WebRTCRecorder
A light library to record webgl into video by using webrtc.
It could be used with any engines and the behaviours are total the same.
Examples
PIXI.js: https://valeerajs.github.io/WebRTCRecorder/examples/pixi/index.html
THREE.js: https://valeerajs.github.io/WebRTCRecorder/examples/three/index.html
WebGL: https://valeerajs.github.io/WebRTCRecorder/examples/webgl/index.html