Instancia transcoder t2: snapshot

2026-07-13 15:20:15 +00:00
commit 257e94ef95
69 changed files with 28226 additions and 0 deletions
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+const express = require('express');
+const router = express.Router();
+const { spawn } = require('child_process');
+const db = require('../db');
+
+/**
+ * Remux stream (container conversion only)
+ * GET /api/remux?url=...
+ * 
+ * Remuxes MPEG-TS to fragmented MP4 for browser playback.
+ * This is a lightweight operation - no video/audio re-encoding.
+ * Use this for raw .ts streams that browsers can't play directly.
+ * 
+ * Note: This does NOT fix Dolby/AC3 audio issues - use /api/transcode for that.
+ */
+router.get('/', async (req, res) => {
+    const { url } = req.query;
+    if (!url) {
+        return res.status(400).json({ error: 'URL parameter is required' });
+    }
+
+    const ffmpegPath = req.app.locals.ffmpegPath || 'ffmpeg';
+
+    // Get User-Agent from settings
+    const settings = await db.settings.get();
+    const userAgent = db.getUserAgent(settings);
+
+    console.log(`[Remux] Starting remux for: ${url}`);
+    console.log(`[Remux] Using User-Agent: ${settings.userAgentPreset}`);
+
+    // FFmpeg arguments for pure remux (no encoding)
+    // Very lightweight - just changes container from TS to fragmented MP4
+    const args = [
+        '-hide_banner',
+        '-loglevel', 'warning',
+        '-user_agent', userAgent,
+        '-user_agent', userAgent,
+        // Standard probe size to handle complex containers (MKV) correctly
+        '-probesize', '5000000',
+        '-analyzeduration', '5000000',
+        // Error resilience: discard corrupt packets, generate timestamps, ignore DTS, no buffering
+        '-fflags', '+genpts+discardcorrupt+igndts+nobuffer',
+        // Ignore errors in stream and continue
+        '-err_detect', 'ignore_err',
+        // Limit max demux delay to prevent buffering issues with bad timestamps
+        '-max_delay', '5000000',
+        // Reconnect settings for network drops
+        '-reconnect', '1',
+        '-reconnect_streamed', '1',
+        '-reconnect_delay_max', '5',
+        // Prevent Range/HEAD requests that some providers reject with 405
+        '-seekable', '0',
+        '-i', url,
+        // STRICT MAPPING: Only map video and audio, ignore subtitles/data/attachments
+        // This prevents remux failure when source container has incompatible subtitle tracks (e.g. MKV -> MP4)
+        '-map', '0:v',
+        '-map', '0:a',
+        // Drop subtitles (-sn) and data (-dn) explicitly
+        '-sn', '-dn',
+        // Copy streams without re-encoding
+        '-c', 'copy',
+        // Ensure extradata is correctly extracted/converted (fixes Annex B -> AVCC issues in Firefox)
+        '-bsf:v', 'dump_extra',
+        // NOTE: We intentionally do NOT use -bsf:a aac_adtstoasc here
+        // That filter only works for AAC audio and breaks AC3/EAC3/MP3.
+        // If AAC audio from MPEG-TS fails in MP4, use /api/transcode instead.
+        // Handle timestamp discontinuities at output
+        '-fps_mode', 'passthrough',
+        '-max_muxing_queue_size', '1024',
+        // Fragmented MP4 for streaming (browser-compatible)
+        '-f', 'mp4',
+        '-movflags', 'frag_keyframe+empty_moov+default_base_moof',
+        '-' // Output to stdout
+    ];
+
+    console.log(`[Remux] Full command: ${ffmpegPath} ${args.join(' ')}`);
+
+    let ffmpeg;
+    try {
+        ffmpeg = spawn(ffmpegPath, args);
+    } catch (spawnErr) {
+        console.error('[Remux] Failed to spawn FFmpeg:', spawnErr);
+        return res.status(500).json({ error: 'FFmpeg spawn failed', details: spawnErr.message });
+    }
+
+    // Set headers for fragmented MP4
+    res.setHeader('Content-Type', 'video/mp4');
+    res.setHeader('Access-Control-Allow-Origin', '*');
+
+    // Pipe stdout to response
+    ffmpeg.stdout.pipe(res);
+
+    // Log stderr (useful for debugging)
+    ffmpeg.stderr.on('data', (data) => {
+        const msg = data.toString();
+        // Only log warnings/errors, not progress
+        if (msg.includes('Warning') || msg.includes('Error') || msg.includes('error')) {
+            console.log(`[Remux FFmpeg] ${msg}`);
+        }
+    });
+
+    // Cleanup on client disconnect
+    req.on('close', () => {
+        console.log('[Remux] Client disconnected, killing FFmpeg process');
+        ffmpeg.kill('SIGKILL');
+    });
+
+    // Handle process exit
+    ffmpeg.on('exit', (code) => {
+        if (code !== null && code !== 0 && code !== 255) {
+            console.error(`[Remux] FFmpeg exited with code ${code}`);
+        }
+    });
+
+    // Handle spawn errors
+    ffmpeg.on('error', (err) => {
+        console.error('[Remux] Failed to spawn FFmpeg:', err);
+        if (!res.headersSent) {
+            res.status(500).json({ error: 'Remux failed to start' });
+        }
+    });
+});
+
+module.exports = router;