VOB to DivX audio sync problems.

[Heisenberg Uncertainty]

I have recently been trying to convert a VOB file to DivX, however, I have run into a big problem. The audio is out of sync in the final product. I have tried adjusting the framerate as well as the audio bitrate, however, the audio will not stay in sync with the video. Eventually, the video just gets ahead of the audio, or vice versa. I'm not exactly sure what to do, so if anyone has experienced a similar problem, or has a solution, please, let me know! Thanks.

[L3mur]

This happens to me if I use B-Frames. The number of frames and the
length of the audio track are different, so they have to be out of sync.
Without B-Frames everything works fine.