elias@rubbercheese:~/test$ ffmpeg -i MVI_1447.AVI -vcodec mpeg4 -flags +aic+mv4+trell -cmp 2 -subcmp 2 -mbd 2 outfile.mp4
FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2004 Fabrice Bellard
  configuration:  --enable-gpl --enable-pp --enable-pthreads --enable-vorbis --enable-libogg --enable-a52 --enable-dts --enable-libgsm --enable-dc1394 --disable-debug --enable-shared --prefix=/usr
  libavutil version: 0d.49.0.0
  libavcodec version: 0d.51.11.0
  libavformat version: 0d.50.5.0
  built on Sep 20 2006 00:26:15, gcc: 4.1.2 20060906 (prerelease) (Ubuntu 4.1.1-13ubuntu2)
Input #0, avi, from 'MVI_1447.AVI':
  Duration: 00:00:12.4, start: 0.000000, bitrate: 6832 kb/s
  Stream #0.0: Video: mjpeg, yuvj422p, 640x480, 15.00 fps(r)
  Stream #0.1: Audio: pcm_u8, 11024 Hz, mono, 88 kb/s
Output #0, mp4, to 'outfile.mp4':
  Stream #0.0: Video: mpeg4 (hq), yuv420p, 640x480, q=2-31, 200 kb/s, 15.00 fps(c)
  Stream #0.1: Audio: 0x0000, 11024 Hz, mono, 64 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
[mpeg4 @ 0xb7dffba8]removing common factors from framerate
[mpeg4 @ 0xb7dffba8]timebase not supported by mpeg 4 standard
Error while opening codec for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height