I have a peer to peer videoconference app using simpleWebRTC and signalmaster for signaling. When more than 4 users connects the stress it causes on the network and the TURN server is too big, so I was thinking, is it possible to implement a MCU in this case? What would it take to do it?
Is it possible to implement a MCU with SimpleWebRTC and signalmaster? How?
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For more than 4 participants, full mesh (connecting each participant with everyone else peer-to-peer) is impractical. If there are
nparticipants, then each of them needs to haven - 1outgoing andn - 1incoming video streams, which quickly saturates the bandwidth, especially on mobile.An SFU, for example Janus, forwards packets between call participants. The advantage of the SFU for group calls is that each participant needs to push their video stream only once - to the SFU - which then forwards it to everyone else. There are still
n - 1incoming streams for each participant though.An MCU is capable of combining multiple video streams into one, so each participant ends up with
1outgoing video stream and1incoming composite video stream. To produce a composite video stream out ofn - 1individual ones, an MCU needs to re-encode video in realtime, which makes it a CPU hog.I would suggest giving Janus (SFU) a try first and seeing how that works for you.