
-                        isSecret: true,
-                        onTap: () {
-                          Clipboard.setData(ClipboardData(text: _roomInfo!['stream_key']));
-                          ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text("Stream Key copied to clipboard")));
-                        },
-                      ),
-                      SizedBox(height: 30),
-                      Center(
-                        child: Column(
-                          children: [
-                            Icon(Icons.info_outline, color: Colors.grey),
-                            SizedBox(height: 8),
-                            Text(
-                              "Use OBS or other tools to stream to this address.",
-                              textAlign: TextAlign.center,
-                              style: TextStyle(color: Colors.grey, fontSize: 12),
-                            ),
-                          ],
-                        ),
-                      ),
-                    ],
+          ? Center(child: Text(l10n.noRoomInfo))
+          : SingleChildScrollView(
+              padding: const EdgeInsets.all(20),
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  _buildInfoCard(
+                    title: l10n.roomTitle,
+                    value: _roomInfo!['title'],
+                    icon: Icons.edit,
+                    onTap: () {
+                      // TODO: Implement title update API later
+                      ScaffoldMessenger.of(context).showSnackBar(
+                        const SnackBar(content: Text("Title editing coming soon!")),
+                      );
+                    },
                   ),
-                ),
+                  const SizedBox(height: 20),
+                  _buildInfoCard(
+                    title: l10n.rtmpServerUrl,
+                    value: settings.rtmpUrl,
+                    icon: Icons.copy,
+                    onTap: () {
+                      Clipboard.setData(ClipboardData(text: settings.rtmpUrl));
+                      ScaffoldMessenger.of(context).showSnackBar(
+                        SnackBar(
+                          content: Text(l10n.copiedToClipboard),
+                        ),
+                      );
+                    },
+                  ),
+                  const SizedBox(height: 20),
+                  _buildInfoCard(
+                    title: l10n.streamKey,
+                    value: _roomInfo!['stream_key'],
+                    icon: Icons.copy,
+                    isSecret: true,
+                    onTap: () {
+                      Clipboard.setData(
+                        ClipboardData(text: _roomInfo!['stream_key']),
+                      );
+                      ScaffoldMessenger.of(context).showSnackBar(
+                        SnackBar(
+                          content: Text(l10n.copiedToClipboard),
+                        ),
+                      );
+                    },
+                  ),
+                  const SizedBox(height: 24),
+                  AndroidQuickStreamPanel(
+                    rtmpBaseUrl: settings.rtmpUrl,
+                    streamKey: _roomInfo!['stream_key'],
+                  ),
+                  const SizedBox(height: 30),
+                  const Center(
+                    child: Column(
+                      children: [
+                        Icon(Icons.info_outline, color: Colors.grey),
+                        SizedBox(height: 8),
+                        Text(
+                          "Use OBS or other tools to stream to this address.",
+                          textAlign: TextAlign.center,
+                          style: TextStyle(color: Colors.grey, fontSize: 12),
+                        ),
+                      ],
+                    ),
+                  ),
+                ],
+              ),
+            ),
     );
   }
 
@@ -113,10 +146,10 @@ class _MyStreamPageState extends State<MyStreamPage> {
   }) {
     return Card(
       child: ListTile(
-        title: Text(title, style: TextStyle(fontSize: 12, color: Colors.grey)),
+        title: Text(title, style: const TextStyle(fontSize: 12, color: Colors.grey)),
         subtitle: Text(
           isSecret ? "••••••••••••••••" : value,
-          style: TextStyle(fontWeight: FontWeight.bold, fontSize: 16),
+          style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 16),
         ),
         trailing: IconButton(icon: Icon(icon), onPressed: onTap),
       ),

frontend/lib/pages/player_page.dart

@@ -7,6 +7,7 @@ import 'package:flutter/services.dart';
 import 'package:provider/provider.dart';
 import 'package:video_player/video_player.dart';
 
+import '../l10n/app_localizations.dart';
 import '../providers/auth_provider.dart';
 import '../providers/settings_provider.dart';
 import '../services/api_service.dart';
@@ -42,6 +43,7 @@ class _PlayerPageState extends State<PlayerPage> {
   bool _isRefreshing = false;
   bool _isFullscreen = false;
   bool _controlsVisible = true;
+  double _volume = kIsWeb ? 0.0 : 1.0;
   int _playerVersion = 0;
   String _selectedResolution = 'Source';
   List<String> _availableResolutions = const ['Source'];
@@ -63,6 +65,7 @@ class _PlayerPageState extends State<PlayerPage> {
     _controller = VideoPlayerController.networkUrl(Uri.parse(playbackUrl));
     try {
       await _controller!.initialize();
+      await _controller!.setVolume(_volume);
       _controller!.play();
       if (mounted) setState(() {});
     } catch (e) {
@@ -254,6 +257,77 @@ class _PlayerPageState extends State<PlayerPage> {
     _showControls();
   }
 
+  Future<void> _setVolume(double volume) async {
+    final nextVolume = volume.clamp(0.0, 1.0);
+    if (!mounted) {
+      return;
+    }
+
+    setState(() => _volume = nextVolume);
+
+    if (!kIsWeb && _controller != null) {
+      await _controller!.setVolume(nextVolume);
+    }
+  }
+
+  Future<void> _openVolumeSheet() async {
+    _showControls();
+    final l10n = AppLocalizations.of(context)!;
+    await showModalBottomSheet<void>(
+      context: context,
+      builder: (context) {
+        return SafeArea(
+          child: Padding(
+            padding: const EdgeInsets.fromLTRB(20, 16, 20, 28),
+            child: StatefulBuilder(
+              builder: (context, setSheetState) {
+                return Column(
+                  mainAxisSize: MainAxisSize.min,
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Text(
+                      l10n.volume,
+                      style: Theme.of(context).textTheme.titleMedium,
+                    ),
+                    const SizedBox(height: 12),
+                    Row(
+                      children: [
+                        Icon(
+                          _volume == 0
+                              ? Icons.volume_off
+                              : _volume < 0.5
+                              ? Icons.volume_down
+                              : Icons.volume_up,
+                        ),
+                        Expanded(
+                          child: Slider(
+                            value: _volume,
+                            min: 0,
+                            max: 1,
+                            divisions: 20,
+                            label: '${(_volume * 100).round()}%',
+                            onChanged: (value) {
+                              setSheetState(() => _volume = value);
+                              _setVolume(value);
+                            },
+                          ),
+                        ),
+                        SizedBox(
+                          width: 48,
+                          child: Text('${(_volume * 100).round()}%'),
+                        ),
+                      ],
+                    ),
+                  ],
+                );
+              },
+            ),
+          ),
+        );
+      },
+    );
+  }
+
   void _showControls() {
     _controlsHideTimer?.cancel();
     if (mounted) {
@@ -281,6 +355,7 @@ class _PlayerPageState extends State<PlayerPage> {
     if (!mounted) {
       return;
     }
+    final l10n = AppLocalizations.of(context)!;
 
     final nextResolution = await showModalBottomSheet<String>(
       context: context,
@@ -292,11 +367,11 @@ class _PlayerPageState extends State<PlayerPage> {
             mainAxisSize: MainAxisSize.min,
             children: [
               ListTile(
-                title: Text('Playback Resolution'),
+                title: Text(l10n.playbackResolution),
                 subtitle: Text(
                   available.length > 1
-                      ? 'Select an available transcoded stream.'
-                      : 'Only the source stream is available right now.',
+                      ? l10n.playbackOptionsDesc
+                      : l10n.sourceOnlyDesc,
                 ),
               ),
               ...options.map((option) {
@@ -310,8 +385,8 @@ class _PlayerPageState extends State<PlayerPage> {
                   ),
                   title: Text(option),
                   subtitle: enabled
-                      ? const Text('Available now')
-                      : const Text('Waiting for backend transcoding output'),
+                      ? Text(l10n.availableNow)
+                      : Text(l10n.waitingForTranscoding),
                   onTap: enabled ? () => Navigator.pop(context, option) : null,
                 );
               }),
@@ -439,6 +514,7 @@ class _PlayerPageState extends State<PlayerPage> {
                   ? WebStreamPlayer(
                       key: ValueKey('web-player-$_playerVersion'),
                       streamUrl: _currentPlaybackUrl(),
+                      volume: _volume,
                     )
                   : _controller != null && _controller!.value.isInitialized
                   ? AspectRatio(
@@ -517,6 +593,7 @@ class _PlayerPageState extends State<PlayerPage> {
   }
 
