Script to convert audible aax files to DRM-free m4b files via ffmpeg

convert_audible_aax_to_m4b.sh

#!/usr/bin/bash

## extract once using https://github.com/inAudible-NG/audible-activator
activationBytes=""
for m in *.aax; do
  basename=${m%.aax}
  # extract audio stream
  ffmpeg -activation_bytes $activationBytes -i ${basename}.aax -vn -c:a copy ${basename}.m4a
  # extract thumbnail
  ffmpeg -activation_bytes $activationBytes -i ${basename}.aax -an -vcodec copy ${basename}.jpg
  mv ${basename}.m4a ${basename}.m4b
  mp4art --add ${basename}.jpg ${basename}.m4b
  mp4file --optimize ${basename}.m4b
done