WebRTC bandwidth requirements
Does anyone know what are WebRTC bandwidth minimal requirements? I'm interested in what are the values with or without video and for different video resolutions. I'm especially interested in a two party conference, but if you know the values per party it's also good.
If you have actual metrics is nice, but also if you know how can I theoretically calculate this is also good.
Also, different browsers have different bandwidth requirements?
Answer
The bandwidth requirements are almost the same as the bandwidth requirement for opus and vp8. Real time audio typically has a bitrate of 40-200kbit/s. Video requires at least 200 kbit/s (500kbit/s if you want to see people's faces).
According to webrtc-experiment the minimum bandwidth for opus is 6kbit/s and for vp8 100kbits/s. So in total that makes 106kbit/s but when you account for the overhead of the webrtc protocol stack and constantly varying network conditions I would guess that 200kbit/s is the minimum if one wants stable video and audio.
Chrome and Firefox both use opus and vp8 so the bandwidth requirements should be the same. Although I don't have any hard data to prove it.
You can see the current traffic generated by webrtc by going to chrome://webrtc-internals and inspecting all the charts.