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Apply AAC remux filters only to matching audio tracks

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Adapted from MikaelKW/nodecast-tv-plus commit 25f7cb636a07a3efb2c409ff182920ae0fbe01bd.

Co-authored-by: Mikael <mikaelkwessel@gmail.com>
This commit is contained in:
Technomancer702
2026-10-12 16:11:34 -07:00
parent e646e36869
commit 788d43a4cb
7 changed files with 174 additions and 11 deletions
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34
test/remux.test.js
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@ -112,6 +112,22 @@ test('remux accepts HTTP(S), preserves query credentials, and restricts nested p
}
});
test('remux filters only AAC output tracks and rejects malformed codec hints', async t => {
const { base, calls } = await routeFixture(t);
const url = `${base}/api/remux?url=http%3A%2F%2Fprovider.test%2Fmedia.ts`;
assert.equal((await request(`${url}&audioCodecs=mp3%2CAAC%2Cunknown%2Caac%2Cac3`)).status, 200);
const args = calls.at(-1).args;
assert.equal(args[args.indexOf('-bsf:a:1') + 1], 'aac_adtstoasc');
assert.equal(args[args.indexOf('-bsf:a:3') + 1], 'aac_adtstoasc');
assert.equal(args.filter(arg => arg.startsWith('-bsf:a')).length, 2);
for (const query of ['audioCodecs=aac&audioCodecs=mp3', 'audioCodecs[x]=aac',
'audioCodecs=aac,,mp3', 'audioCodecs=-i',
`audioCodecs=${Array(17).fill('aac').join(',')}`]) {
assert.equal((await request(`${url}&${query}`)).status, 400, query);
}
assert.equal(calls.length, 1);
});
function findFFmpeg() {
// Match server/index.js: prefer system FFmpeg, then the optional binary.
if (spawnSync('ffmpeg', ['-version'], { stdio: 'ignore' }).status === 0) return 'ffmpeg';
@ -153,11 +169,17 @@ test('real FFmpeg remuxes encrypted HLS over HTTP and blocks local HLS segments'
'-c:v', 'libx264', '-threads', '1', '-preset', 'ultrafast', '-tune', 'zerolatency',
'-c:a', 'libmp3lame', '-f', 'mpegts', sample]);
assert.equal(generated.code, 0, generated.stderr);
const mixedSample = path.join(dir, 'mixed.ts');
const mixedGenerated = await runFFmpeg(ffmpeg, ['-hide_banner', '-loglevel', 'error', '-y',
'-i', sample, '-map', '0:v', '-map', '0:a', '-map', '0:a',
'-c:v', 'copy', '-c:a:0', 'libmp3lame', '-c:a:1', 'aac', '-f', 'mpegts', mixedSample]);
assert.equal(mixedGenerated.code, 0, mixedGenerated.stderr);
const media = fs.readFileSync(sample), key = Buffer.alloc(16, 0x5a), iv = Buffer.alloc(16);
const cipher = crypto.createCipheriv('aes-128-cbc', key, iv);
const header = '#EXTM3U\n#EXT-X-VERSION:3\n#EXT-X-TARGETDURATION:12\n#EXT-X-MEDIA-SEQUENCE:0\n';
const resources = {
'/media.ts': media,
'/mixed.ts': fs.readFileSync(mixedSample),
'/key.bin': key,
'/encrypted.ts': Buffer.concat([cipher.update(media), cipher.final()]),
'/plain.m3u8': Buffer.from(`${header}#EXTINF:12,\nmedia.ts\n#EXT-X-ENDLIST\n`),
@ -174,9 +196,10 @@ test('real FFmpeg remuxes encrypted HLS over HTTP and blocks local HLS segments'
t.after(() => new Promise(resolve => server.close(resolve)));
const base = await listen(server);
const { base: routeBase, calls } = await routeFixture(t);
for (const file of ['media.ts', 'plain.m3u8', 'encrypted.m3u8', 'local.m3u8']) {
for (const file of ['media.ts', 'mixed.ts', 'plain.m3u8', 'encrypted.m3u8', 'local.m3u8']) {
const url = `${base}/${file}`;
assert.equal((await request(`${routeBase}/api/remux?url=${encodeURIComponent(url)}`)).status, 200);
const hints = file === 'mixed.ts' ? '&audioCodecs=mp3,aac' : '';
assert.equal((await request(`${routeBase}/api/remux?url=${encodeURIComponent(url)}${hints}`)).status, 200);
const result = await runFFmpeg(ffmpeg, calls.at(-1).args);
assert.equal(result.timedOut, false, file);
if (file === 'local.m3u8') {
@ -187,6 +210,13 @@ test('real FFmpeg remuxes encrypted HLS over HTTP and blocks local HLS segments'
assert.equal(result.code, 0, `${file} (${ffmpeg}, signal=${result.signal}): ${result.stderr}`);
assert.ok(result.stdout.includes(Buffer.from('ftyp')), `${file}: no MP4 output`);
assert.ok(result.stdout.includes(Buffer.from('mdat')), `${file}: no media packets`);
if (file === 'mixed.ts') {
const output = path.join(dir, 'mixed.mp4');
fs.writeFileSync(output, result.stdout);
const decoded = await runFFmpeg(ffmpeg, ['-hide_banner', '-loglevel', 'error',
'-i', output, '-map', '0:a', '-f', 'null', '-']);
assert.equal(decoded.code, 0, decoded.stderr);
}
}
}
});