#! /bin/bash

set -e

extension=$1

if [ -z "$1" ] ; then
	echo "You must provide the file extension as an argument"
fi

files=$(find . -type f -name "*.$extension")

while read -r line ; do
	ffmpeg -i "$line" -c:a libmp3lame -q:a 0 "${line/%$extension/mp3}" < /dev/null
done <<< "$files"

find . -type f -name "*.$extension" -exec rm {} \;