如果不打开声音选项就可以录制，打开以后出现could not open/configure sound card错误
#recordMyDesktop stderror output:
Initial recording window is set to:
X:136 Y:72 Width:1704 Height:952
Adjusted recording window is set to:
X:132 Y:68 Width:1712 Height:960
Your window manager appears to be KWin
Detected compositing window manager.
Reverting to full screen capture at every frame.
To disable this check run with --no-wm-check
(though that is not advised, since it will probably produce faulty results).
Initializing...
Buffer size adjusted to 4096 from 4096 frames.
Couldn*t open PCM device hw:0,0
Error while opening/configuring soundcard hw:0,0
Try running with the --no-sound or specify a correct device.