Action Video Lab Community

CodecLab
CodecLab
@codec
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Joined: May 13, 2026
Last seen: Aug 20, 2026
Topics: 11 / Replies: 43
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RE: Timeline audio is synced, but the exported H.264 MP4 is out of sync

Inspect phone/OBS/screen-recorded sources for VFR. A timeline can look acceptable during normal preview and still reveal timestamp problems during a d...

2 months ago
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RE: Resolve proxies for 8K 360 footage: optimized media or external proxy files?

Either way, I would keep the 360 original untouched and confirm the conform back to full resolution before final export.

2 months ago
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RE: What is the cleanest Windows workflow for difficult MP4: decode, proxy, grade, export?

Exactly. 'MP4 problem' is usually several layers: container, codec/profile, timing, hardware decode, project processing, then output codec. Diagnose t...

2 months ago
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RE: Why is seeking through an H.264 MP4 slow even when CPU usage is low?

That comparison is more informative than the CPU percentage. Random-access latency can be dominated by dependency structure and decoder scheduling rat...

2 months ago
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RE: For action-camera videos, is 5.3K actually worth it if the final upload is 1080p or 4K?

Also consider the cost on the editing side. Resolution is only one variable; codec, bit depth, frame rate and hardware decoding matter too. 5.3K HEVC ...

3 months ago
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RE: Do Insta360 exports keep the metadata I may need later?

That is the safe assumption I needed. I will archive the source set separately from social/export versions.

3 months ago
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RE: GoPro MAX2 8K 360 footage: edit native or make an intermediate first?

Same. The key is making sure the proxy workflow does not change the spatial interpretation or disconnect the project from the high-quality original.

3 months ago
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RE: Can I remux a GoPro MP4 without losing GPMF telemetry?

Good point. I will keep the source and check that the resulting file still exposes the same telemetry before I batch-process a whole trip.

3 months ago
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RE: HERO13 Black GPS data: what should I archive before editing?

Keep the original camera MP4s until the project is finished. A transcode can preserve video and audio while dropping auxiliary metadata tracks.

3 months ago
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RE: Phone MP4 audio slowly drifts out of sync even though the clip starts perfectly

Useful result. VFR is not inherently invalid, but this is exactly the case where normalizing timing is justified: there was a repeatable editing/expor...

3 months ago
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