Losing audio with Virtual Dub capture

[pumpernickel]

This is driving me crazy and I've done several searches in this forum but nothing seems to really address the problem I'm having...

I am doing captures of VHS using Virtual Dub & huffyuv. I have been primarily doing music videos which have been coming out fantastic - both sound and video are great. These videos average around 3 minutes in length. I recently started capturing video of old Ren & Stimpy episodes which are about 15 minutes long. The video captures great, but about (on average) 1-2 minutes into the capture, I lose all audio. Audio plays and sounds fine for the first minute or so and then silence....
Again, audio works fine with shorter .avi's, but for some reason when I try to capture longer video I completely lose sound. I cannot discern any pattern except that it happens within the first 1-2 minutes of playback. I typically monitor the captures as I do them and I am hearing sound all the way throughout.

I am starting to think this might be a VDub problem? I have no IRQ problems, no virus software or screensavers, a direct line from my hifi VCR into a soundblaster card.

Any help would be greatly appreciated!

[FiEND]

what are you using for audio compression?

the only time I ever had something like this happen was when I somehow got set to uncompressed audio capture which had a max file size which was reached quite quickly.

check virtualdub audio settings and switch it to PCM CD Quality if it isn't.

[normano]

Try Using Nandub its like VirtualDub but it fixed my audio sync problems might help you.

[pumpernickel]

Thanks for the replies.

Yes, I am capturing audio using PCM Cd quality compression.

I have tried several experiments since then and had some different results:
Yesterday I captured the same VHS clip and had sound throughout the AVI. I converted using TMPEG and then lost sound again after 1-2 min. So I dumped the avi file into Sound forge thinking I could just extract the wav and reencode. Well, the wav which came out was only 1.33 minutes long! I reopened the file in VDub, chose save as wav and that grabbed the entire sound bite.

Should I just be extracting and encoding the audio portion seperately all the time?

[danofborg]

This is just a theory but maybe you need to turn up the compression some on the video to free up some cpu cycles for the audio. I'm new to this myself but when i run virtual dub sometimes it just stops during the capture if i'm not compressing much. Granted the quality goes down but at least it completes.

Dan.