I'd like to apologize in advance as I don't have all the correct vocabulary.

I have about 14 cameras that each output an RTMP stream. The goal is to send these camera streams to a server, and then host these videos for authorized users(like a twitch stream kind of). We also want to be able to combine these stream (mux them?) so we can have multiple videos that can be viewed simultaneously but keep using only 1 stream (we want to be able to do this because we have some bandwidth issues).

My question is: how would i go about muxing those streams together?