oot@lucas:~# ffmpeg -f video4linux -s 320x240 -b 600k -r 25 -i /dev/video0 -f mpeg test.mpeg
FFmpeg version SVN-r19352-4:0.5+svn20090706-2ubuntu1, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  configuration: --extra-version=4:0.5+svn20090706-2ubuntu1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --disable-stripping --disable-vhook --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --extra-cflags=-I/build/buildd/ffmpeg-0.5+svn20090706/debian/include --enable-shared --disable-static
  libavutil     49.15. 0 / 49.15. 0
  libavcodec    52.20. 0 / 52.20. 0
  libavformat   52.31. 0 / 52.31. 0
  libavdevice   52. 1. 0 / 52. 1. 0
  libavfilter    0. 4. 0 /  0. 4. 0
  libswscale     0. 7. 1 /  0. 7. 1
  libpostproc   51. 2. 0 / 51. 2. 0
  built on Aug 26 2009 09:45:50, gcc: 4.4.1
[video4linux @ 0x9217ac0]VIDIOCSWIN: Bad address
/dev/video0: I/O error occurred
Usually that means that input file is truncated and/or corrupted.
root@lucas:~#