desktop:~$ ./stream.sh
ffmpeg version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav developers
  built on Mar 30 2013 22:23:21 with gcc 4.7.2
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
[x11grab @ 0x89cc0a0] device: :0.0+0,0 -> display: :0.0 x: 0 y: 0 width: 1024 height: 768
[x11grab @ 0x89cc0a0] shared memory extension  found
[x11grab @ 0x89cc0a0] Estimating duration from bitrate, this may be inaccurate
Input #0, x11grab, from ':0.0+0,0':
  Duration: N/A, start: 1377336545.349438, bitrate: 629145 kb/s
    Stream #0.0: Video: rawvideo, bgra, 1024x768, 629145 kb/s, 25 tbr, 1000k tbn, 25 tbc
[alsa @ 0x89da280] capture with some ALSA plugins, especially dsnoop, may hang.
[alsa @ 0x89da280] Estimating duration from bitrate, this may be inaccurate
Input #1, alsa, from 'pulse':
  Duration: N/A, start: 1377336544.998994, bitrate: N/A
    Stream #1.0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
Unrecognized option 'preset'
Failed to set value 'fast' for option 'preset'