#!/bin/sh
if [ "$1" = "" ]; then
	echo >&2 "Usage: justaudio INPUT [OUTPUT]"
	exit 1
fi
dest="$2"
if [ "$dest" = "" ]; then
	dest="$1.mp2"
	dest="${dest/mpg.mp2/mp2}"
fi
if [ -e "$dest" ]; then
	echo >&2 "$dest already exists"
	exit 1
fi
ffmpeg -i "$1" -acodec copy -vn -f mp2 "$dest"