#!/bin/sh 

if [ $1 ]; then

 # set station
 v4lctl setstation $1
 # set mixers
 amixer sset Aux,0 60%,60% unmute,cap
 amixer sset Capture,0 50%,50% 
 # start mencoder. Apply crop to reduce possible noise/black around the
 # edges
 mencoder -tv driver=v4l:width=640:height=480:adevice=/dev/dsp:forceaudio:forcechan=1 \
	-ovc lavc -lavcopts vcodec=mpeg4:vbitrate=1400:vhq:vqmax=31 \
	-oac mp3lame -lameopts cbr:br=64 \
	-vf crop=624:464:8:12,pp=lb -o $3 \
	-endpos $2 tv://
else
 echo usage: $0 channel duration filename
fi