feat: implement streaming handler with FFmpeg-based live and VOD HLS transcoding support

bin/api/streaming_handler.dart

@@ -562,51 +562,113 @@ Handler createRecordingStreamHandler(
 }) {
   final router = Router();
 
-  router.get('/<streamId>.mkv', (Request request, String streamId) async {
+  router.get('/<streamId>/playlist.m3u8', (Request request, String streamId) async {
     final recording = db.getRecordingById(streamId);
     if (recording == null || recording.filePath == null) {
       return Response.notFound('Recording or file not found');
     }
 
     final targetUrl = recording.filePath!;
-    final file = File(targetUrl);
+    if (!File(targetUrl).existsSync()) {
-    if (!file.existsSync()) {
       return Response.notFound('Physical recording file not found');
     }
 
-    final fileStat = file.statSync();
+    final streamDir = Directory('${_hlsTempDir.path}/rec_$streamId');
-    final fileSize = fileStat.size;
-    final rangeHeader = request.headers['range'];
 
-    if (rangeHeader != null && rangeHeader.startsWith('bytes=')) {
+    if (_vodProcesses.containsKey('rec_$streamId')) {
-      final parts = rangeHeader.substring(6).split('-');
+      final existingProcess = _vodProcesses['rec_$streamId']!;
-      var start = int.tryParse(parts[0]) ?? 0;
+      final playlistFile = File('${streamDir.path}/playlist.m3u8');
-      var end = (parts.length > 1 && parts[1].isNotEmpty) ? int.tryParse(parts[1]) : null;
-      end ??= fileSize - 1;
       
-      if (start >= fileSize || end >= fileSize || start > end) {
+      if (playlistFile.existsSync() && playlistFile.readAsStringSync().contains('.ts')) {
-        return Response(416, headers: {'Content-Range': 'bytes */$fileSize'});
+        return Response.ok(
+          playlistFile.openRead(),
+          headers: {
+            'Content-Type': 'application/vnd.apple.mpegurl',
+            'Access-Control-Allow-Origin': '*',
+            'Cache-Control': 'no-cache',
+          },
+        );
       }
       
-      final contentLength = end - start + 1;
+      try { existingProcess.kill(); } catch (_) {}
-      final stream = file.openRead(start, end + 1);
+      _vodProcesses.remove('rec_$streamId');
+      if (streamDir.existsSync()) streamDir.deleteSync(recursive: true);
+    }
 
-      return Response(206, body: stream, headers: {
+    if (!_vodProcesses.containsKey('rec_$streamId')) {
-        'Content-Type': 'video/x-matroska',
+      if (streamDir.existsSync()) streamDir.deleteSync(recursive: true);
-        'Accept-Ranges': 'bytes',
+      streamDir.createSync(recursive: true);
-        'Content-Length': contentLength.toString(),
+
-        'Content-Range': 'bytes $start-$end/$fileSize',
+      final useNvidiaGpu = isGpuEnabled?.call() ?? _isNvidiaGpuEnabled();
-        'Access-Control-Allow-Origin': '*',
+      
+      final ffmpegArgs = <String>[
+        '-hide_banner', '-loglevel', 'warning',
+        if (useNvidiaGpu) ...['-hwaccel', 'cuda'],
+        '-i', targetUrl,
+      ];
+
+      if (useNvidiaGpu) {
+        ffmpegArgs.addAll([
+          '-c:v', 'h264_nvenc', '-preset', 'p4', '-tune', 'hq',
+          '-rc', 'cbr', '-b:v', '3000k', '-maxrate', '3500k', '-bufsize', '6000k',
+          '-g', '48', '-bf', '2', '-pix_fmt', 'yuv420p',
+        ]);
+      } else {
+        ffmpegArgs.addAll([
+          '-c:v', 'libx264', '-preset', 'medium', '-crf', '18',
+          '-maxrate', '12000k', '-bufsize', '24000k', '-pix_fmt', 'yuv420p',
+          '-g', '48', '-threads', '0',
+        ]);
+      }
+
+      ffmpegArgs.addAll([
+        '-c:a', 'aac', '-b:a', '192k', '-ar', '48000',
+        '-af', 'pan=stereo|FL=1.0*FL+0.707*FC+0.5*BL+0.5*SL+0.5*LFE|FR=1.0*FR+0.707*FC+0.5*BR+0.5*SR+0.5*LFE,dynaudnorm=f=150:g=15',
+        '-f', 'hls', '-hls_time', '4', '-hls_list_size', '0',
+        '-hls_playlist_type', 'vod', '-hls_allow_cache', '1',
+        '-hls_flags', 'independent_segments', '-hls_segment_type', 'mpegts',
+        '-hls_segment_filename', 'segment_%03d.ts', '-start_number', '0',
+        'playlist.m3u8',
+      ]);
+
+      Process.start(_getFFmpegPath(), ffmpegArgs, workingDirectory: streamDir.path).then((process) {
+        _vodProcesses['rec_$streamId'] = process;
+        process.stderr.transform(utf8.decoder).listen((data) => print('[FFmpeg Rec $streamId] $data'));
+        process.exitCode.then((code) {
+          _vodProcesses.remove('rec_$streamId');
+        });
       });
     }
 
