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#4818Cut export drifts audio by two frames on long timelines
In progressCriticalSuite · reported by Mara Ilves
Past forty minutes, audio lands two frames late in the exported file.
Workaround. Export in two halves of under forty minutes each and join them in the timeline; neither half drifts.
Steps to reproduce
- Build a 45-minute timeline.
- Export at 24 fps.
- Check sync at the end.
Progress
3 of 5- Reported
Filed as issue #4818 on GitHub.
- Confirmed
Reproduced on any timeline over forty minutes at 24 fps.
- Assigned
Mara. The drift is in the resampler, not the muxer.
- Fix merged
Fix is up for review; waiting on a second pair of eyes.
- Shipped
Planned for 1.4.3.
Fix audio drift on long Cut exports
BugTwo frames late past forty minutes. Critical for anyone editing a feature.
$2,140from 74 people
Reproduced with a 52-minute timeline. Two frames late at the tail, none at the head, so it is drift, not an offset.
Found it. The resampler rounds its buffer size per chunk and the rounding accumulates. Fix is small; the test is the slow part because it needs a long render.
Exporting in two halves works for now. Marked affects me.