WebRTC is an amazing technology, when it works. With just a few lines of JavaScript code, you get audio and video streams with ease in your web page, and with the help of our open source Janus WebRTC gateway you can play with those media to do pretty much what you like. That said, WebRTC can also be incredibly frustrating to novices when it DOESN’T work, that is, whenever you think you did everything right and instead nothing works: you can see others, but others cannot see you, or all you see is a black screen where you expected a…