   Widget _buildPlaybackControls() {
+    final l10n = AppLocalizations.of(context)!;
     return IgnorePointer(
       ignoring: !_controlsVisible,
       child: AnimatedOpacity(
@@ -547,19 +624,28 @@ class _PlayerPageState extends State<PlayerPage> {
                 children: [
                   _buildControlButton(
                     icon: Icons.refresh,
-                    label: "Refresh",
+                    label: l10n.refresh,
                     onPressed: _refreshPlayer,
                   ),
+                  _buildControlButton(
+                    icon: _volume == 0
+                        ? Icons.volume_off
+                        : _volume < 0.5
+                        ? Icons.volume_down
+                        : Icons.volume_up,
+                    label: l10n.volume,
+                    onPressed: _openVolumeSheet,
+                  ),
                   _buildControlButton(
                     icon: _showDanmaku ? Icons.subtitles : Icons.subtitles_off,
-                    label: _showDanmaku ? "Danmaku On" : "Danmaku Off",
+                    label: _showDanmaku ? l10n.danmakuOn : l10n.danmakuOff,
                     onPressed: _toggleDanmaku,
                   ),
                   _buildControlButton(
                     icon: _isFullscreen
                         ? Icons.fullscreen_exit
                         : Icons.fullscreen,
-                    label: _isFullscreen ? "Exit Fullscreen" : "Fullscreen",
+                    label: _isFullscreen ? l10n.exitFullscreen : l10n.fullscreen,
                     onPressed: _toggleFullscreen,
                   ),
                   _buildControlButton(
@@ -597,23 +683,24 @@ class _PlayerPageState extends State<PlayerPage> {
 
   // 抽离聊天区域组件
   Widget _buildChatSection() {
+    final l10n = AppLocalizations.of(context)!;
     return Column(
       children: [
         Container(
-          padding: EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+          padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
           color: Theme.of(context).colorScheme.surfaceContainerHighest,
           child: Row(
             children: [
-              Icon(Icons.chat_bubble_outline, size: 16),
-              SizedBox(width: 8),
-              Text("Live Chat", style: TextStyle(fontWeight: FontWeight.bold)),
+              const Icon(Icons.chat_bubble_outline, size: 16),
+              const SizedBox(width: 8),
+              Text(l10n.liveChat, style: const TextStyle(fontWeight: FontWeight.bold)),
             ],
           ),
         ),
         Expanded(
           child: ListView.builder(
             reverse: true,
-            padding: EdgeInsets.all(8),
+            padding: const EdgeInsets.all(8),
             itemCount: _messages.length,
             itemBuilder: (context, index) {
               final m = _messages[index];
@@ -621,7 +708,7 @@ class _PlayerPageState extends State<PlayerPage> {
             },
           ),
         ),
-        Divider(height: 1),
+        const Divider(height: 1),
         Padding(
           padding: const EdgeInsets.all(8.0),
           child: Row(
@@ -630,11 +717,11 @@ class _PlayerPageState extends State<PlayerPage> {
                 child: TextField(
                   controller: _msgController,
                   decoration: InputDecoration(
-                    hintText: "Send a message...",
+                    hintText: l10n.sendMessage,
                     border: OutlineInputBorder(
                       borderRadius: BorderRadius.circular(20),
                     ),
-                    contentPadding: EdgeInsets.symmetric(
+                    contentPadding: const EdgeInsets.symmetric(
                       horizontal: 16,
                       vertical: 8,
                     ),

frontend/lib/pages/register_page.dart

@@ -1,12 +1,15 @@
 import 'dart:convert';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
+import '../l10n/app_localizations.dart';
 import '../providers/settings_provider.dart';
 import '../services/api_service.dart';
 
 class RegisterPage extends StatefulWidget {
+  const RegisterPage({super.key});
+
   @override
-  _RegisterPageState createState() => _RegisterPageState();
+  State<RegisterPage> createState() => _RegisterPageState();
 }
 
 class _RegisterPageState extends State<RegisterPage> {
@@ -15,8 +18,11 @@ class _RegisterPageState extends State<RegisterPage> {
   bool _isLoading = false;
 
   void _handleRegister() async {
+    final l10n = AppLocalizations.of(context)!;
     if (_usernameController.text.isEmpty || _passwordController.text.isEmpty) {
-      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text("Please fill in all fields")));
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(SnackBar(content: Text(l10n.fillAllFields)));
       return;
     }
 
@@ -25,16 +31,32 @@ class _RegisterPageState extends State<RegisterPage> {
     final api = ApiService(settings, null);
 
     try {
-      final response = await api.register(_usernameController.text, _passwordController.text);
+      final response = await api.register(
+        _usernameController.text,
+        _passwordController.text,
+      );
+      if (!mounted) {
+        return;
+      }
       if (response.statusCode == 201) {
-        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text("Account created! Please login.")));
+        ScaffoldMessenger.of(
+          context,
+        ).showSnackBar(SnackBar(content: Text(l10n.accountCreated)));
         Navigator.pop(context);
       } else {
-        final error = jsonDecode(response.body)['error'] ?? "Registration Failed";
-        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(error)));
+        final error =
+            jsonDecode(response.body)['error'] ?? "Registration Failed";
+        ScaffoldMessenger.of(
+          context,
+        ).showSnackBar(SnackBar(content: Text(error)));
       }
     } catch (e) {
-      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text("Network Error")));
+      if (!mounted) {
+        return;
+      }
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(SnackBar(content: Text(l10n.networkError)));
     } finally {
       if (mounted) setState(() => _isLoading = false);
     }
@@ -42,57 +64,75 @@ class _RegisterPageState extends State<RegisterPage> {
 
   @override
   Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context)!;
     return Scaffold(
-      appBar: AppBar(title: Text("Create Account")),
+      appBar: AppBar(title: Text(l10n.createAccount)),
       body: Center(
         child: SingleChildScrollView(
           padding: const EdgeInsets.symmetric(horizontal: 32.0),
           child: ConstrainedBox(
-            constraints: BoxConstraints(maxWidth: 400),
+            constraints: const BoxConstraints(maxWidth: 400),
             child: Column(
               mainAxisAlignment: MainAxisAlignment.center,
               children: [
-                Icon(Icons.person_add_outlined, size: 64, color: Theme.of(context).colorScheme.primary),
-                SizedBox(height: 24),
-                Text(
-                  "Join Hightube",
-                  style: Theme.of(context).textTheme.headlineMedium?.copyWith(fontWeight: FontWeight.bold),
+                Icon(
+                  Icons.person_add_outlined,
+                  size: 64,
+                  color: Theme.of(context).colorScheme.primary,
                 ),
-                SizedBox(height: 48),
+                const SizedBox(height: 24),
+                Text(
+                  l10n.joinHightube,
+                  style: Theme.of(context).textTheme.headlineMedium?.copyWith(
+                    fontWeight: FontWeight.bold,
+                  ),
+                ),
+                const SizedBox(height: 48),
                 TextField(
                   controller: _usernameController,
                   decoration: InputDecoration(
-                    labelText: "Desired Username",
-                    prefixIcon: Icon(Icons.person),
-                    border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
+                    labelText: l10n.desiredUsername,
+                    prefixIcon: const Icon(Icons.person),
+                    border: OutlineInputBorder(
+                      borderRadius: BorderRadius.circular(12),
+                    ),
                   ),
                 ),
-                SizedBox(height: 16),
+                const SizedBox(height: 16),
                 TextField(
                   controller: _passwordController,
                   obscureText: true,
                   decoration: InputDecoration(
-                    labelText: "Password",
-                    prefixIcon: Icon(Icons.lock),
-                    border: OutlineInputBorder(borderRadius: BorderRadius.circular(12)),
+                    labelText: l10n.password,
+                    prefixIcon: const Icon(Icons.lock),
+                    border: OutlineInputBorder(
+                      borderRadius: BorderRadius.circular(12),
+                    ),
                   ),
                 ),
-                SizedBox(height: 32),
+                const SizedBox(height: 32),
                 SizedBox(
                   width: double.infinity,
                   height: 50,
                   child: ElevatedButton(
                     onPressed: _isLoading ? null : _handleRegister,
                     style: ElevatedButton.styleFrom(
-                      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
+                      shape: RoundedRectangleBorder(
+                        borderRadius: BorderRadius.circular(12),
+                      ),
                     ),
-                    child: _isLoading ? CircularProgressIndicator() : Text("REGISTER", style: TextStyle(fontWeight: FontWeight.bold)),
+                    child: _isLoading
+                        ? const CircularProgressIndicator()
+                        : Text(
+                            l10n.register,
+                            style: const TextStyle(fontWeight: FontWeight.bold),
+                          ),
                   ),
                 ),
-                SizedBox(height: 16),
+                const SizedBox(height: 16),
                 TextButton(
                   onPressed: () => Navigator.pop(context),
-                  child: Text("Already have an account? Login here"),
+                  child: Text(l10n.alreadyHaveAccount),
                 ),
               ],
             ),

frontend/lib/pages/settings_page.dart

@@ -2,6 +2,7 @@ import 'dart:convert';
 
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
+import '../l10n/app_localizations.dart';
 
 import '../providers/auth_provider.dart';
 import '../providers/settings_provider.dart';
@@ -11,7 +12,7 @@ class SettingsPage extends StatefulWidget {
   const SettingsPage({super.key});
 
   @override
-  _SettingsPageState createState() => _SettingsPageState();
+  State<SettingsPage> createState() => _SettingsPageState();
 }
 
 class _SettingsPageState extends State<SettingsPage> {
@@ -88,15 +89,45 @@ class _SettingsPageState extends State<SettingsPage> {
     }
   }
 
