That's just not true anymore these days. I've used WebRTC between Firefox, Safari, and Chrome without any issues.
> only if you use the same kind of software and codecs, for example Chromium, that requires dozens of gigabytes of disk space and much RAM, CPU time to build it.
There seem to be non-browser implementations [1] [2], although I can't vouch for their quality.
[2] https://github.com/awslabs/amazon-kinesis-video-streams-webr...