Support and General Use > Audio Playback, Database and Playlists
AAC / MP4 playback
Llorean:
Considering the changelog is, has been, and probably always will be available, the information on what has been developed is as available to you as it is to everyone else. Checking if the information is still relevant is as simple as reading about AAC updates in it.
Or simply spending 15 seconds to copy a problematic M4A/MP4/AAC file over and see if it plays. There are many problems still with the AAC codec, and many, many, many, many things that have been fixed. What exactly is problematic about simply spending a few seconds to test it for yourself?
One of the largest remaining problems is simply that files over a certain size will not play. This is probably what you encountered with your podcasts.
wintermute23:
--- Quote from: Llorean on May 29, 2008, 10:24:14 AM ---Considering the changelog is, has been, and probably always will be available, the information on what has been developed is as available to you as it is to everyone else. Checking if the information is still relevant is as simple as reading about AAC updates in it.
--- End quote ---
The notes on the changelog, while helpful, don't seem to actually answer the questions I have. They're more focused on the technical details of the change that was made, rather than on the ramifications of that change.
--- Quote from: Llorean on May 29, 2008, 10:24:14 AM ---Or simply spending 15 seconds to copy a problematic M4A/MP4/AAC file over and see if it plays. There are many problems still with the AAC codec, and many, many, many, many things that have been fixed. What exactly is problematic about simply spending a few seconds to test it for yourself?
--- End quote ---
Right now, what is problematic is that I'm at work and can't download music files. Rest assured though, when I get home, I plan to spend an hour or so tracking down various AAC files and seeing if I can find any pattern to what works and what doesn't. I was hoping that there would be people here who used played AAC files on a regular basis, or knew a thing or two about their structure, and could offer some advice that would point me ni the right direction. I often find that asking a couple of questions can save me a fair amount of time further down the road.
--- Quote from: Llorean on May 29, 2008, 10:24:14 AM ---One of the largest remaining problems is simply that files over a certain size will not play. This is probably what you encountered with your podcasts.
--- End quote ---
That sounds plausible. As I recall, they were approximately 15-20 minutes in length. Thanks for the help.
Lear:
--- Quote from: wintermute23 on May 29, 2008, 10:19:21 AM ---What do you mean "chapter support isn't new"? Does that mean that chapter marks are supported now?
--- End quote ---
No, chapter marks aren't supported. However, a bookmarked file (typically with the extension .m4b, I think) should be playable.
--- Quote from: wintermute23 on May 29, 2008, 10:19:21 AM ---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)?
--- End quote ---
Rockbox mainly uses the extension, though in some cases additional information is used (e.g., to separate between ALAC and AAC). For AAC, Rockbox supports .m4a, .m4b and .mp4.
--- Quote from: wintermute23 on May 29, 2008, 11:01:15 AM ---That sounds plausible. As I recall, they were approximately 15-20 minutes in length. Thanks for the help.
--- End quote ---
Though 15-20 minutes long files shouldn't be a problem (very old versions of Rockbox might fail though). However, it is difficult to say for sure, as it depends on the structure of certain parts of the metadata in the file...
If you use an "optimized" MP4 file (Foobar has a function for that), Rockbox should be able to handle at least 90 minutes long tracks, if I recall correctly.
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