Variable Audio-Video Sync Problem

[raywood]

On a Win10 Pro x64 desktop, I play a video in PotPlayer. Audio and video are out of sync. I import that video into Adobe Premiere Elements 2020. Audio and video continue to be out of sync in PotPlayer - but they are in sync, for the same video, in Premiere Elements. I close Premiere Elements and PotPlayer, and then try again to play that video in PotPlayer. Now audio and video are in sync.

I close PotPlayer and do other stuff for a few hours. I resume playing the video where I left off, in PotPlayer. Audio and video are back out of sync. I start Premiere Elements and play a bit of the video. It's in sync. I start a new session of PotPlayer. As before, the video is in sync there too.

Any idea what's going on?

[ProWo]

Cut 30 sec of this video with avidemux and post it here.

[raywood]

In response to that request for an excerpt, I screen-captured a video segment using OBS Studio. Viewed in PotPlayer, it was out of sync. I cut a 30-second excerpt as requested, using Avidemux and also FFmpeg. In both cases, played in PotPlayer, the audio and video were in sync in the excerpt. I closed the first PotPlayer session (displaying the original) and started a new one (again displaying the original). Now the original was in sync too.

I have uploaded the 30-second excerpt as requested. I doubt there's anything of interest there.

There doesn't appear to be an issue with the video per se. It seems more likely that it would be a driver issue. It appears that tools like Avidemux may load drivers that resolve something missing in PotPlayer.

I think I did encounter the same problem when using other players. I can't test that now, because apparently the required driver is loaded at the moment. I will have to try again later, when the problem recurs in PotPlayer.

[davexnet]

That video is useless since youtube re-encodes everything. Upload an unmodified sample direct from your source to this site.
Avidemux in "copy" mode should be fine

[raywood]

OK. Let's try that again.

[ProWo]

OK. Let's try that again.

Video in synch with both audiostreams.
Maybe your computer is overwhelmed with the 1920x1080 video resolution.

[raywood]

But in that case, why would it be in sync sometimes and not at other times?

Probably not overwhelmed. The CPU is an Intel Core i7-4790. 32GB RAM. It's a capable video editing machine. System Monitor (via Moo0) reports plenty of free resources. Not much else running on the system.

[ProWo]

But in that case, why would it be in sync sometimes and not at other times?

Probably not overwhelmed. The CPU is an Intel Core i7-4790. 32GB RAM. It's a capable video editing machine. System Monitor (via Moo0) reports plenty of free resources. Not much else running on the system.

Maybe a Potplayer issue...
Could be a problem with temporary files too.
https://4ddig.tenorshare.com/windows-recovery-solutions/how-to-delete-temporary-files-...indows-10.html