Capture screen with mencoder

Hi all.

I capture webcam with:

 $ mencoder tv:// -tv driver=v4l2:width=640:height=480:device=/dev/video0:forceaudio:alsa:adevice=hw.1,0 -ovc lavc -oac mp3lame -lameopts cbr:br=64:mode=3 -o webcam.avi

and it works fine.  How can I modify the above command so to capture desktop
screen with audio?

Thanks for any help,

Rodolfo
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