ffmpeg version git-2013-02-22-db05f7a Copyright (c) 2000-2013 the FFmpeg developers
  built on Feb 22 2013 12:54:49 with gcc 4.7.2 (GCC)
  configuration: --prefix=/usr --enable-gpl --enable-libass --enable-libfaac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  libavutil      52. 17.102 / 52. 17.102
  libavcodec     54. 92.100 / 54. 92.100
  libavformat    54. 63.100 / 54. 63.100
  libavdevice    54.  3.103 / 54.  3.103
  libavfilter     3. 39.100 /  3. 39.100
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
Missing argument for option 's'.
Error splitting the argument list: Invalid argument
bash: 1280x720: command not found
bash: rtmp://live.justin.tv/app/-REAM_KEY: No such file or directory