WebRTC Broadcasting Recording

This repository is not a peer-to-peer example. The server totally cares signaling and broadcasting

Features

• Multiple Broadcaster, multiple subscribers architecture (1:N SFU)
• Subscribers listen events Broadcaster Connected, Broadcaster Disconnected
• Recording Broadcaster's Tracks as .mp4 using ffmpeg
• Go-lang SFU server, web-based demostration client
• Signaling (Offer, Answer) using gorilla websocket

How To Run

Dockerfile

You need to install Docker (Windows, Linux, MacOS) on your computer.

cd WebRTC-Broadcast-Recording
docker-compose up

You also change exposed port using docker-compose's port-forwarding option. Our Dockerfile will automatically install go-lang and FFmpeg on docker image.

Go compiling

If you didn't install FFmpeg, you need to install your own version of FFmpeg binaries. On your command line, ffmpeg command should be available. FFmpeg is needed to record your video and audio track as a MPEG4 media file.

cd src/github.com/bic4907/webrtc   
go run main.go

Architecture

Our repository is Server (Go)-Client (Javascript) architecture. WIP

Hub Events

Some events regarding broadcasting service. Please check out hub.go source code.

Register A broadcaster event when a broadcaster joined to the server. The broadcaster offers to begin audio/video track and negotiate with server. When broadcaster begin to send RTC packet, BroadcastBroadcasterEntered method will be executed. This method will notify to users that already connected to server via a websocket event. Then, clients and server will re-negotiate to make new media track.
When the broadcaster starts to send RTC packets, the server will record video/audio using ffmpeg.

Unregister A broadcaster event when a broadcaster exited from the server. This event will execute BroadcastBroadcasterExited method, and the server will make user to remove tracks from player.

Subscribe A subscriber event when a receiver joined to the server. The hub will find whether the broadcaster is existing and offer video/audio tracks to user via websocket. If the broadcaster not joined yet, the server do not anything and the user will be wait for the broadcaster join.

Unsubscribe A subscriber event when a receiver exited from the server. The hub will remove user from a room's user list.

Broadcast A broadcaster event when a broadcaster sends a RTC packet. The hub publishes this packet to the users where the broadcaster have opened.

Author

• In-chang Baek

Special thanks

• JooYoung Lim

References

• pion/webrtc
• pion/example-webrtc-applications
• gorilla/websocket

Those are most useful materials for you understanding webrtc sigaling paradism.
Keep in your mind that websocket communication is just one of lots of signaling methods.