[Live-devel] How can I receive RTCP message when usingSimpleRTPSink

[Dixon Siu]

Hi,

Million thanks to Ross, I can send Program Stream from a server. I have
tested using my own receiver and write the stream to a file. Both VLC and
WMP can view the MPEG file without any problem. Moreover, I did receive RTCP
messages using my own receiver. If anyone wants the sample code, feel free
to contact me at dixonsiu at mediaglue.co.jp.

Regards,
Dixon Siu

> -----Original Message-----
> From: live-devel-bounces at ns.live.com
> [mailto:live-devel-bounces at ns.live.com]On Behalf Of Ross Finlayson
> Sent: Thursday, May 20, 2004 7:44 AM
> To: LIVE.COM Streaming Media - development & use
> Subject: Re: [Live-devel] How can I receive RTCP message when
> usingSimpleRTPSink
>
>
>
> >In my program, I have the following code to create a Program Stream
>
> No, for the code you've writtenn, the input source should be a
> *Transport*
> Stream, not a Program Stream.  (To stream a Program Stream, you
> use a MIME
> subtype of "mp2p" (rather than "mp2t"), and must use a dynamic
> payload type
> (i.e., >= 96, *not* 33).)
>
> >and send
> >to a SimpleRTPSink.
> >
> >   aSimpleRTPSink = SimpleRTPSink::createNew(*env, rtpGroupsock,
> 33, 90000,
> >"video", "mp2t");
> >   // Create (and start) a 'RTCP instance' for this RTP sink:
> >   const unsigned maxCNAMElen = 100;
> >   unsigned char CNAME[maxCNAMElen+1];
> >   gethostname((char*)CNAME, maxCNAMElen);
> >   CNAME[maxCNAMElen] = '\0'; // just in case
> >
> >   // Create (and start) a 'RTCP instance' for this RTP sink:
> >   const unsigned totalSessionBandwidth = 4500; // in kbps; for RTCP b/w
> >share
> >
> >   RTCPInstance::createNew(*env, rtcpGroupsock,
> >               totalSessionBandwidth, CNAME,
> >               aSimpleRTPSink, NULL /* we're a server */, isSSM);
> >   // Note: This starts RTCP running automatically
> >   aSimpleRTPSink->startPlaying(*fileSource, afterPlaying,
> aSimpleRTPSink);
>
> This code is correct - provided that your input source is a Transport
> Stream (not a Program Stream).
>
> >Then I use VLC to view the content using
> "udp://@239.255.42.42:6666". I can
> >view the stream with noises since I am transferring a program
> stream using a
> >transport stream format. But I didn't observe any RTCP RR messages.
>
> This is the fault of VLC.  It's handling of "udp://" URLs is a hack, and
> doesn't use the LIVE.COM code.  It just ignores the RTP header (if
> present), and doesn't process or send back RTCP at all.
>
>
> 	Ross Finlayson
> 	LIVE.COM
> 	<http://www.live.com/>
>
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> live-devel at lists.live.com
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>
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