Action Video Lab Community

Alex R.
Alex R.
@alexcut
Active Member
Joined: May 8, 2026
Last seen: Aug 20, 2026
Topics: 4 / Replies: 7
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RE: What H.264 bitrate makes sense for 4K MP4 without creating monster files?

I need H.264 for client-device compatibility, but I can still tune bitrate instead of automatically choosing the largest preset.

1 month ago
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RE: 4K MP4: proxies or full transcode before editing?

I prefer that route if relinking is automatic. I will test one clip from import through final render, then scale the proxy job only if the conform is ...

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

Would you put VFR detection before hardware-decode testing? My worst phone files are both HEVC and VFR, so there are two separate problems hiding in t...

3 months ago
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RE: MP4 plays smoothly in VLC but stutters badly on the editing timeline — why?

I checked it. The clip is HEVC Main10, and this laptop is decoding it on the CPU. A low-res proxy is smooth immediately. So the file was fine; my assu...

4 months ago
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RE: What does 'Variable Frame Rate Detected' actually mean for an MP4 edit?

Watch for symptoms: gradual audio drift, repeated/skipped frames, proxy mismatch, multicam alignment errors or output duration changes. If none appear...

4 months ago
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RE: MP4 plays smoothly in VLC but stutters badly on the editing timeline — why?

That clears up my main misconception: I was treating MP4 as the codec. I will inspect the stream and test hardware decode/proxies before making any ne...

4 months ago
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RE: 60 fps MP4 slow motion looks choppy after a 30 fps export

If optical flow is enabled, disable it and test simple sampling. You do not need synthesized frames when the source already has enough unique frames f...

5 months ago