Xvid in mp4 file

[ReferenceDivx]

I am able to mux a aac file with a Divx 5 file that doesnt use B frames.

When i try to use the xvid codec i get a mp4 file that plays but looks terrible.

[MaTTeR]

How about a little more details so we don't have to play a guessing game?:) Specifics please. You can start by telling us the muxing procedure and which player you tried.