[FFmpeg-user] Converting Audible AAX

Robert Chalmers robert at chalmers.com.au
Mon Jan 11 09:40:38 CET 2016

Carl Eugen Hoyos <cehoyos <at> ag.or.at> writes:

> Paul W <kiwigadgaholic <at> gmail.com> writes:
> > $ ffmpeg -activation_bytes xxxxxxxx -i example.aax
> What does ffmpeg -i example.aax show?
> (The option only works if the aax file is 
> correctly identified.)
> Carl Eugen
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> ffmpeg-user <at> ffmpeg.org
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Sorry to add my question to this, but what actually is 
the -activation_bytes string. Where do I find 

My file is recognised with ffmpeg -i example.ax But, 
trying this command
ffmpeg -activation_bytes 62689101 -i Volume1.aax -vn -c:a copy -v \
 debug output2.mp4

results in this error

Opening an input file: Volume1.aax.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fee2b010600] Format mov,
mp4,m4a,3gp,3g2,mj2 probed with 
size=2048 and score=100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fee2b010600] ISO: File Type Major Brand: aax 
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fee2b010600] [aax] file checksum ==
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fee2b010600] [aax] mismatch in checksums!
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fee2b010600] error reading header


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