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fix(web-test): fix amix silence with many adelay inputs (int64 overflow)

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ffmpeg amix + adelay with large delays causes timestamp overflow
(dts near INT64_MAX), producing silent/truncated audio. Fix: use a
silence reference track as first amix input with duration=first,
so amix runs for full video length regardless of delayed stream
timestamps.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Nick Shirokov
2026-03-12 12:21:30 +03:00
parent c6a84e2f91
commit 298589d7cc
1 changed files with 8 additions and 3 deletions
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.claude/skills/web-test/scripts/browser.mjs
+8 -3
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@@ -3331,15 +3331,20 @@ export async function addNarration(videoPath, opts = {}) {
const label = `a${i}`;
mixLabels.push(`[${label}]`);
filterParts.push(`[${i}]${filters.length ? filters.join(',') : 'acopy'}[${label}]`);
// Input indices are shifted by 1 because silence reference is input [0]
filterParts.push(`[${i + 1}]${filters.length ? filters.join(',') : 'acopy'}[${label}]`);
}
// Generate a silence reference track as input [0] so amix runs for full video duration
const silencePath = pathJoin(tempDir, 'silence.mp3');
generateSilence(silencePath, Math.ceil(videoDuration), ffmpegPath);
const filterComplex = filterParts.join(';') + ';' +
mixLabels.join('') + `amix=inputs=${captions.length}:normalize=0`;
`[0]${mixLabels.join('')}amix=inputs=${captions.length + 1}:normalize=0:duration=first`;
const narrationPath = pathJoin(tempDir, 'narration.mp3');
execFileSync(ffmpegPath, [
'-y', ...ffmpegInputs,
'-y', '-i', silencePath, ...ffmpegInputs,
'-filter_complex', filterComplex,
'-t', String(Math.ceil(videoDuration)),
'-c:a', 'libmp3lame', '-b:a', '128k', narrationPath,