MultiStreamsMixer.js | LIVE DEMO

• Mix Multiple Cameras or Videos
• Mix Multiple Microphones or Audios (Mp3/Wav/Ogg)
• Mix Multiple Screens or Screen+Video
• Mix Canvas 2D Animation + Camera + Screen
• and GET SINGLE STREAM!!

All Demos

1. Main Demo: https://www.webrtc-experiment.com/MultiStreamsMixer/
2. Record Multiple Cameras
3. Record Camera+Screen

Pass multiple streams (e.g. screen+camera or multiple-cameras) and get single stream.

Link the library

<script src="https://www.webrtc-experiment.com/MultiStreamsMixer.js"></script>

Or link specific build:

• https://github.com/muaz-khan/MultiStreamsMixer/releases

Or install using NPM:

npm install multistreamsmixer

And import/require:

const MultiStreamsMixer = require('multistreamsmixer');
import MultiStreamsMixer from 'multistreamsmixer';

How to mix audios?

const audioMixer = new MultiStreamsMixer([microphone1, microphone2]);

// record using MediaRecorder API
const recorder = new MediaRecorder(audioMixer.getMixedStream());

// or share using WebRTC
rtcPeerConnection.addStream(audioMixer.getMixedStream());

How to mix screen+camera?

screenStream.fullcanvas = true;
screenStream.width = screen.width; // or 3840
screenStream.height = screen.height; // or 2160 

cameraStream.width = parseInt((20 / 100) * screenStream.width);
cameraStream.height = parseInt((20 / 100) * screenStream.height);
cameraStream.top = screenStream.height - cameraStream.height;
cameraStream.left = screenStream.width - cameraStream.width;

const mixer = new MultiStreamsMixer([screenStream, cameraStream]);

rtcPeerConnection.addStream(mixer.getMixedStream());

mixer.frameInterval = 1;
mixer.startDrawingFrames();

btnStopStreams.onclick = function() {
    mixer.releaseStreams();
};

btnAppendNewStreams.onclick = function() {
    mixer.appendStreams([anotherStream]);
};

btnStopScreenSharing.onclick = function() {
    // replace all old streams with this one
    // it will replace only video tracks
    mixer.resetVideoStreams([cameraStreamOnly]);
};

How to mix multiple cameras?

const mixer = new MultiStreamsMixer([camera1, camera2]);

rtcPeerConnection.addStream(mixer.getMixedStream());

mixer.frameInterval = 1;
mixer.startDrawingFrames();

API

1. getMixedStream: (function) returns mixed MediaStream object
2. frameInterval: (property) allows you set frame interval
3. startDrawingFrames: (function) start mixing video streams
4. resetVideoStreams: (function) replace all existing video streams with new ones
5. releaseStreams: (function) stop mixing streams
6. appendStreams: (function) append extra/new streams (anytime)

TypeScript / Angular

import { MultiStreamsMixer } from 'yourPath/MultiStreamsMixer';
let mixer = new MultiStreamsMixer([stream1,stream2]);
mixer.appendStreams(stream3);
let mixed = mixer.getMixedStream();

P.S: pollyfills are removed (except for AudioContext) use adapter instead.

Access <canvas> or <video> using querySelector

var canvas = document.querySelector('canvas.multi-streams-mixer');
var videos = document.querySelectorAll('video.multi-streams-mixer');

canvas.style.opacity = .1;

API

// default elementClass is "multi-streams-mixer"
var instance = new MultiStreamsMixer(arrayOfMediaStreams, elementClass);

MultiStreamsMixer.prototype = {
	// get readonly MediaStream
	getMixedStream: function() {},

	// add more streams
	appendStreams: function(arrayOfMediaStreams) {},

	// replace with set of your own streams
	resetVideoStreams: function(arrayOfMediaStreams) {},

	// clear all the data
	clearRecordedData: function() {}
};

License

MultiStreamsMixer.js is released under MIT licence . Copyright (c) Muaz Khan.