AAXtoMP3 AAxtoM4B

The purpose of this software is to convert AAX files to common MP3, M4A and M4B formats through a basic bash script frontend to FFMPEG.

Audible uses this file format to maintain DRM restrictions on their audio books and if you download your book through your library it will be stored in this format.

The purpose of this software is not to circumvent the DRM restrictions for audio books that you do not own in that you do not have them on your personal Audible account. The purpose of this software is to create a method for you to download and store your books just in case Audible fails for some reason.

Setup

You will need your authentication code that comes from Audible's servers. This will be used by ffmpeg to perform the initial audio convert. You can obtain this string from a tool like audible-activator.

Requirements

• bash 4.3.42 or later tested
• ffmpeg version 2.8.3 or later
• libmp3lame (came from lame package on Arch, not sure where else this is stored)

OSX

Thanks to thibaudcolas, this script has been tested on OSX 10.11.6 El Capitan. YMMV, but it should work for conversions in OSX. It is recommended that you install GNU grep using 'brew install grep' for chapter padding to work.

AUR

Thanks to kbabioch, this script has also been packaged in the AUR. Note that you will still need to extract your activation bytes before use.

Usage(s)

bash AAXtoMP3 [-f|--flac] [-o|--opus] [-a|-aac] [-s|--single] [-A|--authcode <AUTHCODE>] [-o|--output_dir <PATH>] <AAX INPUT_FILES>...
bash AAXtoM4B [AUTHCODE] <AAX INPUT_FILES>...

• [AUTHCODE] your Audible auth code (it won't correctly decode otherwise) (required), See below for more information on setting the AUTHCODE.
• ... are considered input file(s), useful for batching!

MP3 Encoding

• This is the default encoding
• Produces 1 or more mp3 files for the AAX title. If you desire a single file use the --single option
• If you want a mp3 file per chapter do not use the -single option. Note a m3u playlist file will also be created in this instance.

Ogg/Opus Encoding

• Can be done by using the -o or --opus command line switches
• Is designed to efficiently code speech and general audio in a single format
• Opus coded files are stored in the ogg container format for better compatibilitt.

AAC Encoding

• Can be done by using the -a or --aac command line switches
• Designed to be the successor of the MP3 format
• Generally achieves better sound quality than MP3 at the same bit rate.
• This will only produce 1 audio file as output.

FLAC Encoding

• Can be done by using the -f or --flac command line switches
• FLAC is an open format with royalty-free licensing

M4B Encoding

Defaults

• Specifying the AUTHCODE. In order of precidence.
  1. --authcode [AUTHCODE] The command line option. With the highest precidence.
  2. .authcode If this file is placed in the current working directory and contains only the authcode it is used if the above is not.
  3. ~/.authcode a global config file for all the tools. And is used as the default if none of the above are specified. Note: At least one of the above must be specified. The code must also match the encoding for the user that owns the AAX file(s).

Anti-Piracy Notice

Note that this project does NOT ‘crack’ the DRM. It simply allows the user to use their own encryption key (fetched from Audible servers) to decrypt the audiobook in the same manner that the official audiobook playing software does.

Please only use this application for gaining full access to your own audiobooks for archiving/conversion/convenience. DeDRMed audiobooks should not be uploaded to open servers, torrents, or other methods of mass distribution. No help will be given to people doing such things. Authors, retailers, and publishers all need to make a living, so that they can continue to produce audiobooks for us to hear, and enjoy. Don’t be a parasite.

This blurb is borrowed from the https://apprenticealf.wordpress.com/ page.

License

Changed the license to the WTFPL, do whatever you like with this script. Ultimately it's just a front-end for ffmpeg after all.

Need Help?

I'll help out if you are having issues, just submit and issue and I'll get back to you when I can.