(Yet another Q about) Audio out of sync

[JackPollack]

A while ago I ripped a VOB chapter from a DVD to a AVI-DIVX file (Don't
remember the software that I used).

There are several segments of the file that I want to keep and want to
discard the rest. I have tried DIVX Author and VirtualDub (and now VD Mod) but am having
problems with all.

DIVX Author is creating a file where the video playback will freeze on a
particular frame while the audio plays and then continue. VD is creating
files with the audio out of sync.

I have read the Sticky "Conversion out of sync" but have the same problem with the new file created by VD Mod.

Googeling it and looking through this forum, I see that this is a fairly common problem and have spent several days trying suggestions and creating many files. I'm at the end of my
rope as far as things to try.

I have tried direct stream copy (both A & V)
Full Process (A & V)
Changed the frame rate so both A & V are equal.
Using a separate (external) WAV file as the audio source.

If I chop the file and save it without any compression everything is fine. If I then recompress the new file the audio is out of sync again.

I tried the audio interleave and can get the first part of the audio in sync, but it drops out of sync after a few seconds.

Any help using DIVX Author or VD or a suggestion of a program that will do
this more easily would be greatly appreciated.

Thanks

[redwudz]

It sounds like you have a corrupted file with missing frames or audio. That will cause what you describe. One thing you can try with VD Mod is to to click 'Open video file' then on the selector page, click 'Ask for extended option after this dialog'. In the 'Import options', select 'Re-derive keyframe flags'. That sometimes will clean up a AVI that has a messed up index. And it may help.

Under 'Video' after you open the AVI, you can also 'Scan video stream for errors'. But if the file is really messed up, it may be difficult to do much with it. If you can find the corrupted frames, you can cut them out.

I've also had luck at times by just re-saving the file with 'Direct stream copy', audio and video, then putting that version back in VDM an working with it instead of the original.