I need some help. Whenever I try converting my MPEG-1 capture (which is at 640 X 480 (30 FPS) (2000 bitrate) to DivX AVI format, the resulting AVI file's audio goes waaaaay off sync at the begining and throughout the video it gets worse.

The thing is that I know I don't have any dropped frames because the MPEG 1 file plays with the Audio perfectly synced throughout the entire video (which is 30 minutes long). I am using VirtualDub to do the conversion. Please help me. Let me know what it is that I am doing wrong.