ok but now we need more details:
first: dvd2avi don't convert the audio to ac3 but extract the ac3 if the vob have ac3 track audio!
second: now we are working with what "if you remember correctly" and this could be a problems cos you're not certain but have some doubt about this. then we can use the reference 0(zero)delay but with reserves!
third:what program did you use to convert from ac3 to mp2?
fourth:what parameters did you adjust in the encoder?(bitrate,44k or 48k,etc)
fifth: after you get the mp2, what program was used to mux the audio and video and the adjusts used to do this.
sixth: the loose of the sincro between audio/video happen in the pc(in what player?) or in your standalone dvd player(on tv)?
seventh:don't know if i forgot to ask something !?!?
see my friend oxycotton420, i need all details to search for the solution!
sometimes the solution is simple but all details are importants.