mencoder tv://<channel> -tv driver=v4l2:device=/dev/video1:input=0:norm=NTSC:chanlist=us-cable:width=720:height=480:audiorate=48000:alsa:amode=0:adevice=hw.0 -aspect 4:3  -of avi -oac lavc -lavcopts acodec=ac3:abitrate=128 -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=1800  -ofps 30000/1001 -o <videoname.avi>` -endpos <timeduration>