Group calling architectures in WebRTC: MCU, SFU & P2P

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I think the graphic is a bit misleading. Ruling out the old and expansive MCU technology, which is w.r.t the "load" having to be handled by each communicating part the optimal solution, it seems at the first glance, that the full mesh is the technology which fits best. I haven't viewed the rest of the video, but the correct math to calculate the load having to be handled by each communicating path would IMHO be like this: Mesh scales with N(N-1) and SFU with N+1. Example: In a full mesh of 10 parties each party would have to deal with 90 unidirectional streams while in an SFU solution each party would only have to deal with 11 (not to talk about MCU, where it would be 10). So with this in mind SFU scales way better than full Mesh at scale

neilyoung
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Is it me or there is a mistake on the mesh total's bandwidth? (4+4) * 5 = 40, not 20.

kajikabis