feat: Add FFmpeg audio transcoding for Dolby/AC3/EAC3 compatibility

- Add /api/transcode endpoint for audio-only transcoding
- Video passthrough (no re-encoding) for fast performance
- Audio transcode to AAC for browser compatibility
- Add 'Force Audio Transcode' setting toggle in UI
- Add ffmpeg-static as optional dependency
- Handle Electron asar.unpacked path for packaged apps

server/index.js

@@ -11,11 +11,28 @@ const PORT = process.env.PORT || 3000;
 app.use(express.json({ limit: '50mb' }));
 app.use(express.static(path.join(__dirname, '..', 'public')));
 
+// FFMPEG Configuration (optional - for transcoding support)
+try {
+    let ffmpegPath = require('ffmpeg-static');
+
+    // In packaged Electron apps, ffmpeg-static returns path inside .asar archive
+    // but the binary is actually unpacked to app.asar.unpacked
+    if (ffmpegPath && ffmpegPath.includes('app.asar')) {
+        ffmpegPath = ffmpegPath.replace('app.asar', 'app.asar.unpacked');
+    }
+
+    app.locals.ffmpegPath = ffmpegPath;
+    console.log('FFmpeg binary configured at:', ffmpegPath);
+} catch (err) {
+    console.warn('FFmpeg not available - transcoding will be disabled. Install ffmpeg-static for transcoding support.');
+}
+
 // API Routes
 app.use('/api/sources', require('./routes/sources'));
 app.use('/api/proxy', require('./routes/proxy'));
 app.use('/api/channels', require('./routes/channels'));
 app.use('/api/favorites', require('./routes/favorites'));
+app.use('/api/transcode', require('./routes/transcode'));
 
 // SPA fallback - serve index.html for all non-API routes
 app.get('*', (req, res) => {