Is there any alternative approach to implement WebRTC SFU, to have only 1 upload stream?

Question

I have a server which is able to relay the WebRTC media data from A to B. For the video conferencing, if we go with P2P approach then a mesh network is created. Whenever P2P doesn't work, we can have this relay server.

The main problem is that in the mesh network, the number of upload link is "N - 1" for N participants. Hence the number of connection goes upto N * (N-1). Usually mesh network allows 5-6 stable connections.

Many online sources suggest to implement SFU. If SFU decrypts the media data and then re-encrypts for every peer then that virtually requires a WebRTC component on the server side. Are there any lightweight C/C++ based library which helps in this regard?

Any better alternative strategy for the same?

BTW, I tried to share the same offer to all the peers with their own answer, but as expected it didn't work. The peer gets disconnected after receiving few chunks.

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I have referred below related posts:

• WebRTC - scalable live stream broadcasting / multicasting
• Multi-party WebRTC without SFU
• Can I re-use an "offer" in WebRTC for mulitple connections?

Answer 1

There are quite a few free and open source projects that implement an SFU:

• Jitsi is probably the best known, but it is written in Java, and might therefore be unsuitable in some deployments;
• Janus is written in C; it is small, efficient, and well supported, but might not be the easiest to understand;
• Ion-SFU and Galène are written in Go, and might be easier to adapt to your needs.