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Problems with interpreting certain AAC/M4B files

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Kassius:
Hi all

I have been using Rockbox on my iPod for audiobook for some time now and it works great with various codecs, including AAC.

I get most of the audiobook from Audible, and Rockbox plays the high resolution 125kbps/44100Hz M4Bs just fine, but with the lower resolutions 62k/22050Hz, the screen starts to freeze and the codec and sample rate shown is wrong. All the are AACs are low complexity, but according to Rockbox the 62k/22050Hz are AAC high efficiency and have a sample rate of 44100 hertz.

I have the same problem with the 32k/22050 though they are playable (due to the lower resolution I assume).

Any suggestions to what might be causing the problem and how to fix it?

For now I convert them to flac (to retain audio quality and because it transcodes faster than opus for instance)

Thank you in advance

saratoga:
The older iPods are too slow to play AAC-HE files. We didn't disable decoding the HE part like Apple does since for a while it looked like it might be possible to decode with more optimization although maybe we should.

If there's an option for regular AAC, just use that.

bahus:

--- Quote from: Kassius on December 17, 2023, 08:42:24 AM ---codec and sample rate shown is wrong

--- End quote ---

Is it reproducible on latest  daily build?

https://gerrit.rockbox.org/r/c/rockbox/+/5335 can either be the fix or the cause of this issue.

Kassius:
Yes, it is the latest daily build and the files are not HE despite what Rockbox thinks.

Kassius:
I tried the stable build that does not include the https://gerrit.rockbox.org/r/c/rockbox/+/5335 as far as I can see, but the issue seemed to be the same.

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