[FFmpeg-user] Cant get past error with AAX file conversion. [aax] mismatch in checksums!

[Robert Chalmers]

ffmpeg -activation_bytes 28617564 -i SherlockHolmesUnabridged.aax -c:a copy Sherlock.mp4

returns 

[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fa124801000] [aax] file checksum == d72f1f04e3c73d0bc68e742db1bc69b58dc3a500
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fa124801000] [aax] mismatch in checksums!
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fa124801000] error reading header
SherlockHolmesUnabridged.aax: Invalid data found when processing input



If I leave out the activation_data key, it creates the file - but there is no sound output. Although the size is correct.



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 - 
Drive 0:HGST HTS721010A9E630. Upper bay. Drive 1:ST1000LM024 HN-M101MBB. Lower Bay