Audio/video sync drift on VHS tape capture

Forum|Forum|3 years ago
April 19, 2022
2 replies
3210 views

I've got some old VHS tapes that were captured to mov. Played back in VLC, they're perfect.

Bringing them into Premiere, however, the sync drifts. By the end of the 90 minute tape, it's around 5-6 seconds out of sync (with the video being faster).

The tapes are in 29.97 frames, 44.1khz audio. I have tried using "interpret footage" to adjust the frame rate slightly, but nothing seems to work, or even get it closer to correct. I do not believe this is a variable frame rate issue, but it is having the same effect as when I get long clips from someone's iphone that does shoot with a variable frame rate.

I have been un-linking the audio and video and then slowing down the video by the difference to line stuff up, but I have to do this for several hundred clips and any advice would really save me a lot of time.

Windows 10, Premiere v 22.2.0

This topic has been closed for replies.

chrisw44157881

Inspiring

did you try prores? MOV is a container. what codecs did you try?

G

GwarAuthor

Known Participant

Yes, the first suggestion was just to try rewrapping it, so that's what I did there. I also converted it to h.264 MP4, which also plays back fine in VLC but not in Premiere. I'm working on Windows so prores is not a good option for me.

chrisw44157881

Inspiring

I tried converting to Cineform and DNXHD and it baked the errors in so that not even VLC had the sync correct. Also the files were 90x larger than the originals, so I'm kind of glad this was not a good solution.

sounds like your fourcc decoder got hijacked if you can't even export shutter into an intraframe codec! vlc must be using a separate fourcc decoder when playing back. you'd got some sleuthing to do. try looking at the .dll to fourcc relationships and meta-info. As a last resort, VLC has a built-in convert-save-as. you might be able to export something out from there.

G

GwarAuthor

Known Participant

For clarification, I did not capture these tapes, it was done by some professional place several years ago. I see a lot of stuff about the tape source natively being 12 bit audio, but the files I have report themselves as being in 44.1 and play back fine in VLC.

A

Andy 1968

Inspiring

The video files from the cheap USB capture devices usually don't play well in Adobe Premiere Pro.

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