I'm looking for something that will convert .mp4 to .avi using Xvid decoder.

Handbreak and VLC can't seem to do this.

The settings I would like are:

640x352 (no change from the original video)
bit rate 800-900
maybe something that let's me tweak fps
Xvid
Audio .mp3
frequency 128k
audio bit rate 44100

Any good suggestions?