Cool project! I've done similar things with Kurento acting as a WebRTC peer to proxy WebRTC --> RTMP before but this is a lot more lightweight.
One thing I'd love to see at some point is a project that compiles FFMpeg's transmuxing code to WASM such that the WebM --> FLV conversion could be done client-side. That way the server-side portion would be as simple as proxying the WebSocket to a TCP socket for the outgoing RTMP traffic.
Hello, I'm the author here, thanks for liking the project! I'm not aware of Kurento prior to your post, it seems pretty nifty, good to explore for future projects!
Getting the client to do the heavy lifting while the server acts solely as a relay is a really good idea. In my use case, however, I have a flutter client that's not capable of doing that at the moment, perhaps that's something that could be explored further in the future.
One thing I'd love to see at some point is a project that compiles FFMpeg's transmuxing code to WASM such that the WebM --> FLV conversion could be done client-side. That way the server-side portion would be as simple as proxying the WebSocket to a TCP socket for the outgoing RTMP traffic.