I have been looking for an easy way to grab the signal from a regular USB webcam and get something from it that is usable on youtube. In the newer versions of ubuntu the /dev/audioN has been dropped from the kernel, so you have to use the audio signal from the ALSA layer instead. Here is how:
mencoder tv:// -tv driver=v4l2:width=320:height=240:device=/dev/video0:forceaudio:alsa:adevice=hw.1:amode=1:channel=3:fps=30:audiorate=32000 -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=1500:keyint=25 -oac mp3lame -lameopts cbr:br=128:mode=3 -fps 30 -o webcam.avi
The output will be in mpeg4.
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