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+  Rockbox Technical Forums
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| |-+  Audio Playback, Database and Playlists
| | |-+  "enhanced" aac podcasts
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Author Topic: "enhanced" aac podcasts  (Read 9698 times)

michael.conner

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"enhanced" aac podcasts
« on: December 01, 2006, 06:58:44 PM »
Is there any way to get these to work under Rockbox (other than transcoding to another format)? foobar2k treats them as normal aac files, but Rockbox goes to the WPS and then immediately returns to the file browser window.  
« Last Edit: December 01, 2006, 07:00:33 PM by michael.conner »
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Offline Llorean

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Re: "enhanced" aac podcasts
« Reply #1 on: December 01, 2006, 07:46:05 PM »
What exactly do you mean by enhanced? The word enhanced in quotation marks doesn't mean much on its own.
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michael.conner

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Re: "enhanced" aac podcasts
« Reply #2 on: December 01, 2006, 08:02:04 PM »
Quote from: Llorean on December 01, 2006, 07:46:05 PM
What exactly do you mean by enhanced? The word enhanced in quotation marks doesn't mean much on its own.

Good point.  Enhanced podcasts are ones that have embedded pictures, chapter markers (so you can skip forward within the track), etc., within the M4A file.
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Offline bk

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Re: "enhanced" aac podcasts
« Reply #3 on: December 01, 2006, 08:25:42 PM »
See this thread: http://forums.rockbox.org/index.php?topic=7288.0

The 'enhanced' podcasts I've tried show similar metadata errors with mp4dump.
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Offline bk

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Re: "enhanced" aac podcasts
« Reply #4 on: December 03, 2006, 12:31:59 PM »
Thanks to the recent commit ("3 Dec 13:51: Magnus Holmgren: Remove some unneeded code that caused problems for enhanced AAC files.") my enhanced podcasts now load and display metadata normally. Unfortunately they bomb out with a codec failure before the audio starts playing.
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Offline Lear

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Re: "enhanced" aac podcasts
« Reply #5 on: December 04, 2006, 04:16:37 AM »
You sure you tested a build with the fix? Before that fix, it would load and display metadata properly, but "bomb out" with a codec failure...
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Offline bk

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Re: "enhanced" aac podcasts
« Reply #6 on: December 04, 2006, 08:13:27 AM »
No, before that fix it wouldn't load at all. It would be skipped completely and the next track would be played.
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Offline Lear

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Re: "enhanced" aac podcasts
« Reply #7 on: December 04, 2006, 08:22:53 AM »
Hm... Do you have a link to a podcast that shows the problem? The change I did was for the codec only, so it must be that the fix only solved part of the problem. It worked fine for the podcast I tested with though.
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Offline bk

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Re: "enhanced" aac podcasts
« Reply #8 on: December 04, 2006, 09:04:02 AM »
Sure. http://75minutes.dreamhosters.com/audio/75minutes_69.m4a

Thanks for working on this.
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Offline Lear

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Re: "enhanced" aac podcasts
« Reply #9 on: December 04, 2006, 10:21:20 AM »
Ah, that podcast fails for an entirely different reason - it's too long. :)

That's a known limitation in Rockbox. A table that is used during decode - and to calculate seek positions - is too large. I think it is possible to reduce the size of that table, but I haven't looked closer at it yet.
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michael.conner

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Re: "enhanced" aac podcasts
« Reply #10 on: December 04, 2006, 01:53:33 PM »
Here's another one:

http://media.scifi.com/battlestar/downloads/podcast/m4a/308/bsg_episode_308_commentary_enhanced.m4a
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Offline Lear

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Re: "enhanced" aac podcasts
« Reply #11 on: December 05, 2006, 04:03:58 AM »
Quote from: michael.conner on December 04, 2006, 01:53:33 PM
Here's another one:

http://media.scifi.com/battlestar/downloads/podcast/m4a/308/bsg_episode_308_commentary_enhanced.m4a

"The page you requested was not found."

However, if it is long (a bit over one hour), it is likely to fail for the same reason.
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michael.conner

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Re: "enhanced" aac podcasts
« Reply #12 on: December 05, 2006, 10:05:59 AM »
That's really weird about the link to that podcast I posted not working.  I clicked on it a few times just now, and 1 out of every 3 or 4 times, it would work -- the other times I'd get the "page not found error."

If it'd be useful, I can post what mp4dump says about the file.   The podcast is only 45 minutes or so.
« Last Edit: December 05, 2006, 10:30:23 AM by michael.conner »
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Offline Lear

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Re: "enhanced" aac podcasts
« Reply #13 on: December 06, 2006, 11:17:03 AM »
Indeed, after several tries, I finally got it. This one fails because of an "unexpected" file structure. The metadata parser seems to handle it well, but the one in the codec isn't quite as flexible. Shouldn't be that hard to fix, I think, but I need to examine the file in more detail first.
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michael.conner

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Re: "enhanced" aac podcasts
« Reply #14 on: December 06, 2006, 04:59:47 PM »
The latest CVS fixed it.   Thanks!
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