Ripping MPeg to dvd

[Budmiester]

Ok Hello everyone . I am new here to the boards so please excuse any mistakes i may make.
I want to know why when i convert a divx or another movie to dvd, Some of them have a problem with the sound track being on the right position with the mouth movements the sound starts first then the mouth moves a few seconds later. The video is great np's there but the sound track is off. I have a sony dru-510a burner, clone dvd, nero 6.0 with all plug ins, cucusoft converter, my main users i have alot of convertors but those are the main one's i use. Anyone else out here convert regular movie files to dvd and run into the same problem?
Thnx in advance
Budmiester