[FFmpeg-trac] #7615(undetermined:new): Support converting *TO* AAX (Audible's proprietary format)

[FFmpeg]

#7615: Support converting *TO* AAX (Audible's proprietary format)
-------------------------------------+-------------------------------------
             Reporter:  C0rn3j       |                     Type:
               Status:  new          |  enhancement
            Component:               |                 Priority:  normal
  undetermined                       |                  Version:
             Keywords:  audible aax  |  unspecified
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------
 Support was added at some point to convert from AAX to other formats. This
 works great.

 https://ffmpeg.org/ffmpeg-all.html#Audible-AAX

 However, ffmpeg does not appear to support converting TO this format.

 Why is this needed? Some devices do not ship with a music player, and the
 only way to play audio is through Audible's app, which in turn does not
 seem to recognize any audio files besides their own proprietary ones.
 Example of this device would be Kindle Paperwhite 4 (10th gen), which
 let's you play audio through Bluetooth, but only through Audible.

 Converting FROM AAX works great -
 {{{
 %  ffmpeg -activation_bytes aabbccdd -i Anomaly_B074TZ7Q5Q.aax -vn -c:a
 copy output.mp4
 ffmpeg version n4.1 Copyright (c) 2000-2018 the FFmpeg developers
   built with gcc 8.2.1 (GCC) 20180831
 }}}

 Converting TO AAX however -
 {{{
 %  ffmpeg -activation_bytes aabbccdd -i output.mp4 -vn -c:a copy
 output.aax
 ...
 [NULL @ 0x562448a9bac0] Unable to find a suitable output format for
 'output.aax'
 output.aax: Invalid argument
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7615>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker