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Re: RTP over RTSP (TCP) support in QuickTime

We use RTSP/RTP Interleave in the Orban/Coding Technologies AAC/aacPlus Windows Media Plugin, as well as HTTP Tunneling with QTSS/DSS connections.

Although Interleave is good behind many NAT networks, it can still be easily content filtered, and that is what makes HTTP Tunneling better. It is like an infinite web page, or very close to it.

Unfortunately, although a decent protocol, Reliable UDP fails to connect through just about every consumer NAT Firewall I have tried recently. UDP is just not for the public Internet or any kind of congested/saturated networks.

-greg.
ORBAN.





At 16:53 2007-02-21, Skye Poier Nott wrote: 
Hi, a new question.  I'd like to make sure I'm understanding this
correctly.

It looks like even though DSS/QTSS supports "interleaved RTP" (ie RTP
over the RTSP TCP channel) for NAT traversal, QuickTime Player
doesn't support it!

This seems kind of crazy to me.  From the debug logs, QT Player first
tries RTP over UDP and when that times out, falls back to the special
Apple-only RTP tunneled over HTTP method.  Is that right?  Why does
Apple's server support a nice NAT traversal mechanism that their own
player doesn't implement??

I've verified DSS works fine in RTP over RTSP mode with the openRTSP
client in "-t" mode (which sends a SETUP with Transport: RTP/AVP/ TCP;unicast;interleaved=0-1 and works great behind NAT)

Thanks!
Skye

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__________________________________________________________________________
Greg J. Ogonowski
VP Product Development
ORBAN / CRL, Inc.
Diamond Bar, CA  91765  USA
email@hidden
http://www.orban.com

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References: 
 >RTP over RTSP (TCP) support in QuickTime (From: Skye Poier Nott <email@hidden>)



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