=?gb2312?q?=BB=D8=B8=B4=A3=BA=20Re:=20[Live-devel]=20RTSP/UDP?=

[Li bz]

Thanks a lot, Ross.


--- Ross Finlayson <finlayson at live.com>дµÀ:

> 
> >Does it make sense that I use RTSP for the
> connection
> >and then I just use UDP to send data, which means I
> >don't need to make RTP packets?
> 
> This makes sense only in a very special situation:
> - You are sending only a single data stream (i.e.,
> not an audio stream plus 
> a video stream), and
> - The data stream includes timestamps (so you don't
> need the RTP timestamps)
> 
> The most common example of this is streaming MPEG-2
> Transport Streams 
> (e.g., as is commonly done for video-on-demand). 
> MPEG-2 Transport Streams 
> have audio and video multiplexed together, and
> contain ther own timestamps, 
> so they *can* be streamed via raw UDP, without using
> RTP.
> 
> >what is the fast way to do it in
> >testOnDemandRTSPServer.cpp?
> 
> Unfortunately there's no standard way to use RTSP to
> ask for raw-UDP 
> (rather than RTP) streaming.  The LIVE.COM RTSP
> server implementation (and 
> thus "testOnDemandRTPServer") will automatically
> handle requests from 
> certain set-top boxes (notably those made by
> AminoCom) that request raw-UDP 
> streaming of MPEG-2 Transport Stream data.  (These
> set-top boxes handle 
> *only* raw UDP streams, not RTP.)  However, there's
> no guarantee that they 
> will handle other clients that request raw-UDP
> streaming (because, as I 
> noted above, there's no standard way to ask for
> this).
> 
> In general, I don't recommend streaming over raw
> UDP.  Use RTP/RTCP instead 
> - it's the standard.
> 
> 
> 	Ross Finlayson
> 	LIVE.COM
> 	<http://www.live.com/>
> 
> _______________________________________________
> live-devel mailing list
> live-devel at lists.live.com
> http://lists.live.com/mailman/listinfo/live-devel
> 



		
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