RTP Forwarding Live room to Streaming plugin with simulcasting

General
1

I think i might be missing something from the documentaions both on Streaming plugin and videoroom plugin. I am new to janus and webrtc trying to learn how it works.

I am trying to forward rtp streams from videoroom to streamplugin with simulcasting on:

stream mount point:

{
                request: 'create',
                id: streamID,
                type: 'rtp',
                name: 'new_room',
                description: 'Bubble (' + roomID + ')',
                data: false,
                is_private: false,
                videosimulcast: true,
                media: [{
                    type: "audio",
                    mid: "0",
                    port: audioPort,
                    pt: 111,
                    label: "Audio stream",
                    codec: "opus"
                }, {
                    type: "video",
                    mid: "1",
                    port: videoPort,
                    label: "Video stream",
                    pt: 100,
                    codec: "vp8"
                }]
            }

rtp_forward:

{
            request: 'rtp_forward',
            room: roomId,
            publisher_id: publisher_id,
            host: mountPosintip,
            streams: [{
                    mid: '0',
                    port: aport
                },
                {
                    mid: '1',
                    port: vport,
                    simulcast: true
                }
            ],
        }

I do not get video in the streaming plugin, only audio. I start getting video when i open the video room in the videoroom plugin. But when i close it it also disapear after some times. Also i cannot change to High/Medium streams.

2

Both the mountpoint and the RTP forwarder must use the port/port2/port3 (port_2 and port_3 in the VideoRoom) functionality, since each simulcast substream must be sent separately from the others. You’re doing a weird mix where you’re only sending/receiving a single substream. The docs explain how, if you look for the keywords I mentioned.

3

Thanks for quick repy. I rechecked the videoRoom plugin for ports. I am sure there is something i am not understanding from the documentation. Kindly help me point it out.

Mount Point

{
                request: 'create',
                id: streamID,
                type: 'rtp',
                name: 'new_room',
                description: 'xxx (' + roomID + ')',
                data: false,
                is_private: false, 
                media: [{
                    type: "audio",
                    mid: "0",
                    port: audioPort,
                    pt: 111,
                    label: "Audio stream",
                    codec: "opus"
                }, {
                    type: "video",
                    mid: "1",
                    port: videoPort,
                    videoport2: videoPort + 2,
                    videoport3: videoPort + 4,
                    label: "Video stream",
                    pt: 100,
                    codec: "vp8",
                    videosimulcast: true, //i added to see what will change
                    simulcast: true //i added to see what will change
                }]
            }

RTP Forwarding:

.....
streams: [{
                    mid: '0',
                    port: aport
                },
                {
                    mid: '1',
                    port: vport,
                    pt: 100,
                    port_2: vport + 2,
                    pt_2: 100,
                    port_3: vport + 4,
                    pt_3: 100,
                    simulcast: false
                }
            ],

forwarders: [
    {
      stream_id: 4155480195,
      host: ip,
      port: 25102,
      type: 'audio'
    },
    {
      stream_id: 2745133396,
      host: ip,
      port: 19981,
      type: 'video',
      pt: 100
    },
    {
      stream_id: 2179275507,
      host: ip,
      port: 19983,
      type: 'video',
      pt: 100,
      substream: 1
    },
    {
      stream_id: 2638917353,
      host: ip,
      port: 19985,
      type: 'video',
      pt: 100,
      substream: 2
    }
  ],

From the streaming plugin example, i get simulcast and only receiving the LOW Simulcast only, i cannot change to Medium and High.

When i stop and watch the stream again/ or switch substream, i get

We need a PLI for the simulcast context

4

That’s because you’re passing videoport2 and videoport3 to create: with the new API it’s just port2 and port3 (you’re already passing port for instance, which is the low res you’re indeed getting).

5

changed to port port2 and port3 while creating mountpoint. I keep getting We need a PLI for the simulcast context when i stop and watch again the stream

6

You didn’t configure RTCP. Plenty of posts here that talk about that, but again, the documentation will tell you how to use it on both sides.

7

Thanks, I was able to get it working after setting rtcp_port and rtcpport both on videoroom and streaming plugin.

1 Like