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Add Metadata for Audiobooks?

Suggestions and feature requests, whislists, etc.

Add Metadata for Audiobooks?

Postby vance003 » Mon Aug 31, 2015 2:54 pm

I use FFmpeg to help transfer my aax Audible audiobooks to m4b formats for iTunes. In general it handles the metadata just fine, but I find that Audible uses some tags that FFmpeg does not know about. These include tags for Narrator ("©nrt"), Publisher ("©pub"), and Description ("©des"). The first two are standard tags, comprising up to 255 characters, but the "©des" tag differs from the standard "desc" Description tag in that it has no limit in length; in that way it is more like the LongDescription ("ldes", referred to by FFmpeg as "Synopsis") tag.

In any case, is it possible to incorporate "©nrt", "©pub", and "©des" into a future iteration of FFmpeg? If a length limit has to be attached to "©des", it should be something like 3000 characters --- I've seen some of these that go on and on.

(Alternatively, if in my stupidity I've overlooked a way to get FFmpeg to handle these already, with no recoding needed, please let me know.)

Thanks all!
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Re: Add Metadata for Audiobooks?

Postby rachalmers » Sun Jan 10, 2016 2:51 pm

Saw your posting, and wondered if you would care to share your command line to convert the AAX files please.

I can't figure out what the -activation_byte secret is supposed to be ...

This works fine for aa files.
ffmpeg -i Volume2_1.aa -vsync 2 -c:a copy Volume2_1.mp4

But not for AAX files. What is needed for the

ffmpeg -activation_bytes 1CEB00DA -i test.aax -vn -c:a copy output.mp4

if you can help
robert@chalmers.com.au & Quantum Radio: http://tinyurl.com/lwwddov
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Drive 0:HGST HTS721010A9E630. Upper bay. Drive 1:ST1000LM024 HN-M101MBB. Lower Bay
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