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Re: Airport Express, AirTunes and AAC streams


Michael,

I don't have an answer for yoo, but I do have an observation and a hypothesis...

- First, iTunes cannot transmit to AirTunes anything that it can play. For example, it does not play the audio of QuickTime movie trailers over the AirPort Express (very disappointing, by the way).

- Second, I did you check to see if ANY iTunes radio station plays over AirTunes (I haven't)? If it doesn't, then I'd guess it has something to do with streaming vs. local/progressive download playback, which is how everything else plays in iTunes, even the 30-second previews on iTMS. If other stations do play over AirTunes, then I start wondering about AAC streams vs. MP3. Aren't virtually all Internet radio stations MP3 streams?

Please post to the group what you find out.

More generally, a comment for Apple: AirTunes should be enabled for ANY audio you can output from your Mac, especially QuickTime Player and DVD Player. Moreover, when playing DVD's, AirTunes should support the wireless transmission of 5.1 Dolby Digital AC3 bitstreams over AirPort Express' digital output to a home theatre receiver. --nate
_____________________________________________________
Nate Caplin
Manager, Webcasting & Streaming Media
American Electric Power, 1 Riverside Plz, 19th Fl, Columbus OH 43215
Direct: (614) 716-1993  |  Cell: (614) 832-1993  |  Fax: (614) 716-1980
http://www.aep.com  |  http://www.aepstudios.com  |  http://aeptv  |  http://aepnow



Michael Dreimiller <email@hidden>
Sent by: streaming-server-users-bounces+ncaplin=email@hidden

01/04/2005 11:31 AM

       
        To:        email@hidden
        cc:        
        Subject:        Airport Express, AirTunes and AAC streams



Our college radio station, WCNI, has two AAC streams (32k mono and 32k
stereo) that are generated by QTSS.

<http://video.conncoll.edu/wcni/wcni_live.html>

I'm the Mac tech support guy at the college. I don't have any direct
involvement with the WCNI stream other than I'm the back-up for the
server admin should there be a server problem when he's unavailable.
I've never actually used QTSS other than to restart it when the server
goes down. A friend of mine, a former station director at WCNI,
recently bought an Airport Express and was disappointed to discover
that even though the WCNI stream plays just fine in iTunes it doesn't
play via AirTunes to his Airport Express. This doesn't seem right to me
since, from what I've read, AirTunes can stream anything that iTunes
can play. However, after running out to buy an Express, I was able to
confirm that the WCNI stream does not play via AirTunes.

I did some research on the Apple support site, Google and in the
archives for this list and the streaming-server-users list and found
nothing that suggests there is any limitation in AirTunes regarding AAC
streams. So, I now suspect that there's something about the way the
WCNI streams are set up that is causing this problem. From what I've
been able to determine they are RTSP URLs in a QuickTime wrapper, with
a custom graphic of the station's logo. I'm told they are set up that
way a couple of years ago so that the link on the web page could be
coded to have the stream open in QuickTime Player since they weren't
sure whether there were any other clients that could play AAC streams
at that time. I've noticed that QuickTime Player can play both the .mov
files and the RTSP URL, but iTunes can only play the .mov files. I've
done some searching but I haven't been able to find any AAC streams
(not aacPlus) that will stream via AirTunes.

The server admin is on vacation for another week, so I'd like to try to
find the answer while he's gone so that we can hopefully fix this issue
quickly upon his return.

Questions:

1) Any ideas why the WCNI AAC streams don't play via AirTunes?

2) What are the different ways to serve an AAC stream via QTSS and what
are their benefits and limitations?

3) Is there a way to get an AAC stream that plays via AirTunes?

-Michael Dreimiller
Computer Support Technician
Connecticut College
439- 2093

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 >Airport Express, AirTunes and AAC streams (From: Michael Dreimiller <email@hidden>)



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