Please don't get me wrong, but i believe this has nothing to do with xvid. I have made lots of convertions from xvid-dvd, and almost all went well. I had some problems too, but were always in the audio part, like you are having. But xvid ins't the one to blame here. For what i could see, you are doing everything right (extracting the audio to WAV and then converting it to AC3.) Maybe is the way you are converting the WAV to AC3. Did you follow the guide for that? Or maybe the authoring software you are using that is creating the problems. I always use Maestro, and it gave me no problems. The audio dificulties i had were because in some movies i had "not regular format" audio sources. But we are both risking a strike from the MOD's, because this thread probably belongs in the dvd section, or audio section.