Support and General Use > Audio Playback, Database and Playlists

AAC-LC files won't load on iPod 5G

(1/1)

m42i:
I synced some Podcasts with iTunes. Rockbox* 3.13 (nothing special) couldn't find any of the AAC-LC (64kbps) files. They play fine with the original firmware.

One example:
http://www.konscience.de/wp-content/uploads/kns017-maertyrer-gegen-copyright.m4a

Rockbox: stable-3.13
iPod: 5G (Video?) 80GB

saratoga:
By "couldnt' find" you mean they don't show up on the device in the file browser?  Or that they don't play when you select them?

m42i:
I mean in the database. I can see the file in the file browser. But on playing it I can see it tries to load and just after the playing screen appears, it disappears again, without showing any text information.

saratoga:
Couple things:

Thats an AAC-HE file rather than AAC-LC, and your player is not fast enough to decode AAC-HE.  I guess it works in the original firmware because Apple ignores the SBR bit and just plays back a low quality version of the stream. 

However, we do support SBR, so while you won't be able to play it in real-time, with enough patience it should still decode.   Running it through the 3.13 sim, it reports that its an ALAC file rather than AAC, so probably something is screwed up with how our code detects the codec type.  I'll file a bug report for this.  In the meantime, probably trying to repack the file with a tool like mp4box into a less weird mp4 stream will fix it, but you still won't be able to decode the file in real-time due to lack of CPU power. 

m42i:
Thank you for filing a bug report and the explanation. I now see my mistake, the meta info does read "HE-AAC / LC".

I guess, I'll have to subscribe to another feed for the time being.

Navigation

[0] Message Index