+    final playlistFile = File('${streamDir.path}/playlist.m3u8');
+    int retries = 0;
+    while (retries < 60) {
+      if (playlistFile.existsSync() && playlistFile.readAsStringSync().contains('.ts')) break;
+      await Future.delayed(const Duration(milliseconds: 500));
+      retries++;
+    }
+
+    if (!playlistFile.existsSync()) return Response.internalServerError(body: 'Timeout waiting for transcoder');
+
+    return Response.ok(
+      playlistFile.openRead(),
+      headers: {
+        'Content-Type': 'application/vnd.apple.mpegurl',
+        'Access-Control-Allow-Origin': '*',
+        'Cache-Control': 'no-cache',
+      },
+    );
+  });
+
+  router.get('/<streamId>/<segment>', (Request request, String streamId, String segment) async {
+    final file = File('${_hlsTempDir.path}/rec_$streamId/$segment');
+    if (!file.existsSync()) return Response.notFound('Segment not found');
     return Response.ok(
       file.openRead(),
       headers: {
-        'Content-Type': 'video/x-matroska',
+        'Content-Type': 'video/mp2t',
-        'Accept-Ranges': 'bytes',
-        'Content-Length': fileSize.toString(),
         'Access-Control-Allow-Origin': '*',
+        'Cache-Control': 'max-age=3600',
       },
     );
   });

lib/features/iptv/screens/player_screen.dart

@@ -128,7 +128,7 @@ class _PlayerScreenState extends ConsumerState<PlayerScreen> {
           widget.containerExtension,
         );
       } else if (widget.streamType == StreamType.recording) {
-        streamUrl = '${service.backendBaseUrl}/api/recordings/stream/$currentStreamId.mkv';
+        streamUrl = '${service.backendBaseUrl}/api/recordings/stream/$currentStreamId/playlist.m3u8';
       }
 
       // Store URL for Lite Player
@@ -166,6 +166,10 @@ class _PlayerScreenState extends ConsumerState<PlayerScreen> {
       var playerSrc =
           '$playerFile?url=$encodedUrl&type=$streamTypeParam&turbo=true&v=$cacheBuster';
 
+      if (widget.streamType == StreamType.recording) {
+        playerSrc += '&is_recording=true';
+      }
+
       if (startTimeOverride != null) {
         playerSrc += '&t=$startTimeOverride';
       }

web/player.html

@@ -251,21 +251,27 @@
             }
 
             const isTurbo = urlParams.get('turbo') === 'true';
+            const isRecording = urlParams.get('is_recording') === 'true';
 
-            const hls = new Hls({
+            const hlsOptions = {
                 maxBufferLength: 120,
                 enableWorker: true,
-                liveSyncDurationCount: 10, // Buffer-First: 10 segments safety margin
-                liveMaxLatencyDurationCount: 20,
                 nudgeOffset: 0.8, // More aggressive jump over corrupted frames
                 nudgeMaxRetries: 30,
                 maxLiveSyncPlaybackRate: 1.1, // Slower catch-up to avoid chaos
-                // Stabilization
                 initialLiveManifestSize: 3, // Wait for more segments before starting
                 abrEwmaDefaultEstimate: 1000000,
                 manifestLoadingRetryDelay: 1000,
                 levelLoadingRetryDelay: 1000
-            });
+            };
+
+            // Limit live sync only for actual LIVE IPTV, not recordings
+            if (!isRecording && streamType === 'live') {
+                hlsOptions.liveSyncDurationCount = 10;
+                hlsOptions.liveMaxLatencyDurationCount = 20;
+            }
+
+            const hls = new Hls(hlsOptions);
             window.hlsInstance = hls;
             hls.loadSource(url);
             hls.attachMedia(video);