Trevor Mears
122 lines
4.4 KiB
JavaScript
122 lines
4.4 KiB
JavaScript
const express = require('express');
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const router = express.Router();
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const { spawn } = require('child_process');
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const db = require('../db');
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/**
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* Remux stream (container conversion only)
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* GET /api/remux?url=...
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*
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* Remuxes MPEG-TS to fragmented MP4 for browser playback.
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* This is a lightweight operation - no video/audio re-encoding.
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* Use this for raw .ts streams that browsers can't play directly.
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*
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* Note: This does NOT fix Dolby/AC3 audio issues - use /api/transcode for that.
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*/
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router.get('/', async (req, res) => {
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const { url } = req.query;
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if (!url) {
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return res.status(400).json({ error: 'URL parameter is required' });
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}
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const ffmpegPath = req.app.locals.ffmpegPath || 'ffmpeg';
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// Get User-Agent from settings
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const settings = await db.settings.get();
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const userAgent = db.getUserAgent(settings);
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console.log(`[Remux] Starting remux for: ${url}`);
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console.log(`[Remux] Using User-Agent: ${settings.userAgentPreset}`);
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// FFmpeg arguments for pure remux (no encoding)
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// Very lightweight - just changes container from TS to fragmented MP4
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const args = [
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'-hide_banner',
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'-loglevel', 'warning',
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'-user_agent', userAgent,
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// Low-latency startup: reduce probe/analyze time for faster first bytes
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'-probesize', '32768',
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'-analyzeduration', '500000', // 0.5 seconds - enough to detect audio
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// Error resilience: discard corrupt packets, generate timestamps, ignore DTS, no buffering
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'-fflags', '+genpts+discardcorrupt+igndts+nobuffer',
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// Ignore errors in stream and continue
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'-err_detect', 'ignore_err',
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// Limit max demux delay to prevent buffering issues with bad timestamps
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'-max_delay', '5000000',
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// Reconnect settings for network drops
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'-reconnect', '1',
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'-reconnect_streamed', '1',
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'-reconnect_delay_max', '5',
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// Prevent Range/HEAD requests that some providers reject with 405
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'-seekable', '0',
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'-i', url,
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// STRICT MAPPING: Only map video and audio, ignore subtitles/data/attachments
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// This prevents remux failure when source container has incompatible subtitle tracks (e.g. MKV -> MP4)
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'-map', '0:v',
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'-map', '0:a',
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// Drop subtitles (-sn) and data (-dn) explicitly
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'-sn', '-dn',
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// Copy streams without re-encoding
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'-c', 'copy',
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// NOTE: We intentionally do NOT use -bsf:a aac_adtstoasc here
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// That filter only works for AAC audio and breaks AC3/EAC3/MP3.
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// If AAC audio from MPEG-TS fails in MP4, use /api/transcode instead.
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// Handle timestamp discontinuities at output
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'-fps_mode', 'passthrough',
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'-max_muxing_queue_size', '1024',
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// Fragmented MP4 for streaming (browser-compatible)
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'-f', 'mp4',
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'-movflags', 'frag_keyframe+empty_moov+default_base_moof',
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'-' // Output to stdout
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];
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console.log(`[Remux] Full command: ${ffmpegPath} ${args.join(' ')}`);
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let ffmpeg;
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try {
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ffmpeg = spawn(ffmpegPath, args);
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} catch (spawnErr) {
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console.error('[Remux] Failed to spawn FFmpeg:', spawnErr);
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return res.status(500).json({ error: 'FFmpeg spawn failed', details: spawnErr.message });
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}
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// Set headers for fragmented MP4
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res.setHeader('Content-Type', 'video/mp4');
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res.setHeader('Access-Control-Allow-Origin', '*');
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// Pipe stdout to response
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ffmpeg.stdout.pipe(res);
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// Log stderr (useful for debugging)
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ffmpeg.stderr.on('data', (data) => {
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const msg = data.toString();
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// Only log warnings/errors, not progress
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if (msg.includes('Warning') || msg.includes('Error') || msg.includes('error')) {
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console.log(`[Remux FFmpeg] ${msg}`);
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}
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});
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// Cleanup on client disconnect
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req.on('close', () => {
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console.log('[Remux] Client disconnected, killing FFmpeg process');
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ffmpeg.kill('SIGKILL');
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});
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// Handle process exit
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ffmpeg.on('exit', (code) => {
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if (code !== null && code !== 0 && code !== 255) {
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console.error(`[Remux] FFmpeg exited with code ${code}`);
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}
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});
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// Handle spawn errors
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ffmpeg.on('error', (err) => {
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console.error('[Remux] Failed to spawn FFmpeg:', err);
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if (!res.headersSent) {
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res.status(500).json({ error: 'Remux failed to start' });
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}
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});
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});
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module.exports = router;
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