Frustrated! Help with audio sync please!

[chromeman]

Hi there,
I am having trouble with audio falling out of sync after I convert an avi file to an SVCD MPEG-2. Its happenned with the last 2 videos I have convereted but never before.
Firstly, when I open them in VirtualDub it says about re-writing the header of the audio. From reading through the forums i read that with VirtualDubMod you can say 'no' to virtualdub re-writing the header so I click no and extract the WAV as I would normally. I then use TMPGEnc to convert the avi and wav file into one SVCD MPEG-2 file. But when I watch the converted file the audio is out of sync even though I said no to re-writing the header (the original avi file is all in sync).
So then I used tmpgenc to try and correct the audio sync using http://www.gromkov.com/faq/faq2004-0064.html but it turns out the audio goes out of sync more as the film goes on! How can I stop it from going out of sync in the first place?!
Please help!
Thanks!

[mats.hogberg]

I'd extract the wav with Goldwave - just load the AVI, Save WAV.
Also, make sure that:
There are no bad frames in the AVI.
You encode to the same frame rate as the source.

/Mats

[chromeman]

Thanks mats. I'll give goldwave a try. By framerate I guess you mean 25fps for PAL, 23.976 for NTSC Film etc?

[mats.hogberg]

By framerate I guess you mean 25fps for PAL, 23.976 for NTSC Film etc?

Yes, but what framerate it is, is irrelevant - just that you stick to the same framerate thruout the process. If the source framerate isn't suitable for your target format, you're in for some heavy duty framerate conversion, and that's a topic of its own...

/Mats