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[BUG] Infinite export loop when adding looped background music to a silent video at 1x speed #1284
Description
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Architecture notes
Reframe is a static Next.js app with
output: "export". Key points:- All video processing uses FFmpeg.wasm (client-side, no server)
headers()innext.config.tswon't work — usevercel.jsoninsteadnot-found.tsxrequirespublic/404.html+vercel.jsonroutes config
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/assign
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@magic-peach A fix has been implemented and PR #1289 is open for review.
Hey @shahabhilash, final warning!
⚠️ This issue has had no activity for 4 days and will be automatically unassigned in 24 hours if there is no update.This issue has been unassigned from @shahabhilash due to 5 days of inactivity and is open for anyone to pick up — comment
/assignto claim it!Thanks for this report! This looks like the same underlying bug as #1577 (infinite export loop / OOM when looping background music on a video with no original audio) — #1577 has a bit more detail on the root cause, so I'm closing this one in favor of that one to keep the discussion in one place. Please jump into #1577 if you have anything to add — reproduction steps, environment details, anything helps!
Bug: Infinite export when looping background music on videos without original audio
Description
If a user uploads a video that has no audio track (or mutes the original audio so
hasOriginalAudio === false) and adds a background music track with “Loop Music” enabled, the export process never finishes.The FFmpeg process continues indefinitely, eventually:
Steps to Reproduce
OR mute the original audio so
hasOriginalAudioevaluates tofalseExpected Behavior
The export should stop when the video duration ends and produce a valid output file.
Actual Behavior
The export runs indefinitely because the looped audio stream never terminates.
Root Cause
In
src/lib/ffmpeg.tsinsidebuildArguments:loopMusicis enabled, the background music input is prefixed with: