How To capture video from tv-tuner card via mencoder

I need to test the TV tuner. The result is not achieved. But got the experience to capture video to disk.

$ mencoder -tv driver=v4l2:alsa:amode=1:adevice=hw.0,0:normid=1:input=0:device=/dev/video0:freq=421.125 \ 
tv:// -ovc lavc -oac pcm -o tv.avi



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