We are implementing one-to-many WebRTC broadcasting via Wowza Media Server.
One RTMP stream can be published to Wowza Media Server and available across multiple WebRTC endpoints and Wowza endpoints.
Please see the following scheme below.
The coding part is already done and we plan to release the feature at May 2014.
Please leave your feedback here if you have any other requirements related Wowza and WebRTC support.
Read lines - RTP or SRTP media streams
Blue lines - HTML5 Websocket signaling