halexander9000@halexander9000-904HD:~/ffmpeg$ ffmpeg -f x11grab -s vga -r 16 -i :0.0 /tmp/out.mpg
ffmpeg version N-38318-g34210e8 Copyright (c) 2000-2012 the FFmpeg developers
  built on Feb 29 2012 17:37:23 with gcc 4.6.1
  configuration: --enable-gpl --enable-nonfree --enable-libx264 --enable-libtheora --enable-libvorbis --enable-x11grab
  libavutil      51. 41.100 / 51. 41.100
  libavcodec     54.  4.100 / 54.  4.100
  libavformat    54.  1.100 / 54.  1.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 62.101 /  2. 62.101
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  7.100 /  0.  7.100
  libpostproc    52.  0.100 / 52.  0.100
Unknown input format: 'x11grab'