Followed Guide but still audio not in sync

[Vidbandit]

I can only post in the newbie section hopefully it's not the wrong section. I followed this
Guide to the tee. I used all the tools, the original .avi was in two files with .ac3. So I combined the files (virtualdubmod) demuxed the sound, fixed the sound (ac3fix) encoded the avi to mpeg 2 (CCE/AVIsynth), and tried to author a dvd (TMPGenc). The sound is off by at least 10 seconds....... Does anyone know what might have happened, or what I can do now to fix it?? I want to move away from the all in one converters, but I am getting a little lost with the long way. But I will say other than the sound issue I have, the quality does seem to look better than the Nero I have been using. Please someone point me in the right direction, or to another guide that will help me get the sound in sync. Thanks.............

[Steve Walsh]

Presumably the sound was in sync in the original avi ?
Was the demuxed audio the same length as the video ? (use something like avicodec/Gspot to look at file properties)
Why did you need to "fix" the audio ?

[mats.hogberg]

Don't join the AVIs before encoding - encode each separately.
Then "join" them implicitly, by adding them to the same track in TDA. If you remove the chapter point TDA inserts at the join, it will play back seamlessly.

/Mats