fix: video stuck on still frame after long pause

close #536

lib/mpv/player/player_native.dart

@@ -282,8 +282,7 @@ class PlayerNative extends PlayerBase {
   Future<void> updateFrame() async {
     checkDisposed();
     if (!initialized) return;
-    // Only iOS and macOS use Metal layer that needs frame updates
+    if (Platform.isIOS || Platform.isMacOS || Platform.isLinux) {
-    if (Platform.isIOS || Platform.isMacOS) {
       await methodChannel.invokeMethod('updateFrame');
     }
   }

lib/screens/video_player_screen.dart

@@ -1698,6 +1698,10 @@ class VideoPlayerScreenState extends State<VideoPlayerScreen> with WidgetsBindin
     // Toggle wakelock based on playback state
     if (isPlaying) {
       WakelockPlus.enable();
+      // Force a texture refresh on resume to unstick stale frames
+      // (Linux/macOS texture registrars can miss frame-available
+      // notifications after extended pause periods)
+      player?.updateFrame();
     } else {
       WakelockPlus.disable();
     }

lib/services/playback_progress_tracker.dart

@@ -43,6 +43,9 @@ class PlaybackProgressTracker {
   /// Timer ticks to skip before retrying after failures (exponential backoff).
   int _ticksToSkip = 0;
 
+  /// Counts timer ticks while paused to send periodic "paused" heartbeats.
+  int _pausedTickCounter = 0;
+
   PlaybackProgressTracker({
     required this.client,
     required this.metadata,
@@ -70,6 +73,7 @@ class PlaybackProgressTracker {
 
     _progressTimer = Timer.periodic(updateInterval, (timer) {
       if (player.state.playing) {
+        _pausedTickCounter = 0;
         // Skip ticks when backing off after consecutive failures to avoid
         // flooding the network with doomed requests during an outage.
         if (_ticksToSkip > 0) {
@@ -77,6 +81,18 @@ class PlaybackProgressTracker {
           return;
         }
         _sendProgress('playing');
+      } else {
+        // Send periodic "paused" updates to keep the Plex session alive
+        // (~60s with default 10s interval)
+        _pausedTickCounter++;
+        if (_pausedTickCounter >= 6) {
+          _pausedTickCounter = 0;
+          if (_ticksToSkip > 0) {
+            _ticksToSkip--;
+            return;
+          }
+          _sendProgress('paused');
+        }
       }
     });
 

linux/runner/mpv/mpv_plugin.cc

@@ -324,6 +324,11 @@ static void mpv_plugin_handle_method_call(FlMethodChannel* channel,
 
       response = FL_METHOD_RESPONSE(fl_method_success_response_new(nullptr));
     }
+  } else if (strcmp(method, "updateFrame") == 0) {
+    if (self->visible && self->texture) {
+      mpv_texture_mark_frame_available(self->texture);
+    }
+    response = FL_METHOD_RESPONSE(fl_method_success_response_new(nullptr));
   } else if (strcmp(method, "isInitialized") == 0) {
     gboolean initialized = self->player && self->initialized;
     response = FL_METHOD_RESPONSE(