How to broadcast like on Instagram?

Question

RTMP

Good day! It is required to make a broadcast of two users as in instagram. That is, two users communicate, everyone else watches them. I dug in the direction of WebRTC, but as I understand this topic is only for communication between users. Now I'm digging RTMP, an option to create two broadcasts, and display both broadcasts on one screen. In general, what is the right way to do all this? In which direction to dig? Are there ready-made solutions? Thanks in advance!

P.S. Broadcasts will be sent only from the web, and both web and mobile applications can receive

Answer 1

Make 2 broadcasts, glue, output to the desired format for users.
For example via ffmpeg or vlc