You can build cool stuff with WebRTC in five minutes.
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A note on connectivity issues
If you see black videos from peers or the connection state displayed ontop of those videos
either hangs in Connecting to peer... or changes to Connection failed, a direct peer-to-peer connection could not be established.
This typically means that a TURN server is required. This tutorial explains the problem.
You can check if those peers can connect each other on talky.io which runs a TURN server.
Want to know more about how some of these features work? Check the documentation