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AAC Streaming
Mitzie Mohr
Registered User
Join date: 10 Feb 2007
Posts: 10
12-04-2009 07:47
An internet radio station tells me they are an "AAC shoutcast/icecast format stream" and ask "does Second Life support AAC streaming?"

I cannot receive thier stream http://66.135.37.165:8081/radio4

(on my land or anyone else)

Any ideas?
ElQ Homewood
Sleeps Professionally
Join date: 25 Apr 2007
Posts: 280
12-04-2009 10:19
I'd have to guess that SL doesn't support it. I honestly thought Quicktime did, so went inworld to try it in the Parcel Media audio stream rather than radio, but it still didn't work.
Viktoria Dovgal
…
Join date: 29 Jul 2007
Posts: 3,593
12-04-2009 11:28
There is something a little odd about that one. QuickTime Player coughs up "The URL is not valid." yet iTunes can handle it. :confused: So I guess the next step is to figure out what iTunes does to make QuickTime like it.
Void Singer
Int vSelf = Sing(void);
Join date: 24 Sep 2005
Posts: 6,973
12-04-2009 14:45
SL does not support AAC... only mp3

ETA:
because AAC is a licensed format
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Viktoria Dovgal
…
Join date: 29 Jul 2007
Posts: 3,593
12-04-2009 16:10
QuickTime includes a licensed AAC codec, and if you set the parcel media (not the music stream) to play an AAC audio file, it works fine. It's simply that the handling of the music URL isn't calling QuickTime in a way that can deal with these AAC icecast streams.
Void Singer
Int vSelf = Sing(void);
Join date: 24 Sep 2005
Posts: 6,973
12-05-2009 08:23
my understanding was they used a pared down version of the streaming support...

at any rate, the aac stream is probably he-aac, which can be decoded by the faad/faad2 library (open source support) or current versions of ACTUAL qt/itunes

ETA
(wiki says any format qt will read, but I'm wondering if that's only for actual files and not streams, which has been my experience)
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ElQ Homewood
Sleeps Professionally
Join date: 25 Apr 2007
Posts: 280
12-06-2009 01:39
That's true, I hadn't considered that because it's been a while, but live video streaming has run into that problem, file works but not a stream of the same type.
Hooten Haller
Wonder and Joy
Join date: 5 Feb 2007
Posts: 45
12-06-2009 05:58
As nearly as I can tell, licensing the QuickTime library is free and it includes AAC decoding. That seems odd since Apple has to pay Dolby 74c per license (comparable, by the way to the 75c charged per license for MP3, a worse-sounding format).

http://daringfireball.net/2007/04/some_facts_about_aac

I also checked Apple's QuickTime licensing and API pages, as well as Wikipedia.
Void Singer
Int vSelf = Sing(void);
Join date: 24 Sep 2005
Posts: 6,973
12-06-2009 19:47
there are open source libraries for decoding both, although the mp3 has many more available, and more open source libraries for encoding...
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