Hi, I’m trying to use PlainRtpTransport for ingesting multiple RTP flows from a GStreamer pipeline in order to obtain a Simulcast producer using VP8 codec. I changed the “encodings” array in the rtpParameters structure, adding 3 levels setting scalabilityMode = “S1T1” and adding 3 different ssrc v…

OK OK I see! And actually it’s nice that you are trying this. So: I thought your consumer was not using REMB, my fault. With current just-REMB BWE in mediasoup v3 and the current probation system (based on real video packet retransmissions) your scenario is not possible. Actually you can se…

In order for a Consumer to be able to switch from the current stream to a desired stream, mediasoup must have received Sender Reports for both streams. Otherwise switching is not possible (otherwise lipsync would happen).

I’ll reply to the other questions next week.

Is it correct sending all the RTCP packets (for each level, with his own SSRC) on the same ip:port returned by createPlainRtpTransport?

You must send all RTP from the same port to the transport.tuple.localPort, and all RTCP from the same port to the transport.tuple.localPort (or localRtcpPort if rtcpMux is not enabled). The origin port of RTCP must be the same as in RTP if rtcpMux is enabled, or different if not. And then you can p…

rtcpMux is disabled and comedia is enabled. Since I’m using the transport with comedia enabled, I don’t have to call connect(), right? I’m using: createPlainRtpTransport(comedia=true) this returns ip, rtpPort and rtcpPort that I will use as destinations for sending RTP and RTCP data from the GS…

You can not call connect() if comedia is set so that’s ok. When comedia is enabled and rtcpMux is not (which is its default value), mediasoup won’t send you any RTCP until you send a RTCP to mediasoup. That’s how the transport learns your RTCP port when comedia is enabled and rtcpMux is not.

Everything seems ok: RTCP packets are sent and received. The only problem seems that the DistributeAvailableOutgoingBitrate method doesn’t evaluate correctly the availableBitrate. If REMB are disabled, how the server can evaluate the availableBitrate value? If I force this value to something high…

Right now in Napoli talking about mediasoup v3 :slight_smile: Let me answer in the next days.

Yes, I see from conference streaming :slight_smile: More investigation in progress.

Using PlainRtpTransport for Simulcast ingesting

mediasoup libraries

vpalmisano (Vittorio Palmisano) September 23, 2019, 12:32pm 2

Maybe related to this: Problem using SimulcastConsumer on piped transports
I’m investigating…

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Using PlainRtpTransport for Simulcast ingesting

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