ffmpeg скринкастинг со звуком



Запускаю командой

ffmpeg -f alsa -ac 2 -i hw:0,0 -acodec pcm_s16le -f x11grab -s 1280x800 -r 25 -i :0.0 -vcodec qtrle

Получаю выхлоп

ffmpeg version 0.8.3-4:0.8.3-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers
  built on Jun 12 2012 16:52:09 with gcc 4.6.3
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
[alsa @ 0x18987a0] Estimating duration from bitrate, this may be inaccurate
Input #0, alsa, from 'hw:0,0':
  Duration: N/A, start: 5511.948419, bitrate: N/A
    Stream #0.0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
[x11grab @ 0x18abc40] device: :0.0 -> display: :0.0 x: 0 y: 0 width: 1280 height: 800
[x11grab @ 0x18abc40] shared memory extension  found
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  142 (MIT-SHM)
  Minor opcode of failed request:  4 (X_ShmGetImage)
  Serial number of failed request:  11
  Current serial number in output stream:  11

Не знаю как чинить.

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