Hacker News Reader

Does anyone know of any books or resources that focus on the concept of a back-end application that allows you to stream video from A to Z in a performant way like Google Meet or Jitsi?

I find it exciting to have a tool that allows up to 100 participants at once right in the browser.

View on HN

I don't think there is comprehensive information about that. We all do pretty much the same, implement the Selective Forwarding Unit (SFU) model.

The idea is the SFU will receive a number of streams for each user (usually up to 3, in low, mid and high resolutions) and then it will forward one of them to each other participant depending on things like available bandwidth, requested video size, etc.

There are a number of Open Source implementations available, in case you want to study it deeper:

- Jitsi videobridge: https://github.com/jitsi/jitsi-videobridge

- Janus: https://github.com/meetecho/janus-gateway

- mediasoup: https://github.com/versatica/mediasoup

- (p)ion: https://github.com/pion/ion-sfu

- meddoze: https://github.com/medooze/media-server-node

And probably more!

Jitsi was (is?) based on WebRTC. Usual challenges about conferencing is, beyond 2 members, having n*m bandwidth is bad, and a solution is to centralize the streams.

Reply on news.ycombinator.com