[Live-devel] About DESCRIBE command

[Ross Finlayson]

>Hello,
>I have started OpenRTSP with -V option in the client side and the 
>testOnDemandRTSPServer in the server side, the stream play OK on stdout 
>and I get this SDP description:
>v=0
>o=- 1081262071921000 1 IN IP4 193.95.33.29
>s=Session streamed by "testOnDemandRTSPServer"
>i=mpeg1or2AudioVideoTest
>a=tool:LIVE.COM Streaming Media v2004.02.04
>a=type:broadcast
>a=control:*
>t=0 0
>m=video 0 RTP/AVP 32
>c=IN IP4 0.0.0.0
>a=control:track1
>m=audio 0 RTP/AVP 14
>c=IN IP4 0.0.0.0
>a=control:track2
>
>my question is why c lines are with IP address 0.0.0.0?????

This (along with the port number 0 in the "m=" lines) tells the clients 
that this stream will be a *unicast* stream, and that the destination 
address (and port number) needs to be assigned later, using the subsequent 
RTSP "SETUP" command.  (See RFC 2326, section C.1.7.)

It's only for multicast streams that the destination address and port 
number are known in advance.


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