TL'DR': Pornhub uses mediasoup.
I've read many comments here asking about "how mediasoup is different than XXX" or about "mobile apps". I think the Overview in the website should be self explanatory, I'll just paste a fragment here:
https://mediasoup.org/documentation/overview/
--------------------- Design goals of mediasoup and its client side libraries:
- Be a SFU (Selective Forwarding Unit). - Support both WebRTC and plain RTP input and output. - Be a Node.js module in server side. - Be a tiny JavaScript and C++ libraries in client side. - Be minimalist: just handle the media layer. - Be signaling agnostic: do not mandate any signaling protocol. - Be super low level API. - Support all existing WebRTC endpoints. - Enable integration with well known multimedia libraries/tools.
Use cases:
- Group video chat applications. - One-to-many (or few-to-many) broadcasting applications in real-time. - RTP streaming.