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What can be known about Audible AA, AAX and AAX+ formats?
encoder
post Jan 21 2014, 07:25
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http://www.audible.com/audioformats

The Internets talks about an AAX+ format, too. DRM notwithstanding, are they compatible with any standard or 3rd party player?
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AndyH-ha
post Jan 21 2014, 08:59
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Audible maintains a list, on their web site, of payers that will work with their downloads.
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AndyH-ha
post Jan 21 2014, 09:01
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There is a link to their list at the bottom of the page you mentioned.
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saratoga
post Jan 21 2014, 09:25
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wikipedia says .aa is usually mp3 or a speech codec.
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encoder
post Feb 19 2014, 23:36
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Thanks.
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jensend
post Feb 20 2014, 06:18
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The older .aa formats are apparently either ACELP or MP3, wrapped in Audible's proprietary DRM.

People say the 64kbps Audible Enhanced format is AAC-based; I can't find any reliable source for this but it obviously makes sense given that the format was introduced in 2009, is in a bitrate range where AAC has few competitors, and received device playback support fairly quickly.
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encoder
post Mar 2 2014, 07:27
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http://osherove.com/blog/2008/7/6/introduc...ooks-drm-f.html
Though this hole has obviously been fixed since then.

The main point: the DRM is added when the file is downloaded, on the client side.

So I toyed around downloading a few files then aborting the downloads in the middle, this is what I have found:

Enhanced AAX files: VLC player neatly showed the chapters, so they are highly likely M4B, aka. AAC book files. Just like files from Downpour/Blackstone. They started to play though no sounds was heard. I don't know much about AAC files, this is the way they are supposed to work?

Lower levels: Could not play them at all. Strange.

This post has been edited by encoder: Mar 2 2014, 07:34
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