+  Future<void> _confirmLogout(AuthProvider auth, AppLocalizations l10n) async {
+    final confirmed = await showDialog<bool>(
+      context: context,
+      builder: (context) {
+        return AlertDialog(
+          title: Text(l10n.confirmLogout),
+          content: Text(l10n.confirmLogoutDesc),
+          actions: [
+            TextButton(
+              onPressed: () => Navigator.pop(context, false),
+              child: Text(l10n.cancel),
+            ),
+            FilledButton(
+              onPressed: () => Navigator.pop(context, true),
+              child: Text(l10n.logout),
+            ),
+          ],
+        );
+      },
+    );
+
+    if (confirmed == true && mounted) {
+      await auth.logout();
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     final auth = context.watch<AuthProvider>();
     final settings = context.watch<SettingsProvider>();
     final isAuthenticated = auth.isAuthenticated;
+    final l10n = AppLocalizations.of(context)!;
 
     return Scaffold(
       appBar: AppBar(
-        title: Text("Settings", style: TextStyle(fontWeight: FontWeight.bold)),
+        title: Text(
+          l10n.settings,
+          style: TextStyle(fontWeight: FontWeight.bold),
+        ),
         centerTitle: true,
       ),
       body: SingleChildScrollView(
@@ -108,12 +139,62 @@ class _SettingsPageState extends State<SettingsPage> {
               _buildProfileSection(auth),
               const SizedBox(height: 32),
             ],
-            _buildSectionTitle("Network Configuration"),
+
+            _buildSectionTitle(l10n.language),
+            const SizedBox(height: 16),
+            DropdownButtonFormField<Locale?>(
+              initialValue: settings.locale == null
+                  ? null
+                  : AppLocalizations.supportedLocales
+                        .cast<Locale?>()
+                        .firstWhere(
+                          (l) =>
+                              l?.languageCode ==
+                                  settings.locale?.languageCode &&
+                              l?.scriptCode == settings.locale?.scriptCode,
+                          orElse: () => null,
+                        ),
+              decoration: InputDecoration(
+                labelText: l10n.selectLanguage,
+                prefixIcon: const Icon(Icons.language),
+                border: OutlineInputBorder(
+                  borderRadius: BorderRadius.circular(12),
+                ),
+              ),
+              items: [
+                DropdownMenuItem(value: null, child: Text(l10n.system)),
+                DropdownMenuItem(
+                  value: const Locale('en'),
+                  child: Text(l10n.english),
+                ),
+                DropdownMenuItem(
+                  value: const Locale('zh'),
+                  child: Text(l10n.simplifiedChinese),
+                ),
+                DropdownMenuItem(
+                  value: const Locale.fromSubtags(
+                    languageCode: 'zh',
+                    scriptCode: 'Hant',
+                  ),
+                  child: Text(l10n.traditionalChinese),
+                ),
+                DropdownMenuItem(
+                  value: const Locale('ja'),
+                  child: Text(l10n.japanese),
+                ),
+              ],
+              onChanged: (Locale? newLocale) {
+                settings.setLocale(newLocale);
+              },
+            ),
+            const SizedBox(height: 32),
+
+            _buildSectionTitle(l10n.networkConfiguration),
             const SizedBox(height: 16),
             TextField(
               controller: _urlController,
               decoration: InputDecoration(
-                labelText: "Backend Server URL",
+                labelText: l10n.backendServerUrl,
                 hintText: "http://127.0.0.1:8080",
                 prefixIcon: Icon(Icons.lan),
                 border: OutlineInputBorder(
@@ -131,13 +212,13 @@ class _SettingsPageState extends State<SettingsPage> {
                   );
                   ScaffoldMessenger.of(context).showSnackBar(
                     SnackBar(
-                      content: Text("Server URL Updated"),
+                      content: Text(l10n.serverUrlUpdated),
                       behavior: SnackBarBehavior.floating,
                     ),
                   );
                 },
                 icon: Icon(Icons.save),
-                label: Text("Save Network Settings"),
+                label: Text(l10n.saveNetworkSettings),
                 style: ElevatedButton.styleFrom(
                   backgroundColor: Theme.of(
                     context,
@@ -153,28 +234,28 @@ class _SettingsPageState extends State<SettingsPage> {
             ),
             const SizedBox(height: 32),
 
-            _buildSectionTitle("Theme Customization"),
+            _buildSectionTitle(l10n.themeCustomization),
             const SizedBox(height: 16),
             Text(
-              "Appearance Mode",
+              l10n.appearanceMode,
               style: Theme.of(context).textTheme.labelLarge,
             ),
             const SizedBox(height: 12),
             SegmentedButton<ThemeMode>(
-              segments: const [
+              segments: [
                 ButtonSegment<ThemeMode>(
                   value: ThemeMode.system,
-                  label: Text("System"),
+                  label: Text(l10n.system),
                   icon: Icon(Icons.brightness_auto),
                 ),
                 ButtonSegment<ThemeMode>(
                   value: ThemeMode.light,
-                  label: Text("Light"),
+                  label: Text(l10n.light),
                   icon: Icon(Icons.light_mode),
                 ),
                 ButtonSegment<ThemeMode>(
                   value: ThemeMode.dark,
-                  label: Text("Dark"),
+                  label: Text(l10n.dark),
                   icon: Icon(Icons.dark_mode),
                 ),
               ],
@@ -184,7 +265,10 @@ class _SettingsPageState extends State<SettingsPage> {
               },
             ),
             const SizedBox(height: 20),
-            Text("Accent Color", style: Theme.of(context).textTheme.labelLarge),
+            Text(
+              l10n.accentColor,
+              style: Theme.of(context).textTheme.labelLarge,
+            ),
             const SizedBox(height: 12),
             Wrap(
               spacing: 12,
@@ -221,15 +305,25 @@ class _SettingsPageState extends State<SettingsPage> {
                 );
               }).toList(),
             ),
+            const SizedBox(height: 32),
+            _buildSectionTitle(l10n.explore),
+            const SizedBox(height: 8),
+            SwitchListTile.adaptive(
+              contentPadding: EdgeInsets.zero,
+              title: Text(l10n.livePreviewThumbnails),
+              subtitle: Text(l10n.livePreviewThumbnailsDesc),
+              value: settings.livePreviewThumbnailsEnabled,
+              onChanged: settings.setLivePreviewThumbnailsEnabled,
+            ),
             if (isAuthenticated) ...[
               const SizedBox(height: 32),
-              _buildSectionTitle("Security"),
+              _buildSectionTitle(l10n.security),
               const SizedBox(height: 16),
               TextField(
                 controller: _oldPasswordController,
                 obscureText: true,
                 decoration: InputDecoration(
-                  labelText: "Old Password",
+                  labelText: l10n.oldPassword,
                   prefixIcon: const Icon(Icons.lock_outline),
                   border: OutlineInputBorder(
                     borderRadius: BorderRadius.circular(12),
@@ -241,7 +335,7 @@ class _SettingsPageState extends State<SettingsPage> {
                 controller: _newPasswordController,
                 obscureText: true,
                 decoration: InputDecoration(
-                  labelText: "New Password",
+                  labelText: l10n.newPassword,
                   prefixIcon: const Icon(Icons.lock_reset),
                   border: OutlineInputBorder(
                     borderRadius: BorderRadius.circular(12),
@@ -254,7 +348,7 @@ class _SettingsPageState extends State<SettingsPage> {
                 child: OutlinedButton.icon(
                   onPressed: _handleChangePassword,
                   icon: const Icon(Icons.update),
-                  label: const Text("Change Password"),
+                  label: Text(l10n.changePassword),
                   style: OutlinedButton.styleFrom(
                     shape: RoundedRectangleBorder(
                       borderRadius: BorderRadius.circular(12),
@@ -266,9 +360,9 @@ class _SettingsPageState extends State<SettingsPage> {
               SizedBox(
                 width: double.infinity,
                 child: FilledButton.tonalIcon(
-                  onPressed: auth.logout,
+                  onPressed: () => _confirmLogout(auth, l10n),
                   icon: const Icon(Icons.logout),
-                  label: const Text("Logout"),
+                  label: Text(l10n.logout),
                   style: FilledButton.styleFrom(
                     foregroundColor: Colors.redAccent,
                     padding: const EdgeInsets.symmetric(vertical: 14),
@@ -306,10 +400,7 @@ class _SettingsPageState extends State<SettingsPage> {
                     "Hightube",
                     style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
                   ),
-                  Text(
-                    "Version: 1.0.0-beta4.1",
-                    style: TextStyle(color: Colors.grey),
-                  ),
+                  Text("Version: 1.0.1", style: TextStyle(color: Colors.grey)),
                   Text(
                     "Author: Highground-Soft",
                     style: TextStyle(color: Colors.grey),

frontend/lib/providers/settings_provider.dart

@@ -12,10 +12,14 @@ class SettingsProvider with ChangeNotifier {
   String _baseUrl = _defaultUrl;
   Color _themeColor = Colors.blue;
   ThemeMode _themeMode = ThemeMode.system;
+  bool _livePreviewThumbnailsEnabled = false;
+  Locale? _locale;
 
