Rockbox Ports are now being developed for various digital audio players!
but i did not realize that AAC was that CPU intensive at any bit rates. i am surprised that needs more CPU than Opus does being AAC is older. like with Opus i can tell it's using quite a bit of CPU especially when changing tracks or when fast forwarding you can see a decent delay before it resumes playback(or changes tracks) when you release the fast forward button etc but Opus is basically useable on my e200 series v1 unlike AAC-HE.
Opus is comparable to AAC-LC in performance, we just haven't optimized it as well as AAC.
You can use AAC-LC, just not AAC-HE, which is a different and much more complex format. Configure your encoder to output LC and you won't have problems.
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