Rare Audio sync problem

[cyberkash]

I've got some rather unusual thing that happens to me in years of movie conversion. If there are 2 or 3 parts to an Xvid with ac3 audio, the first part will always have an audio sync problem with the video and the other parts will be fine. I've used Vdub to frameserve and convert the audio to wav but its still the same.

I use tmpgenc 2.5 plus to capture and convert to vcd format.
Thoughts are appreciate.

Thanks

[reboot]

Vdub adds a 500ms delay to audio start. Maybe that's it? Click Audio, Interleaving.

[cyberkash]

The audio interleaving is checked but the strange part is the audio is ahead of the video.

[thor300]

Reboot got me confused for a while here. I dont think vdub adds half a second delay, that would be horrible at best, it just set some kind of preloading (file header or internally, i have no idea) to 500ms, not really an interleaving.

[SatStorm]

Adjust it then. Set negative values to virtuldub's interleaving tab

[reboot]

I'm just going by what little info it has in vdub. I also assumed it was a sort of "preloading", and not really a 500ms delay.
If the audio is systematically out of sync (same throughout the whole movie), then vdub can fix that easily.
If it's progressively out of sync, I use Goldwave to fix it easily.
Though this is written for mpeg, it applies just as easily to avi: http://club.cdfreaks.com/showthread.php?s=&threadid=59487