   String get baseUrl => _baseUrl;
   Color get themeColor => _themeColor;
   ThemeMode get themeMode => _themeMode;
+  bool get livePreviewThumbnailsEnabled => _livePreviewThumbnailsEnabled;
+  Locale? get locale => _locale;
 
   SettingsProvider() {
     _loadSettings();
@@ -32,6 +36,43 @@ class SettingsProvider with ChangeNotifier {
     if (savedThemeMode != null) {
       _themeMode = _themeModeFromString(savedThemeMode);
     }
+    _livePreviewThumbnailsEnabled =
+        prefs.getBool('livePreviewThumbnailsEnabled') ?? false;
+    
+    final languageCode = prefs.getString('languageCode');
+    final scriptCode = prefs.getString('scriptCode');
+    final countryCode = prefs.getString('countryCode');
+    if (languageCode != null) {
+      _locale = Locale.fromSubtags(
+        languageCode: languageCode,
+        scriptCode: scriptCode,
+        countryCode: countryCode,
+      );
+    }
+    
+    notifyListeners();
+  }
+
+  void setLocale(Locale? newLocale) async {
+    _locale = newLocale;
+    final prefs = await SharedPreferences.getInstance();
+    if (newLocale == null) {
+      await prefs.remove('languageCode');
+      await prefs.remove('scriptCode');
+      await prefs.remove('countryCode');
+    } else {
+      await prefs.setString('languageCode', newLocale.languageCode);
+      if (newLocale.scriptCode != null) {
+        await prefs.setString('scriptCode', newLocale.scriptCode!);
+      } else {
+        await prefs.remove('scriptCode');
+      }
+      if (newLocale.countryCode != null) {
+        await prefs.setString('countryCode', newLocale.countryCode!);
+      } else {
+        await prefs.remove('countryCode');
+      }
+    }
     notifyListeners();
   }
 
@@ -56,6 +97,13 @@ class SettingsProvider with ChangeNotifier {
     notifyListeners();
   }
 
+  void setLivePreviewThumbnailsEnabled(bool enabled) async {
+    _livePreviewThumbnailsEnabled = enabled;
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setBool('livePreviewThumbnailsEnabled', enabled);
+    notifyListeners();
+  }
+
   // Also provide the RTMP URL based on the same hostname
   String get rtmpUrl {
     final uri = Uri.parse(_baseUrl);
@@ -84,6 +132,16 @@ class SettingsProvider with ChangeNotifier {
     return "$rtmpUrl/$roomId/$normalizedQuality";
   }
 
+  String thumbnailUrl(String roomId, {String? cacheBuster}) {
+    final uri = Uri.parse(_baseUrl);
+    return uri
+        .replace(
+          path: '/api/rooms/$roomId/thumbnail',
+          queryParameters: cacheBuster == null ? null : {'t': cacheBuster},
+        )
+        .toString();
+  }
+
   ThemeMode _themeModeFromString(String value) {
     switch (value) {
       case 'light':

frontend/lib/services/chat_service.dart

@@ -1,5 +1,6 @@
 import 'dart:async';
 import 'dart:convert';
+import 'package:flutter/foundation.dart';
 import 'package:web_socket_channel/web_socket_channel.dart';
 
 class ChatMessage {
@@ -38,27 +39,46 @@ class ChatMessage {
 
 class ChatService {
   WebSocketChannel? _channel;
-  final StreamController<ChatMessage> _messageController = StreamController<ChatMessage>.broadcast();
+  final StreamController<ChatMessage> _messageController =
+      StreamController<ChatMessage>.broadcast();
 
   Stream<ChatMessage> get messages => _messageController.stream;
 
   void connect(String baseUrl, String roomId, String username) {
-    final wsUri = Uri.parse(baseUrl).replace(scheme: 'ws', path: '/api/ws/room/$roomId', queryParameters: {'username': username});
+    final wsUri = Uri.parse(baseUrl).replace(
+      scheme: 'ws',
+      path: '/api/ws/room/$roomId',
+      queryParameters: {'username': username},
+    );
     _channel = WebSocketChannel.connect(wsUri);
 
-    _channel!.stream.listen((data) {
-      final json = jsonDecode(data);
-      _messageController.add(ChatMessage.fromJson(json));
-    }, onError: (err) {
-      print("[WS ERROR] $err");
-    }, onDone: () {
-      print("[WS DONE] Connection closed");
-    });
+    _channel!.stream.listen(
+      (data) {
+        final json = jsonDecode(data);
+        _messageController.add(ChatMessage.fromJson(json));
+      },
+      onError: (err) {
+        debugPrint("[WS ERROR] $err");
+      },
+      onDone: () {
+        debugPrint("[WS DONE] Connection closed");
+      },
+    );
   }
 
-  void sendMessage(String content, String username, String roomId, {String type = 'chat'}) {
+  void sendMessage(
+    String content,
+    String username,
+    String roomId, {
+    String type = 'chat',
+  }) {
     if (_channel != null) {
-      final msg = ChatMessage(type: type, username: username, content: content, roomId: roomId);
+      final msg = ChatMessage(
+        type: type,
+        username: username,
+        content: content,
+        roomId: roomId,
+      );
       _channel!.sink.add(jsonEncode(msg.toJson()));
     }
   }

