Something

apnic07:/usr/helix/ffmpeg# /usr/bin/ffmpeg -i /tmp/x.avi 
FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2007 Fabrice Bellard, et al.
  configuration: --enable-gpl --enable-pp --enable-swscaler --enable-pthreads --enable-libvorbis --enable-libtheora --enable-libogg --enable-liba52 --enable-libdts --enable-libgsm --enable-dc1394 --disable-debug --enable-shared --prefix=/usr
  libavutil version: 1d.49.3.0
  libavcodec version: 1d.51.38.0
  libavformat version: 1d.51.10.0
  built on Jun 23 2007 14:31:53, gcc: 4.1.3 20070601 (prerelease) (Debian 4.1.2-12)
Input #0, avi, from '/tmp/x.avi':
  Duration: 00:43:24.8, start: 0.000000, bitrate: 829 kb/s
  Stream #0.0: Video: mpeg4, yuv420p, 1172x868, 11.00 fps(r)
  Stream #0.1: Audio: mp3, 22050 Hz, mono, 56 kb/s
Must supply at least one output file
apnic07:/usr/helix/ffmpeg# 





apnic07:/usr/helix/ffmpeg# /usr/local/bin/ffmpeg -i /tmp/x.avi 
FFmpeg version SVN-r10822, Copyright (c) 2000-2007 Fabrice Bellard, et al.
  configuration: --enable-gpl --enable-pp --enable-swscaler --enable-pthreads --enable-libvorbis --enable-libtheora --enable-libogg --enable-liba52 --enable-libgsm --disable-debug --enable-shared
  libavutil version: 49.5.0
  libavcodec version: 51.46.0
  libavformat version: 51.16.0
  built on Oct 21 2007 09:42:41, gcc: 4.1.3 20070812 (prerelease) (Debian 4.1.2-15)
Input #0, avi, from '/tmp/x.avi':
  Duration: 00:43:24.8, start: 0.000000, bitrate: 829 kb/s
    Stream #0.0: Vid, 11.00 fps(r)
    Stream #0.1: Aud
Must supply at least one output file
apnic07:/usr/helix/ffmpeg#