[Live-devel] question about rtsp server

[Ross Finlayson]

At 02:03 AM 6/15/04, you wrote:
>When I setup rtsp server by testOnDemandRTSPServer, it send mpeg1or2 
>stream on audio or video subsession.I want to know if it can send mpeg1or2 
>stream on only one subsession(include audio or video, not separate).Does 
>live library supply this function?

Yes, RTP defines a way to stream an entire MPEG Program Stream in a single 
RTP stream.  See RFC 2250, section 2, and RFC 3555, section 4.2.11.

To implement this using the LIVE.COM code, you would use a 
"ByteStreamFileSource" as the source.  (You won't need a separate 'framer' 
object, because the chunks of data that you'll be sending can be of 
arbitrary size.)  For the sink, you would use a "SimpleRTPSink", with a 
dynamic RTP payload type (i.e., one >= 96), a RTP timestamp frequency of 
90000, a sdpMediaTypeString of "video", and a rtpPayloadFormatName of "mp2p".

To use this with "testOnDemandRTSPServer", you will need to define and use 
your own subclass of "FileServerMediaSubsession".  (See 
"MPEG2TransportFileServerMediaSubsession" for a model of how to do this.)

A warning, however: If you do this, you'll probably find that few media 
players will be able to play the stream.  Most RTP media players support 
receiving audio and video in separate streams, but few support receiving an 
entire MPEG Program Stream as a single RTP stream.


	Ross Finlayson
	LIVE.COM
	<http://www.live.com/>