ubuntu@arm:~/ffmpeg$ ./ffmpeg -f video4linux2 -vcodec h264 -s 640x480 -r 15 -i /
dev/video0   -vcodec copy -an http://localhost:8099/feed1.ffm
ffmpeg version 1.0.git Copyright (c) 2000-2012 the FFmpeg developers
  built on Dec  6 2012 02:15:48 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  configuration: --enable-libx264 --enable-gpl --prefix='~/ff'
  libavutil      52. 11.101 / 52. 11.101
  libavcodec     54. 79.100 / 54. 79.100
  libavformat    54. 44.100 / 54. 44.100
  libavdevice    54.  3.102 / 54.  3.102
  libavfilter     3. 24.100 /  3. 24.100
  libswscale      2.  1.103 /  2.  1.103
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[video4linux2,v4l2 @ 0xc0b650] Cannot find a proper format for codec_id 28, pix_fmt -1.
/dev/video0: Input/output error