[FFmpeg-user] Converting Audible AAX

Robert Chalmers robert at chalmers.com.au
Thu Jan 14 09:33:41 CET 2016

They can actually be unencoded if you have the activation key.

ffmpeg -activation_bytes 62689101 -i Volume1.aax -vn -c:a copy -v debug Voume1.mp4

This is now my error message.

[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

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

So either my activation_bytes are wrong …. or something else is amiss.

> On 14 Jan 2016, at 03:58, G A <numinous_one at outlook.com> wrote:
> they are encrypted files, ffmpeg is not going to crack it
> Audible AAX files are encrypted M4B files, and they can be decrypted by
> specifying a 4 byte activation secret.
> --
> View this message in context: http://ffmpeg-users.933282.n4.nabble.com/Converting-Audible-AAX-tp4673787p4674063.html
> Sent from the FFmpeg-users mailing list archive at Nabble.com.
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Robert Chalmers
robert at chalmers.com.au  Quantum Radio: http://tinyurl.com/lwwddov
Mac mini 6.2 - 2012, Intel Core i7,2.3 GHz, Memory:16 GB. El-Capitan 10.11. 2TB Storage made up of - 
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