Audio problem

I know this question has been posted in another forum, but I just realized that this forum is more appropiate to my problem. Alright, what I'm trying to do is convert 17 episodes in avi format with tmpeg into mpeg-1. From there I use dvd-lab to burn them onto one dvd+r. Now I've done this with another program (forget which one) but with some of the episodes the audio and video were out of sinc. In any event after I use dvd lab to create the dvd I burn it with nero, the only problem is that the audio in some of the episodes gets kind of staticy whenever it gets too loud. Anybody have any suggestions?