Airplay bandwidth for MP3s very high and fixed - Canadian TV, Computing and Home Theatre Forums
 
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post #1 of 3 (permalink) Old 2014-05-01, 11:36 PM Thread Starter
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Question Airplay bandwidth for MP3s very high and fixed

I have tried searching the internets without finding the answer to my question. Hoping the gurus here have the answer.

Does anyone have a theory why Airplay (from iTunes on a PC) sends out audio at 140 KBytes/s? Even when the source is 96 kbits/s? I have measured it via my router and on the machine itself. Playing 320 kbits/s MP3 the airplay stream is nearly the same size.

Note this is the outgoing bandwidth only.
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post #2 of 3 (permalink) Old 2014-05-02, 02:00 AM
 
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AirPlay uses ALAC for audio.

Bill
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post #3 of 3 (permalink) Old 2014-05-02, 10:08 AM Thread Starter
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That is it? Five simple words? Dude thank you.

You pointed me in the right direction. Here are some more details for future readers.

http://en.wikipedia.org/wiki/AirPlay
Quote:
The AirTunes part of the AirPlay protocol stack uses UDP for streaming audio and is based on the RTSP network control protocol.[39] The streams are transcoded using the Apple Lossless codec with 44100 Hz and 2 channels encrypted with AES, requiring the receiver to have access to the appropriate private key to decrypt the streams.[40] The stream is buffered for approximately 2 seconds before playback begins, resulting in a small delay before audio is output after starting an AirPlay stream.
Interesting as I have audio > 44000 Hz.
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