frontend/lib/widgets/android_quick_stream_panel.dart

@@ -0,0 +1,477 @@
+import 'dart:async';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:permission_handler/permission_handler.dart';
+import 'package:rtmp_streaming/camera.dart';
+
+class AndroidQuickStreamPanel extends StatefulWidget {
+  final String rtmpBaseUrl;
+  final String streamKey;
+
+  const AndroidQuickStreamPanel({
+    super.key,
+    required this.rtmpBaseUrl,
+    required this.streamKey,
+  });
+
+  @override
+  State<AndroidQuickStreamPanel> createState() =>
+      _AndroidQuickStreamPanelState();
+}
+
+class _AndroidQuickStreamPanelState extends State<AndroidQuickStreamPanel> {
+  final CameraController _controller = CameraController(
+    ResolutionPreset.medium,
+    enableAudio: true,
+    androidUseOpenGL: true,
+  );
+
+  List<CameraDescription> _cameras = const [];
+  CameraDescription? _currentCamera;
+  StreamStatistics? _stats;
+  Timer? _statsTimer;
+  bool _permissionsGranted = false;
+  bool _isPreparing = true;
+  bool _isBusy = false;
+  bool _audioEnabled = true;
+  String? _statusMessage;
+
+  String get _streamUrl => '${widget.rtmpBaseUrl}/${widget.streamKey}';
+
+  bool get _isInitialized => _controller.value.isInitialized ?? false;
+  bool get _isStreaming => _controller.value.isStreamingVideoRtmp ?? false;
+
+  @override
+  void initState() {
+    super.initState();
+    _controller.addListener(_onControllerChanged);
+    _initialize();
+  }
+
+  @override
+  void dispose() {
+    _statsTimer?.cancel();
+    _controller.removeListener(_onControllerChanged);
+    _controller.dispose();
+    super.dispose();
+  }
+
+  Future<void> _initialize() async {
+    if (kIsWeb || defaultTargetPlatform != TargetPlatform.android) {
+      setState(() {
+        _isPreparing = false;
+        _statusMessage = 'Quick stream is only supported on Android.';
+      });
+      return;
+    }
+    if (!mounted) {
+      return;
+    }
+    setState(() {
+      _isPreparing = true;
+      _statusMessage = null;
+    });
+
+    final cameraStatus = await Permission.camera.request();
+    final micStatus = await Permission.microphone.request();
+    final granted = cameraStatus.isGranted && micStatus.isGranted;
+
+    if (!mounted) {
+      return;
+    }
+
+    if (!granted) {
+      setState(() {
+        _permissionsGranted = false;
+        _isPreparing = false;
+        _statusMessage =
+            'Camera and microphone permissions are required for quick streaming.';
+      });
+      return;
+    }
+
+    try {
+      final cameras = await availableCameras();
+      if (!mounted) {
+        return;
+      }
+      if (cameras.isEmpty) {
+        setState(() {
+          _permissionsGranted = true;
+          _isPreparing = false;
+          _statusMessage = 'No available cameras were found on this device.';
+        });
+        return;
+      }
+
+      _cameras = cameras;
+      _currentCamera = cameras.first;
+      await _controller.initialize(_currentCamera!);
+
+      if (!mounted) {
+        return;
+      }
+
+      setState(() {
+        _permissionsGranted = true;
+        _isPreparing = false;
+        _statusMessage = 'Ready to go live.';
+      });
+    } on CameraException catch (e) {
+      if (!mounted) {
+        return;
+      }
+      setState(() {
+        _permissionsGranted = true;
+        _isPreparing = false;
+        _statusMessage = e.description ?? e.code;
+      });
+    } catch (e) {
+      if (!mounted) {
+        return;
+      }
+      setState(() {
+        _permissionsGranted = true;
+        _isPreparing = false;
+        _statusMessage = 'Failed to initialize camera: $e';
+      });
+    }
+  }
+
+  void _onControllerChanged() {
+    if (!mounted) {
+      return;
+    }
+
+    final event = _controller.value.event;
+    final eventType = event is Map ? event['eventType']?.toString() : null;
+    if (eventType == 'rtmp_stopped' || eventType == 'camera_closing') {
+      _statsTimer?.cancel();
+      setState(() {
+        _statusMessage =
+            _controller.value.errorDescription ?? 'Streaming stopped.';
+      });
+      return;
+    }
+
+    if (eventType == 'error' || eventType == 'rtmp_retry') {
+      setState(() {
+        _statusMessage =
+            _controller.value.errorDescription ?? 'Streaming error occurred.';
+      });
+      return;
+    }
+
+    setState(() {});
+  }
+
+  Future<void> _startStreaming() async {
+    if (!_isInitialized || _isBusy) {
+      return;
+    }
+
+    setState(() {
+      _isBusy = true;
+      _statusMessage = 'Connecting to stream server...';
+    });
+
+    try {
+      await _controller.startVideoStreaming(_streamUrl, bitrate: 1500 * 1024);
+      if (_isStreaming && !_audioEnabled) {
+        await _controller.switchAudio(false);
+      }
+      _startStatsPolling();
+      if (!mounted) {
+        return;
+      }
+      setState(() => _statusMessage = 'Quick stream is live.');
+    } on CameraException catch (e) {
+      if (!mounted) {
+        return;
+      }
+      setState(() => _statusMessage = e.description ?? e.code);
+    } finally {
+      if (mounted) {
+        setState(() => _isBusy = false);
+      }
+    }
+  }
+
+  Future<void> _stopStreaming() async {
+    if (!_isStreaming || _isBusy) {
+      return;
+    }
+
+    setState(() => _isBusy = true);
+    try {
+      await _controller.stopVideoStreaming();
+      _statsTimer?.cancel();
+      if (!mounted) {
+        return;
+      }
+      setState(() {
+        _stats = null;
+        _statusMessage = 'Quick stream stopped.';
+      });
+    } on CameraException catch (e) {
+      if (!mounted) {
+        return;
+      }
+      setState(() => _statusMessage = e.description ?? e.code);
+    } finally {
+      if (mounted) {
+        setState(() => _isBusy = false);
+      }
+    }
+  }
+
+  Future<void> _switchCamera() async {
+    if (_cameras.length < 2 || !_isInitialized || _isBusy) {
+      return;
+    }
+
+    final currentIndex = _cameras.indexOf(_currentCamera!);
+    final nextCamera = _cameras[(currentIndex + 1) % _cameras.length];
+    final nextCameraName = nextCamera.name;
+    if (nextCameraName == null || nextCameraName.isEmpty) {
+      setState(
+        () => _statusMessage = 'Unable to switch camera on this device.',
+      );
+      return;
+    }
+
+    setState(() => _isBusy = true);
+    try {
+      await _controller.switchCamera(nextCameraName);
+      if (!mounted) {
+        return;
+      }
+      setState(() {
+        _currentCamera = nextCamera;
+        _statusMessage = 'Switched camera.';
+      });
+    } on CameraException catch (e) {
+      if (!mounted) {
+        return;
+      }
+      setState(() => _statusMessage = e.description ?? e.code);
+    } finally {
+      if (mounted) {
+        setState(() => _isBusy = false);
+      }
+    }
+  }
+
+  Future<void> _toggleAudio() async {
+    final nextAudioEnabled = !_audioEnabled;
+
+    if (!_isStreaming) {
+      setState(() {
+        _audioEnabled = nextAudioEnabled;
+        _statusMessage = nextAudioEnabled
+            ? 'Microphone will be enabled when streaming starts.'
+            : 'Microphone will be muted after streaming starts.';
+      });
+      return;
+    }
+
+    setState(() => _isBusy = true);
+    try {
+      await _controller.switchAudio(nextAudioEnabled);
+      if (!mounted) {
+        return;
+      }
+      setState(() {
+        _audioEnabled = nextAudioEnabled;
+        _statusMessage = nextAudioEnabled
+            ? 'Microphone enabled.'
+            : 'Microphone muted.';
+      });
+    } on CameraException catch (e) {
+      if (!mounted) {
+        return;
+      }
+      setState(() => _statusMessage = e.description ?? e.code);
+    } finally {
+      if (mounted) {
+        setState(() => _isBusy = false);
+      }
+    }
+  }
+
+  void _startStatsPolling() {
+    _statsTimer?.cancel();
+    _statsTimer = Timer.periodic(const Duration(seconds: 2), (_) async {
+      if (!_isStreaming) {
+        return;
+      }
+      try {
+        final stats = await _controller.getStreamStatistics();
+        if (!mounted) {
+          return;
+        }
+        setState(() => _stats = stats);
+      } catch (_) {
+        // Ignore transient stats failures while streaming starts up.
+      }
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (kIsWeb || defaultTargetPlatform != TargetPlatform.android) {
+      return const SizedBox.shrink();
+    }
+
+    return Card(
+      child: Padding(
+        padding: const EdgeInsets.all(16),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Row(
+              children: [
+                Icon(
+                  Icons.rocket_launch,
+                  color: Theme.of(context).colorScheme.primary,
+                ),
+                const SizedBox(width: 10),
+                Text(
+                  'Quick Stream (Experimental)',
+                  style: Theme.of(context).textTheme.titleMedium?.copyWith(
+                    fontWeight: FontWeight.bold,
+                  ),
+                ),
+              ],
+            ),
+            const SizedBox(height: 8),
+            Text(
+              'Start streaming directly from your phone camera. For advanced scenes and overlays, continue using OBS.',
+              style: Theme.of(context).textTheme.bodySmall,
+            ),
+            const SizedBox(height: 16),
+            _buildPreview(context),
+            const SizedBox(height: 12),
+            _buildStatus(context),
+            const SizedBox(height: 12),
+            Wrap(
+              spacing: 10,
+              runSpacing: 10,
+              children: [
+                FilledButton.icon(
+                  onPressed: !_permissionsGranted || _isPreparing || _isBusy
+                      ? null
+                      : _isStreaming
+                      ? _stopStreaming
+                      : _startStreaming,
+                  icon: Icon(_isStreaming ? Icons.stop_circle : Icons.wifi),
+                  label: Text(_isStreaming ? 'Stop Stream' : 'Start Stream'),
+                ),
+                OutlinedButton.icon(
+                  onPressed: _cameras.length > 1 && !_isBusy && _isInitialized
+                      ? _switchCamera
+                      : null,
+                  icon: const Icon(Icons.cameraswitch),
+                  label: const Text('Switch Camera'),
+                ),
+                OutlinedButton.icon(
+                  onPressed: _isBusy || !_permissionsGranted
+                      ? null
+                      : _toggleAudio,
+                  icon: Icon(_audioEnabled ? Icons.mic : Icons.mic_off),
+                  label: Text(_audioEnabled ? 'Mic On' : 'Mic Off'),
+                ),
+                TextButton.icon(
+                  onPressed: _isBusy ? null : _initialize,
+                  icon: const Icon(Icons.refresh),
+                  label: const Text('Reinitialize'),
+                ),
+              ],
+            ),
+            const SizedBox(height: 12),
+            Text(
+              'Target: $_streamUrl',
+              style: Theme.of(context).textTheme.bodySmall,
+            ),
+            if (_stats != null) ...[
+              const SizedBox(height: 8),
+              Text(
+                'Stats: ${_stats!.width ?? '-'}x${_stats!.height ?? '-'}  |  ${_stats!.fps ?? '-'} fps  |  ${_formatKbps(_stats!.bitrate)}  |  dropped ${_stats!.droppedVideoFrames ?? 0} video',
+                style: Theme.of(context).textTheme.bodySmall,
+              ),
+            ],
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildPreview(BuildContext context) {
+    return Container(
+      height: 220,
+      width: double.infinity,
+      decoration: BoxDecoration(
+        color: Colors.black,
+        borderRadius: BorderRadius.circular(16),
+      ),
+      clipBehavior: Clip.antiAlias,
+      child: _isPreparing
+          ? const Center(child: CircularProgressIndicator())
+          : !_permissionsGranted
+          ? _buildPreviewMessage('Grant camera and microphone permissions.')
+          : !_isInitialized
+          ? _buildPreviewMessage('Camera is not ready yet.')
+          : AspectRatio(
+              aspectRatio: _controller.value.aspectRatio,
+              child: CameraPreview(_controller),
+            ),
+    );
+  }
+
+  Widget _buildPreviewMessage(String text) {
+    return Center(
+      child: Padding(
+        padding: const EdgeInsets.all(20),
+        child: Text(
+          text,
+          style: const TextStyle(color: Colors.white70),
+          textAlign: TextAlign.center,
+        ),
+      ),
+    );
+  }
+
+  Widget _buildStatus(BuildContext context) {
+    final statusText =
+        _statusMessage ??
+        (_isStreaming ? 'Quick stream is live.' : 'Waiting for camera.');
+
+    return Container(
+      width: double.infinity,
+      padding: const EdgeInsets.all(12),
+      decoration: BoxDecoration(
+        color: Theme.of(context).colorScheme.surfaceContainerHighest,
+        borderRadius: BorderRadius.circular(12),
+      ),
+      child: Row(
+        children: [
+          Icon(
+            _isStreaming ? Icons.circle : Icons.info_outline,
+            size: _isStreaming ? 12 : 18,
+            color: _isStreaming ? Colors.red : null,
+          ),
+          const SizedBox(width: 10),
+          Expanded(child: Text(statusText)),
+        ],
+      ),
+    );
+  }
+
+  String _formatKbps(int? bitrate) {
+    if (bitrate == null || bitrate <= 0) {
+      return '- kbps';
+    }
+    return '${(bitrate / 1000).toStringAsFixed(0)} kbps';
+  }
+}

