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fix(render): preserve normalized M4A edit timing

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This commit is contained in:
Miguel Ángel
2026-07-25 21:14:17 +00:00
parent 113a4985b5
commit 59c56d3257
2 changed files with 30 additions and 1 deletions
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packages/engine/src/services/chunkEncoder.ts
+6 -1
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@@ -690,9 +690,14 @@ export async function muxVideoWithAudio(
args.push("-c:a", "aac", "-b:a", "192k", "-movflags", "+faststart");
}
}
const copiesContainerizedAac =
!isWebm && shouldCopyAudio && extname(audioPath).toLowerCase() === ".m4a";
// PTS bases can diverge during mux and reintroduce negative DTS. See
// buildEncoderArgs for the full reasoning on why that breaks playback.
args.push("-avoid_negative_ts", "make_zero");
// A freshly encoded M4A is the exception: its edit list already hides the
// AAC priming packet. `make_zero` discards that edit and shifts copied video
// forward by one AAC frame (~21ms), creating a visible first-frame offset.
if (!copiesContainerizedAac) args.push("-avoid_negative_ts", "make_zero");
if (fps !== undefined) {
// Set the exact output framerate so the muxer doesn't PTS-average a
// fractional rational like `360000/12001` instead of `30/1` into the