Bash audio converter using ffmpeg

convert.sh

#!/bin/bash
find "$1" -name *.$2 | while read filename
do
	newdir="$3"/${filename#*/}
	newpath=${newdir%/*}
	mkdir -p "$newpath"
	newext=${newdir%.$2}.$4
	ffmpeg -i "$filename" -vn "$newext" < /dev/null
done