frontend/lib/widgets/web_stream_player_stub.dart

@@ -2,11 +2,13 @@ import 'package:flutter/material.dart';
 
 class WebStreamPlayer extends StatelessWidget {
   final String streamUrl;
+  final double volume;
   final int? refreshToken;
 
   const WebStreamPlayer({
     super.key,
     required this.streamUrl,
+    required this.volume,
     this.refreshToken,
   });
 

frontend/lib/widgets/web_stream_player_web.dart

@@ -1,3 +1,5 @@
+// ignore_for_file: avoid_web_libraries_in_flutter, deprecated_member_use
+
 import 'dart:html' as html;
 import 'dart:ui_web' as ui_web;
 
@@ -5,11 +7,13 @@ import 'package:flutter/material.dart';
 
 class WebStreamPlayer extends StatefulWidget {
   final String streamUrl;
+  final double volume;
   final int? refreshToken;
 
   const WebStreamPlayer({
     super.key,
     required this.streamUrl,
+    required this.volume,
     this.refreshToken,
   });
 
@@ -19,6 +23,7 @@ class WebStreamPlayer extends StatefulWidget {
 
 class _WebStreamPlayerState extends State<WebStreamPlayer> {
   late final String _viewType;
+  html.IFrameElement? _iframe;
 
   @override
   void initState() {
@@ -29,15 +34,30 @@ class _WebStreamPlayerState extends State<WebStreamPlayer> {
     ui_web.platformViewRegistry.registerViewFactory(_viewType, (int viewId) {
       final iframe = html.IFrameElement()
         ..src =
-            'flv_player.html?v=$cacheBuster&src=${Uri.encodeComponent(widget.streamUrl)}'
+            'flv_player.html?v=$cacheBuster'
+            '&src=${Uri.encodeComponent(widget.streamUrl)}'
+            '&volume=${widget.volume}'
         ..style.border = '0'
         ..style.width = '100%'
         ..style.height = '100%'
+        ..style.pointerEvents = 'none'
         ..allow = 'autoplay; fullscreen';
+      _iframe = iframe;
       return iframe;
     });
   }
 
+  @override
+  void didUpdateWidget(covariant WebStreamPlayer oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    if (oldWidget.volume != widget.volume) {
+      _iframe?.contentWindow?.postMessage({
+        'type': 'setVolume',
+        'value': widget.volume,
+      }, '*');
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     return HtmlElementView(viewType: _viewType);

frontend/pubspec.lock

@@ -150,6 +150,11 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "6.0.0"
+  flutter_localizations:
+    dependency: "direct main"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -216,6 +221,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.8.0"
+  intl:
+    dependency: "direct main"
+    description:
+      name: intl
+      sha256: "3df61194eb431efc39c4ceba583b95633a403f46c9fd341e550ce0bfa50e9aa5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.20.2"
   json_annotation:
     dependency: transitive
     description:
@@ -368,6 +381,54 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.3.0"
+  permission_handler:
+    dependency: "direct main"
+    description:
+      name: permission_handler
+      sha256: bc917da36261b00137bbc8896bf1482169cd76f866282368948f032c8c1caae1
+      url: "https://pub.dev"
+    source: hosted
+    version: "12.0.1"
+  permission_handler_android:
+    dependency: transitive
+    description:
+      name: permission_handler_android
+      sha256: "1e3bc410ca1bf84662104b100eb126e066cb55791b7451307f9708d4007350e6"
+      url: "https://pub.dev"
+    source: hosted
+    version: "13.0.1"
+  permission_handler_apple:
+    dependency: transitive
+    description:
+      name: permission_handler_apple
+      sha256: f000131e755c54cf4d84a5d8bd6e4149e262cc31c5a8b1d698de1ac85fa41023
+      url: "https://pub.dev"
+    source: hosted
+    version: "9.4.7"
+  permission_handler_html:
+    dependency: transitive
+    description:
+      name: permission_handler_html
+      sha256: "38f000e83355abb3392140f6bc3030660cfaef189e1f87824facb76300b4ff24"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.3+5"
+  permission_handler_platform_interface:
+    dependency: transitive
+    description:
+      name: permission_handler_platform_interface
+      sha256: eb99b295153abce5d683cac8c02e22faab63e50679b937fa1bf67d58bb282878
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.3.0"
+  permission_handler_windows:
+    dependency: transitive
+    description:
+      name: permission_handler_windows
+      sha256: "1a790728016f79a41216d88672dbc5df30e686e811ad4e698bfc51f76ad91f1e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.2.1"
   petitparser:
     dependency: transitive
     description:
@@ -416,6 +477,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.2.0"
+  rtmp_streaming:
+    dependency: "direct main"
+    description:
+      name: rtmp_streaming
+      sha256: f54c0c0443df65086d2936b0f3432fbb351fc35bffba69aa2b004ee7ecf45d40
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.5"
   shared_preferences:
     dependency: "direct main"
     description:

frontend/pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 1.0.0-beta4.1
+version: 1.0.1
 
 environment:
   sdk: ^3.11.1
@@ -40,6 +40,11 @@ dependencies:
   video_player: ^2.11.1
   fvp: ^0.35.2
   web_socket_channel: ^3.0.3
+  permission_handler: ^12.0.1
+  rtmp_streaming: ^1.0.5
+  intl: ^0.20.2
+  flutter_localizations:
+    sdk: flutter
 
 dev_dependencies:
   flutter_test:
@@ -73,6 +78,7 @@ flutter_launcher_icons:
 
 # The following section is specific to Flutter packages.
 flutter:
+  generate: true
 
   # The following line ensures that the Material Icons font is
   # included with your application, so that you can use the icons in

frontend/web/flv_player.html

@@ -45,14 +45,21 @@
   <script src="flv.min.js"></script>
 </head>
 <body>
-  <video id="player" controls autoplay muted playsinline></video>
+  <video id="player" autoplay muted playsinline></video>
   <div id="message">Loading live stream...</div>
   <script>
     const params = new URLSearchParams(window.location.search);
     const streamUrl = params.get('src');
+    const initialVolume = Number.parseFloat(params.get('volume') || '1');
     const video = document.getElementById('player');
     const message = document.getElementById('message');
 
+    function applyVolume(value) {
+      const normalized = Number.isFinite(value) ? Math.max(0, Math.min(1, value)) : 1;
+      video.volume = normalized;
+      video.muted = normalized === 0;
+    }
+
     function showMessage(text) {
       video.style.display = 'none';
       message.style.display = 'flex';
@@ -66,12 +73,15 @@
     } else if (!flvjs.isSupported()) {
       showMessage('This browser does not support FLV playback.');
     } else {
+      applyVolume(initialVolume);
+
       const player = flvjs.createPlayer({
         type: 'flv',
         url: streamUrl,
         isLive: true,
       }, {
         enableWorker: false,
+        enableStashBuffer: false,
         stashInitialSize: 128,
       });
 
@@ -79,6 +89,24 @@
       player.load();
       player.play().catch(() => {});
 
+      // Live latency auto-catchup logic
+      video.addEventListener('timeupdate', function() {
+        if (video.buffered.length > 0) {
+          const end = video.buffered.end(video.buffered.length - 1);
+          const diff = end - video.currentTime;
+          if (diff > 5) {
+            // If way behind, jump directly close to the live edge
+            video.currentTime = end - 1.0;
+          } else if (diff > 1.5) {
+            // Speed up slightly to catch up
+            video.playbackRate = 1.15;
+          } else {
+            // Reset to normal speed
+            video.playbackRate = 1.0;
+          }
+        }
+      });
+
       player.on(flvjs.Events.ERROR, function(errorType, detail, info) {
         const parts = ['Live stream failed to load.'];
         if (errorType) parts.push('type=' + errorType);
@@ -90,6 +118,13 @@
       video.style.display = 'block';
       message.style.display = 'none';
 
