[alsa @ 0x12c79e0] Estimating duration from bitrate, this may be inaccurate
Input #0, alsa, from 'pulse':
  Duration: N/A, start: 1324009657.545521, bitrate: N/A
    Stream #0:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
[x11grab @ 0x7f0a6c006c40] device: :0.0+471,185 -> display: :0.0 x: 471 y: 185 width: 742 height: 530
[x11grab @ 0x7f0a6c006c40] shared memory extension found
[x11grab @ 0x7f0a6c006c40] Estimating duration from bitrate, this may be inaccurate
Input #1, x11grab, from ':0.0+471,185':
  Duration: N/A, start: 1324009659.621753, bitrate: 188764 kb/s
    Stream #1:0: Video: rawvideo (BGRA / 0x41524742), bgra, 742x530, 188764 kb/s, 15 tbr, 1000k tbn, 15 tbc
[NULL @ 0x7f0a6c013a60] Unable to find a suitable output format for ' '
 : Invalid argument
bash: -acodec: command not found