[FFmpeg-user] Converting Audible AAX

Robert Chalmers robert at chalmers.com.au
Thu Jan 14 17:29:02 CET 2016

Thanks. I solved the problem. There is a script for grabbing the activation code from the registered audible account. That is, you have to have an Audible login account, and books in your library.

The original has a small error, so I forked it from Github, and applied the patch. Well, the patch is already there, but not synched…. and I can see no way of contacting the author?
So I forked my own copy.


This is not my code - and it’s simple Python code, and easy to run from the command line. 

and then 	1.	
ffmpeg -activation_bytes xxxxxxxx -i Volume1.aax -vn -c:a copy -v debug Voume1.mp4 
will work.

> On 14 Jan 2016, at 09:22, Moritz Barsnick <barsnick at gmx.net> wrote:
> On Thu, Jan 14, 2016 at 08:33:41 +0000, Robert Chalmers wrote:
>> [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f9684000000] [aax] file checksum == d72f1f04e3c73d0bc68e742db1bc69b58dc3a500
>> [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f9684000000] [aax] mismatch in checksums!
>> [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f9684000000] error reading header
>> [AVIOContext @ 0x7f9683700420] Statistics: 32768 bytes read, 0 seeks
>> Volume1.aax: Invalid data found when processing input
> That's certainly the message when the activation key is incorrect. You
> can provoke it on the sample by varying the initially correct key.
>> However, this one works ….. Taken from the github site….
>> ffmpeg -activation_bytes 62689101 -i Audible_AAX_sample_62689101.aax -vn -c:a copy -v debug output_sample.mp4
> Now, is this a copy/paste error, or does your activation key really
> happen to be the same as for the github sample? Note your command line:
>> ffmpeg -activation_bytes 62689101 -i Volume1.aax -vn -c:a copy -v debug Voume1.mp4
> Just wondering,
> Moritz
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Robert Chalmers
robert at chalmers.com <mailto:robert at chalmers.com>.au  Quantum Radio: http://tinyurl.com/lwwddov
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