+      window.addEventListener('message', function(event) {
+        const data = event.data || {};
+        if (data.type === 'setVolume') {
+          applyVolume(Number(data.value));
+        }
+      });
+
       window.addEventListener('beforeunload', function() {
         player.destroy();
       });

website/index.html

@@ -0,0 +1,255 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta
+      name="description"
+      content="Hightube is an open source, cross-platform live streaming platform built with Flutter and Go."
+    />
+    <title>Hightube | Open Source Live Streaming Platform</title>
+    <link rel="icon" href="assets/hightube-icon.png" />
+    <link rel="stylesheet" href="styles.css" />
+  </head>
+  <body>
+    <header class="topbar">
+      <a class="brand" href="#home" aria-label="Hightube home">
+        <img src="assets/hightube-icon.png" alt="" />
+        <span>Hightube</span>
+      </a>
+      <nav class="nav" aria-label="Primary navigation">
+        <a href="#architecture">Architecture</a>
+        <a href="#features">Features</a>
+        <a href="#downloads">Downloads</a>
+        <a href="#source">Source</a>
+      </nav>
+    </header>
+
+    <main id="home">
+      <section class="hero">
+        <div class="hero-copy">
+          <p class="eyebrow">Flutter + Go live streaming stack</p>
+          <h1>Hightube</h1>
+          <p class="lead">
+            An open source live streaming platform designed for creators,
+            private communities, classrooms, labs, and self-hosted media
+            services.
+          </p>
+          <div class="actions">
+            <a class="button primary" href="#downloads">Download builds</a>
+            <a
+              class="button secondary"
+              href="https://git.nudt.space/Highground-Soft/Hightube.git"
+              rel="noopener"
+            >
+              View source
+            </a>
+          </div>
+        </div>
+        <div class="hero-panel" aria-label="Hightube platform overview">
+          <div class="device-window">
+            <div class="window-bar">
+              <span></span>
+              <span></span>
+              <span></span>
+            </div>
+            <div class="stream-preview">
+              <div class="live-badge">LIVE</div>
+              <div class="play-symbol"></div>
+            </div>
+            <div class="stats-grid">
+              <div>
+                <strong>Flutter</strong>
+                <span>Client UI</span>
+              </div>
+              <div>
+                <strong>Go</strong>
+                <span>Backend API</span>
+              </div>
+              <div>
+                <strong>RTMP</strong>
+                <span>Streaming</span>
+              </div>
+              <div>
+                <strong>Open</strong>
+                <span>Source</span>
+              </div>
+            </div>
+          </div>
+        </div>
+      </section>
+
+      <section id="architecture" class="section">
+        <div class="section-heading">
+          <p class="eyebrow">Architecture</p>
+          <h2>Built with Flutter clients and a Go streaming backend</h2>
+          <p>
+            Hightube separates a portable client experience from a compact,
+            self-hostable backend, keeping deployment simple while leaving room
+            for native desktop, mobile, and web clients.
+          </p>
+        </div>
+        <div class="architecture-grid">
+          <article class="architecture-card">
+            <div class="icon">F</div>
+            <h3>Flutter frontends</h3>
+            <p>
+              One UI technology stack targets Linux, Android, Web, and future
+              desktop builds with consistent interaction patterns.
+            </p>
+          </article>
+          <article class="architecture-card">
+            <div class="icon">G</div>
+            <h3>Go backend</h3>
+            <p>
+              The server handles API requests, authentication, live room state,
+              RTMP publishing, HTTP-FLV playback, chat, and monitoring.
+            </p>
+          </article>
+          <article class="architecture-card">
+            <div class="icon">S</div>
+            <h3>Self-hosted streaming</h3>
+            <p>
+              Deploy the server on your own Linux host and connect compatible
+              broadcasters such as OBS through standard RTMP workflows.
+            </p>
+          </article>
+        </div>
+      </section>
+
+      <section id="features" class="section feature-band">
+        <div class="section-heading">
+          <p class="eyebrow">Project highlights</p>
+          <h2>Open, free, and cross-platform by design</h2>
+        </div>
+        <div class="feature-list">
+          <div class="feature-item">
+            <h3>Open source freedom</h3>
+            <p>
+              Read, modify, build, and deploy the platform from source without
+              vendor lock-in.
+            </p>
+          </div>
+          <div class="feature-item">
+            <h3>Cross-platform clients</h3>
+            <p>
+              Current builds include Linux, Web, and Android client packages,
+              with Windows builds planned later.
+            </p>
+          </div>
+          <div class="feature-item">
+            <h3>Practical live features</h3>
+            <p>
+              Live rooms, RTMP publishing, HTTP-FLV playback, multi-quality
+              transcoding, chat, danmaku-style messages, and admin monitoring.
+            </p>
+          </div>
+          <div class="feature-item">
+            <h3>Small deployment surface</h3>
+            <p>
+              The Go server uses a lightweight runtime model and can be deployed
+              as a single Linux server component.
+            </p>
+          </div>
+        </div>
+      </section>
+
+      <section id="downloads" class="section">
+        <div class="section-heading">
+          <p class="eyebrow">Downloads</p>
+          <h2>Get the current executable builds</h2>
+          <p>
+            These files are hosted in the local website resources directory.
+            Windows server and client builds will be added later. Apple device
+            builds are not provided at this time.
+          </p>
+        </div>
+        <div class="download-grid">
+          <article class="download-card available">
+            <span class="status">Available</span>
+            <h3>Linux server</h3>
+            <p>Backend service for self-hosted streaming deployments.</p>
+            <a
+              class="download-link"
+              href="resources/hightube-server/hightube-server_amd64_v1.0.0"
+              download
+            >
+              Download Linux server
+            </a>
+          </article>
+          <article class="download-card available">
+            <span class="status">Available</span>
+            <h3>Linux client</h3>
+            <p>Desktop Flutter client packaged as an AppImage.</p>
+            <a
+              class="download-link"
+              href="resources/hightube-client/hightube-linux-amd64-v1.0.0.AppImage"
+              download
+            >
+              Download Linux AppImage
+            </a>
+          </article>
+          <article class="download-card available">
+            <span class="status">Available</span>
+            <h3>Android client</h3>
+            <p>ARM64 Android APK build for mobile viewing and interaction.</p>
+            <a
+              class="download-link"
+              href="resources/hightube-client/hightube-android-arm64-v8a-v1.0.0.apk"
+              download
+            >
+              Download Android APK
+            </a>
+          </article>
+          <article class="download-card available">
+            <span class="status">Available</span>
+            <h3>Web client</h3>
+            <p>Static web build archive for hosting the Flutter web frontend.</p>
+            <a
+              class="download-link"
+              href="resources/hightube-client/hightube-web-v1.0.0.tar.gz"
+              download
+            >
+              Download Web archive
+            </a>
+          </article>
+          <article class="download-card planned">
+            <span class="status muted">Coming later</span>
+            <h3>Windows server</h3>
+            <p>Planned server executable for Windows environments.</p>
+          </article>
+          <article class="download-card planned">
+            <span class="status muted">Coming later</span>
+            <h3>Windows client</h3>
+            <p>Planned desktop client build for Windows users.</p>
+          </article>
+        </div>
+      </section>
+
+      <section id="source" class="section source-section">
+        <div>
+          <p class="eyebrow">Source code</p>
+          <h2>Build it, audit it, host it your way</h2>
+          <p>
+            Hightube is developed as an open source project. Clone the source,
+            inspect the Flutter and Go code, build your own binaries, and adapt
+            it for your own live platform.
+          </p>
+        </div>
+        <a
+          class="button primary"
+          href="https://git.nudt.space/Highground-Soft/Hightube.git"
+          rel="noopener"
+        >
+          Open repository
+        </a>
+      </section>
+    </main>
+
+    <footer class="footer">
+      <span>Hightube</span>
+      <span>Built with ❤️ by HighGround-soft 2026</span>
+      <span>Open Source Live Platform</span>
+    </footer>
+  </body>
+</html>

