Cut DivX with Sound & Video fade-in (fade-out)

Hello,

maybe it´s a Newbie question but i didn´t find any answer.
I convert a DVD to a DivX of - lets say - 1200 MB. Okay - now i try to split this DivX AVI into to pieces. But i want to cut the movie this way that part one fades out smooth and part two begins with a smooth fade in.
When i convert to MPG i use Premiere and it works fine! To cut DivX in Premiere isn´t a good solution because i can´t use my MP3 codec´s with Premiere (Error when i try to export). Virtual-Dub cuts the movie in a hard-way.

Is there a solution for my problem?

Many regards,

Oliver Boerner