#!/bin/sh
help(){
    echo "Usage: $0 <filename.[mpg]>"
    exit 0
}
if test "$#" != "1"
then
    help
    exit
fi
case $1 in
*.mpg)
    input="$1"
    base=`echo $input | sed "s/\.mpg$//"` ;;
*)
    help ;;
esac

mencoder $input \
	-ovc lavc -lavcopts vcodec=mjpeg:aspect=16/9 -oac pcm -o $base.avi