automated audiobook DRM stripping

convert.sh

#!/bin/bash
# ./convert -a asdfghjk
# Obtain an activation_bytes string and plug it into this script with -a.

FILES=aax/*
OUTPUT=mp3

while getopts a: option
do
case "${option}"
in
a) ACTIVATION=${OPTARG};;
esac
done

for f in $FILES
do
  echo "Processing Audiobook $f ..."
  fileshort=$( echo "$f" | cut -c 5- )
  ffmpeg -y -activation_bytes $ACTIVATION -i $f -ab 320k $OUTPUT/${fileshort%????}.mp3
  echo "Processing of Audiobook $f complete..."
  echo "#########"
done