WebRTC to RTP to Client Stream

[KittyCatty]

Hello everyone!

I have made some progress  (I believe) in trying to modify a hello world tutorial such that I create the following pipeline WebrtcEndpoint --> RtpEndpoint --> ffplay client

The RtpEndpoint should be only sending the stream and the ffplay client will only be receiving i.e., the stream is unidirectional from KMS to the ffplay client.

(please note. I read many other threads on this forum, Googled, but have not been able to find anything that would lead to the video working).

I have written the following code (server.js modified from the hello world tutorial is attached):

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.

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                                sdp = "v=0";

                                sdp +=  "\no=- 0 0 IN IP4 127.0.0.1";

                                sdp +=  "\nm=video 5000 RTP/AVP 96";

                                sdp +=  "\nc=IN IP4 127.0.0.1";

                                sdp +=  "\na=sendonly"

                                sdp +=  "\na=rtpmap:96 H264/9000";

                                pipeline.create('RtpEndpoint', function(err, rtpEndpoint){

                                                rtpEndpoint.processOffer(sdp);

                webRtcEndpoint.connect(rtpEndpoint, function(err, rtpEndpoint) { if(err) { console.log("Error!"); } });

          });

As you can see above, just for testing purposes, I am currently assuming that ffplay will be running on the same system (localhost) where KMS is hosted.

I then wrote the following SDP file for use by ffplay:

foo.sdp:

v=0

o=- 0 0 IN IP4 127.0.0.1

m=video 5000 RTP/AVP 96

c=IN IP4 127.0.0.1

a=recvonly

a=rtpmap:96 H264/90000

I then run ffplay -i foo.sdp

It just outputs the stuff below and then hangs.

  libavutil      54. 31.100 / 54. 31.100

  libavcodec     56. 60.100 / 56. 60.100

  libavformat    56. 40.101 / 56. 40.101

  libavdevice    56.  4.100 / 56.  4.100

  libavfilter     5. 40.101 /  5. 40.101

  libavresample   2.  1.  0 /  2.  1.  0

  libswscale      3.  1.101 /  3.  1.101

  libswresample   1.  2.101 /  1.  2.101

  libpostproc    53.  3.100 / 53.  3.100

After struggling with it for a while, I decided to perform a more rudimentary check; is the data even arriving at the specified port?

Hence, I used netcat as follows:

$ netcat -l -u 127.0.0.1 5000

(i.e., listen on the UDP port of 5000 on the local host and output any data that arrives to the terminal).

However, the command just hangs, which means there is no data arriving.

Hence, my conclusion is that KMS is not sending the data.

Am I messing up my SDP configuration somehow?  What am I doing wrong? Please help!

I found the following links to be helpful, but ultimately they did not avail to success.

https://doc-kurento.readthedocs.io/en/latest/_static/langdoc/javadoc/org/kurento/client/RtpEndpoint.html

http://builds.kurento.org/release/5.0.3/langdoc/jsdoc/kurento-client-js/RtpEndpoint.js_.html

And many others

[Ivan Gracia]

You have specified in your SDP that it's sendonly, so KMS is ok not sending anything there.

Ivan Gracia

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