Support and General Use > Audio Playback, Database and Playlists
AAC / MP4 playback
wintermute23:
According to the Wiki, Rockbox can play AAC / MP4 files, but (many months ago) I downloaded episodes of a podast in .m4a format which included chapter marks, and I needed to transcode them to MP3 before Rockbox could play them.
Is AAC support moderately new, so that it would be worth trying again? Are only certain file extensions recognised, such that I'd only need to rename the files rather than transcoding them? Are chapter marks in AAC files supported?
Thanks for your help.
GodEater:
Have you tried searching through the posts in this very forum for posts about AAC playback ?
wintermute23:
I have been doing that, yes. My research indicates that AAC support was patchy in 2006, chapter support didn't exist in early-mid 2007, and that HE-AAC support is too processor intensive to implement in most targets.
All of which explains why I was having problems back in the day, but doesn't do a great deal to tell me if I'll still have problems if I try again, or what step I can take to work around those problems.
GodEater:
So you've found that AAC isn't that new at all, not even the chapter support, and that HE-AAC probably won't ever be supported because of how much work it is on the processor.
"Trying Again" would mean what? Downloading a current build, and trying a .aac file with it to see if it's any different. I suspect not as I don't think anyone's done much work on the AAC codec for a while now (other than a few minor bug fixes IIRC).
The only way to "work around" the problem that I can think of would be to use a different codec.
wintermute23:
--- Quote from: GodEater on May 29, 2008, 09:33:38 AM ---So you've found that AAC isn't that new at all, not even the chapter support
--- End quote ---
What do you mean "chapter support isn't new"? Does that mean that chapter marks are supported now?
--- Quote from: GodEater on May 29, 2008, 09:33:38 AM ---"Trying Again" would mean what? Downloading a current build, and trying a .aac file with it to see if it's any different. I suspect not as I don't think anyone's done much work on the AAC codec for a while now (other than a few minor bug fixes IIRC).
--- End quote ---
It would help if I knew how Rockbox decided which codec to use; does it use a magic number (in which case, file extension is irrelevant), or does it base its decision on the file extension (in which case, changing the extension might just make it work)?
Clearly, I erred in believing that there was a possibility that someone might have been working on what was clearly a known issue. But it's been my experience of Rockbox that it's under active development, and that things can change over the course of a year or two, so I thought I would see if anyone had any more recent information that might prove helpful. Sorry I wasted your time when I should have just assumed that the two-year-old information I'd found would still be relevant.
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