Convert QT to MPEG4 (using ffmpegX 0.0.8c)

[Bobbin]

I'm trying to convert a little video in QT (.mov) format to MPEG4 (.avi) format.
All goes OK except one thing: the sound doesn't work. If I use MP3 format the video goes OK but without a sound track. If I use other sound format de video doesn't work.

I'm using ffmpegX 0.0.8c to do this.
Thanks.

[major]

Please email me the process output at major4@mac.com.