Tnmpg Audio not in sync please help

[soccer09_9]

hi i have tried this with about 5 different movies and i tried to look for this in the forum and on this webpage but can't find it i have used virtual dub and have not used virtual dub and when i use virtual dub for the conversion in tnmpg it will be fine at the start and in sync then later onin the movie it is out about 3 seconds or so so what is up with that, please help it works fine with not using virtual dub but some movies it won't reconige that i have audio so i have to use virtual dub and i am using avi files if that helps any

[Budgie]

I have exactly the same problem using TMPGEnc the audio starts in sync and by the end of the cd it is a few seconds out. i dont use anything else other than TMPGEnc though - could this be a cause?