Can multiple VideoRoom publishers RTP into the same mountpoint streaming?

General
1

I’m experimenting with sending multiple publishers from the VideoRoom plugin into a single Streaming mountpoint in Janus.
The idea is that each track (audio/video) would map to a different port inside the mountpoint.

Here’s an example of the mountpoint I created:

{“janus”:“success”,“session_id”:8454872268941504,“transaction”:“Gt5XIidjkj5”,“sender”:1066734851300173,“plugindata”:{“plugin”:“janus.plugin.streaming”,“data”:{“streaming”:“created”,“created”:“mp-8454872268941505”,“permanent”:false,“stream”:{“id”:8454872268941505,“type”:“live”,“description”:“Stream-8454872268941505”,“is_private”:false,“ports”:[{“type”:“audio”,“mid”:“a0”,“port”:10451},{“type”:“audio”,“mid”:“a1”,“port”:14028},{“type”:“video”,“mid”:“v0”,“port”:12842},{“type”:“video”,“mid”:“v1”,“port”:16310}]}}}}

I tried this setup, but it seems the mountpoint only accepts one publisher — the others don’t get through.

Can anyone confirm:

  • Does the Janus Streaming mountpoint support multiple RTP publishers from VideoRoom?

  • Or is it strictly limited to a single publisher?

  • If I need multiple audio/video tracks (from different publishers), what’s the correct approach?

Thanks in advance!

2

The only constraint the Streaming plugin has is that you can’t have multiple sources feed the same port at the same time: they can take turns, but not send RTP packets to the same port. For different ports there’s no constraint, instead: you can definitely have user A send RTP to port X, and user B send RTP to port Y, where X and Y belong to the same mountpoint.

3

Thank your reply.
On the same streaming point(4port), can I call RTP_Forward many times for different publishers

Example:

First publisher join → I call rtp_forward like this:

{
“room”: 6316492184514278,
“feed”: 2451694246213369,
“secret”: “adminpwd”,
“simulcast”: true,
“host”: “127.0.0.1”,
“streams”: [
{
“type”: “audio”,
“mindex”: 0,
“mid”: “0”,
“codec”: “opus”,
“fec”: true,
“audiolevel_ext_id”: 1,
“port”: 15995
},
{
“type”: “video”,
“mindex”: 1,
“mid”: “1”,
“codec”: “vp9”,
“vp9_profile”: “0”,
“playoutdelay_ext_id”: 5,
“port”: 19136
}
]
}

Second publisher join → I call another rtp_forward:

{
“room”: 6316492184514278,
“feed”: 5119743463762836,
“secret”: “adminpwd”,
“simulcast”: true,
“host”: “127.0.0.1”,
“streams”: [
{
“type”: “audio”,
“mindex”: 0,
“mid”: “0”,
“codec”: “opus”,
“fec”: true,
“audiolevel_ext_id”: 1,
“port”: 11962
},
{
“type”: “video”,
“mindex”: 1,
“mid”: “1”,
“codec”: “vp9”,
“vp9_profile”: “0”,
“playoutdelay_ext_id”: 5,
“port”: 18421
}
]
}

4

As I said, as long as you’re sending/forwarding to different port, there’s no trouble. I see simulcast in there, though, so just make sure your trouble doesn’t come from there (simulcast=multiple RTP sessions).