website/styles.css

@@ -0,0 +1,495 @@
+:root {
+  color-scheme: light;
+  --primary: #0b57d0;
+  --on-primary: #ffffff;
+  --primary-container: #d7e3ff;
+  --secondary: #565f71;
+  --tertiary: #705575;
+  --surface: #fbfcff;
+  --surface-container: #eef3fb;
+  --surface-container-high: #e5ebf5;
+  --outline: #727782;
+  --text: #191c20;
+  --muted: #42474f;
+  --success: #146c2e;
+  --warning: #7a5900;
+  --shadow: 0 24px 60px rgba(11, 87, 208, 0.16);
+}
+
+* {
+  box-sizing: border-box;
+}
+
+html {
+  scroll-behavior: smooth;
+}
+
+body {
+  margin: 0;
+  min-width: 320px;
+  background: var(--surface);
+  color: var(--text);
+  font-family:
+    Inter, Roboto, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
+    sans-serif;
+  line-height: 1.6;
+}
+
+a {
+  color: inherit;
+}
+
+.topbar {
+  position: sticky;
+  top: 0;
+  z-index: 10;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 24px;
+  padding: 14px clamp(20px, 5vw, 72px);
+  background: rgba(251, 252, 255, 0.68);
+  border-bottom: 1px solid rgba(114, 119, 130, 0.18);
+  box-shadow: 0 12px 36px rgba(11, 87, 208, 0.08);
+  -webkit-backdrop-filter: blur(22px) saturate(160%);
+  backdrop-filter: blur(22px) saturate(160%);
+}
+
+.brand {
+  display: inline-flex;
+  align-items: center;
+  gap: 10px;
+  color: var(--text);
+  font-weight: 800;
+  text-decoration: none;
+}
+
+.brand img {
+  width: 36px;
+  height: 36px;
+  border-radius: 10px;
+}
+
+.nav {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+}
+
+.nav a {
+  min-height: 40px;
+  padding: 8px 14px;
+  border-radius: 20px;
+  color: var(--muted);
+  font-size: 0.94rem;
+  font-weight: 650;
+  text-decoration: none;
+}
+
+.nav a:hover {
+  background: var(--surface-container);
+  color: var(--primary);
+}
+
+.hero {
+  display: grid;
+  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
+  gap: clamp(28px, 6vw, 84px);
+  align-items: center;
+  min-height: calc(100vh - 68px);
+  padding: clamp(48px, 7vw, 96px) clamp(20px, 5vw, 72px);
+}
+
+.hero-copy {
+  max-width: 680px;
+}
+
+.eyebrow {
+  margin: 0 0 12px;
+  color: var(--primary);
+  font-size: 0.85rem;
+  font-weight: 800;
+  letter-spacing: 0.08em;
+  text-transform: uppercase;
+}
+
+h1,
+h2,
+h3,
+p {
+  overflow-wrap: anywhere;
+}
+
+h1 {
+  margin: 0;
+  color: var(--text);
+  font-size: clamp(3.5rem, 11vw, 8rem);
+  line-height: 0.9;
+  letter-spacing: 0;
+}
+
+h2 {
+  margin: 0;
+  font-size: clamp(2rem, 4vw, 3.5rem);
+  line-height: 1.05;
+  letter-spacing: 0;
+}
+
+h3 {
+  margin: 0;
+  font-size: 1.2rem;
+  line-height: 1.2;
+  letter-spacing: 0;
+}
+
+.lead {
+  max-width: 620px;
+  margin: 28px 0 0;
+  color: var(--muted);
+  font-size: clamp(1.1rem, 2vw, 1.35rem);
+}
+
+.actions {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 12px;
+  margin-top: 34px;
+}
+
+.button,
+.download-link {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  min-height: 48px;
+  padding: 12px 22px;
+  border-radius: 24px;
+  font-weight: 800;
+  text-decoration: none;
+  transition:
+    transform 160ms ease,
+    box-shadow 160ms ease,
+    background 160ms ease;
+}
+
+.button:hover,
+.download-link:hover {
+  transform: translateY(-1px);
+}
+
+.primary {
+  background: var(--primary);
+  color: var(--on-primary);
+  box-shadow: 0 10px 24px rgba(11, 87, 208, 0.22);
+}
+
+.secondary {
+  background: var(--primary-container);
+  color: #001b3f;
+}
+
+.hero-panel {
+  display: flex;
+  justify-content: center;
+}
+
+.device-window {
+  width: min(100%, 560px);
+  overflow: hidden;
+  border: 1px solid rgba(114, 119, 130, 0.32);
+  border-radius: 28px;
+  background: var(--surface-container);
+  box-shadow: var(--shadow);
+}
+
+.window-bar {
+  display: flex;
+  gap: 8px;
+  padding: 16px 18px;
+  border-bottom: 1px solid rgba(114, 119, 130, 0.24);
+}
+
+.window-bar span {
+  width: 12px;
+  height: 12px;
+  border-radius: 50%;
+  background: var(--outline);
+}
+
+.window-bar span:first-child {
+  background: #ba1a1a;
+}
+
+.window-bar span:nth-child(2) {
+  background: #a46700;
+}
+
+.window-bar span:nth-child(3) {
+  background: #146c2e;
+}
+
+.stream-preview {
+  position: relative;
+  display: grid;
+  min-height: 280px;
+  place-items: center;
+  background:
+    linear-gradient(135deg, rgba(11, 87, 208, 0.94), rgba(112, 85, 117, 0.9)),
+    radial-gradient(circle at 30% 30%, #d7e3ff, transparent 32%);
+}
+
+.live-badge {
+  position: absolute;
+  top: 18px;
+  left: 18px;
+  padding: 6px 12px;
+  border-radius: 16px;
+  background: #ba1a1a;
+  color: #ffffff;
+  font-size: 0.8rem;
+  font-weight: 900;
+}
+
+.play-symbol {
+  width: 86px;
+  height: 86px;
+  border-radius: 50%;
+  background: rgba(255, 255, 255, 0.88);
+  clip-path: polygon(28% 18%, 28% 82%, 82% 50%);
+}
+
+.stats-grid {
+  display: grid;
+  grid-template-columns: repeat(4, 1fr);
+  gap: 1px;
+  background: rgba(114, 119, 130, 0.24);
+}
+
+.stats-grid div {
+  min-width: 0;
+  padding: 18px 14px;
+  background: var(--surface);
+}
+
+.stats-grid strong,
+.stats-grid span {
+  display: block;
+}
+
+.stats-grid strong {
+  color: var(--primary);
+  font-size: 1.02rem;
+}
+
+.stats-grid span {
+  color: var(--muted);
+  font-size: 0.88rem;
+}
+
+.section {
+  padding: clamp(64px, 8vw, 112px) clamp(20px, 5vw, 72px);
+}
+
+.section-heading {
+  max-width: 820px;
+  margin-bottom: 32px;
+}
+
+.section-heading p:not(.eyebrow) {
+  max-width: 760px;
+  color: var(--muted);
+  font-size: 1.06rem;
+}
+
+.architecture-grid,
+.download-grid {
+  display: grid;
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+  gap: 18px;
+}
+
+.architecture-card,
+.download-card {
+  min-width: 0;
+  padding: 24px;
+  border: 1px solid rgba(114, 119, 130, 0.24);
+  border-radius: 24px;
+  background: var(--surface-container);
+}
+
+.architecture-card .icon {
+  display: grid;
+  width: 48px;
+  height: 48px;
+  margin-bottom: 20px;
+  place-items: center;
+  border-radius: 16px;
+  background: var(--primary);
+  color: var(--on-primary);
+  font-weight: 900;
+}
+
+.architecture-card p,
+.download-card p,
+.feature-item p,
+.source-section p {
+  color: var(--muted);
+}
+
+.feature-band {
+  background: var(--surface-container);
+}
+
+.feature-list {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 1px;
+  overflow: hidden;
+  border: 1px solid rgba(114, 119, 130, 0.24);
+  border-radius: 28px;
+  background: rgba(114, 119, 130, 0.24);
+}
+
+.feature-item {
+  min-width: 0;
+  padding: 28px;
+  background: var(--surface);
+}
+
+.download-grid {
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+}
+
+.download-card {
+  display: flex;
+  min-height: 240px;
+  flex-direction: column;
+  align-items: flex-start;
+}
+
+.status {
+  margin-bottom: 18px;
+  padding: 5px 10px;
+  border-radius: 14px;
+  background: rgba(20, 108, 46, 0.12);
+  color: var(--success);
+  font-size: 0.78rem;
+  font-weight: 850;
+}
+
+.status.muted {
+  background: rgba(122, 89, 0, 0.12);
+  color: var(--warning);
+}
+
+.download-link {
+  margin-top: auto;
+  background: var(--primary);
+  color: var(--on-primary);
+}
+
+.planned {
+  background: var(--surface-container-high);
+}
+
+.source-section {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 24px;
+  background: #001b3f;
+  color: #ffffff;
+}
+
+.source-section .eyebrow,
+.source-section p {
+  color: #d7e3ff;
+}
+
+.source-section div {
+  max-width: 820px;
+}
+
+.footer {
+  display: grid;
+  grid-template-columns: 1fr auto 1fr;
+  align-items: center;
+  gap: 16px;
+  padding: 28px clamp(20px, 5vw, 72px);
+  background: #001533;
+  color: #d7e3ff;
+  font-size: 0.92rem;
+}
+
+.footer span:nth-child(2) {
+  text-align: center;
+}
+
+.footer span:last-child {
+  text-align: right;
+}
+
+@media (max-width: 900px) {
+  .topbar {
+    align-items: flex-start;
+    flex-direction: column;
+  }
+
+  .nav {
+    width: 100%;
+    overflow-x: auto;
+    padding-bottom: 2px;
+  }
+
+  .hero {
+    grid-template-columns: 1fr;
+    min-height: auto;
+  }
+
+  .architecture-grid,
+  .download-grid {
+    grid-template-columns: 1fr 1fr;
+  }
+
+  .stats-grid {
+    grid-template-columns: repeat(2, 1fr);
+  }
+
+  .source-section {
+    align-items: flex-start;
+    flex-direction: column;
+  }
+}
+
+@media (max-width: 640px) {
+  .hero,
+  .section {
+    padding-right: 16px;
+    padding-left: 16px;
+  }
+
+  .architecture-grid,
+  .download-grid,
+  .feature-list {
+    grid-template-columns: 1fr;
+  }
+
+  .actions,
+  .button,
+  .download-link {
+    width: 100%;
+  }
+
+  .stream-preview {
+    min-height: 220px;
+  }
+
+  .footer {
+    grid-template-columns: 1fr;
+  }
+
+  .footer span,
+  .footer span:last-child {
+    text-align: left;
+  }
+}