RecordRTC.js | Live Demo

WebRTC JavaScript Library for Audio+Video+Screen+Canvas (2D+3D animation) Recording

Chrome Extension or Dozens of Simple-Demos and it is Open-Sourced and has API documentation

A demo using promises:

let stream = await navigator.mediaDevices.getUserMedia({video: true, audio: true});
let recorder = new RecordRTCPromisesHandler(stream, {
    type: 'video'
});
recorder.startRecording();

const sleep = m => new Promise(r => setTimeout(r, m));
await sleep(3000);

await recorder.stopRecording();
let blob = await recorder.getBlob();
invokeSaveAsDialog(blob);

A demo using normal coding:

navigator.mediaDevices.getUserMedia({
    video: true,
    audio: true
}).then(async function(stream) {
    let recorder = RecordRTC(stream, {
        type: 'video'
    });
    recorder.startRecording();

    const sleep = m => new Promise(r => setTimeout(r, m));
    await sleep(3000);

    recorder.stopRecording(function() {
        let blob = recorder.getBlob();
        invokeSaveAsDialog(blob);
    });
});

• Watch a YouTube video presentation/tutorial

Browsers Support

Browser	Operating System	Features
Google Chrome	Windows + macOS + Ubuntu + Android	audio + video + screen
Firefox	Windows + macOS + Ubuntu + Android	audio + video + screen
Opera	Windows + macOS + Ubuntu + Android	audio + video + screen
Edge (new)	Windows (7 or 8 or 10) and MacOSX	audio + video + screen
Safari	macOS + iOS (iPhone/iPad)	audio + video

Codecs Support

Browser	Video	Audio
Chrome	VP8, VP9, H264, MKV	OPUS/VORBIS, PCM
Opera	VP8, VP9, H264, MKV	OPUS/VORBIS, PCM
Firefox	VP8, H264	OPUS/VORBIS, PCM
Safari	VP8	OPUS/VORBIS, PCM
Edge (new)	VP8, VP9, H264, MKV	OPUS/VORBIS, PCM

CDN

<!-- recommended -->
<script src="https://www.WebRTC-Experiment.com/RecordRTC.js"></script>

<!-- use 5.6.2 or any other version on cdnjs -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/RecordRTC/5.6.2/RecordRTC.js"></script>

<!-- NPM i.e. "npm install recordrtc" -->
<script src="node_modules/recordrtc/RecordRTC.js"></script>

<!-- bower -->
<script src="bower_components/recordrtc/RecordRTC.js"></script>

Configuration

const recorder = RecordRTC(stream, {
     // audio, video, canvas, gif
    type: 'video',

    // audio/webm
    // audio/webm;codecs=pcm
    // video/mp4
    // video/webm;codecs=vp9
    // video/webm;codecs=vp8
    // video/webm;codecs=h264
    // video/x-matroska;codecs=avc1
    // video/mpeg -- NOT supported by any browser, yet
    // audio/wav
    // audio/ogg  -- ONLY Firefox
    // demo: simple-demos/isTypeSupported.html
    mimeType: 'video/webm',

    // MediaStreamRecorder, StereoAudioRecorder, WebAssemblyRecorder
    // CanvasRecorder, GifRecorder, WhammyRecorder
    recorderType: MediaStreamRecorder,

    // disable logs
    disableLogs: true,

    // get intervals based blobs
    // value in milliseconds
    timeSlice: 1000,

    // requires timeSlice above
    // returns blob via callback function
    ondataavailable: function(blob) {},

    // auto stop recording if camera stops
    checkForInactiveTracks: false,

    // requires timeSlice above
    onTimeStamp: function(timestamp) {},

    // both for audio and video tracks
    bitsPerSecond: 128000,

    // only for audio track
    // ignored when codecs=pcm
    audioBitsPerSecond: 128000,

    // only for video track
    videoBitsPerSecond: 128000,

    // used by CanvasRecorder and WhammyRecorder
    // it is kind of a "frameRate"
    frameInterval: 90,

    // if you are recording multiple streams into single file
    // this helps you see what is being recorded
    previewStream: function(stream) {},

    // used by CanvasRecorder and WhammyRecorder
    // you can pass {width:640, height: 480} as well
    video: HTMLVideoElement,

    // used by CanvasRecorder and WhammyRecorder
    canvas: {
        width: 640,
        height: 480
    },

    // used by StereoAudioRecorder
    // the range 22050 to 96000.
    sampleRate: 96000,

    // used by StereoAudioRecorder
    // the range 22050 to 96000.
    // let us force 16khz recording:
    desiredSampRate: 16000,

    // used by StereoAudioRecorder
    // Legal values are (256, 512, 1024, 2048, 4096, 8192, 16384).
    bufferSize: 16384,

    // used by StereoAudioRecorder
    // 1 or 2
    numberOfAudioChannels: 2,

    // used by WebAssemblyRecorder
    frameRate: 30,

    // used by WebAssemblyRecorder
    bitrate: 128000,

    // used by MultiStreamRecorder - to access HTMLCanvasElement
    elementClass: 'multi-streams-mixer'
});

MediaStream parameter

MediaStream parameter accepts following values:

let recorder = RecordRTC(MediaStream || HTMLCanvasElement || HTMLVideoElement || HTMLElement, {});

API

RecordRTC.prototype = {
    // start the recording
    startRecording: function() {},

    // stop the recording
    // getBlob inside callback function
    stopRecording: function(blobURL) {},

    // pause the recording
    pauseRecording: function() {},

    // resume the recording
    resumeRecording: function() {},

    // auto stop recording after specific duration
    setRecordingDuration: function() {},

    // reset recorder states and remove the data
    reset: function() {},

    // invoke save as dialog
    save: function(fileName) {},

    // returns recorded Blob
    getBlob: function() {},

    // returns Blob-URL
    toURL: function() {},

    // returns Data-URL
    getDataURL: function(dataURL) {},

    // returns internal recorder
    getInternalRecorder: function() {},

    // initialize the recorder [deprecated]
    initRecorder: function() {},

    // fired if recorder's state changes
    onStateChanged: function(state) {},

    // write recorded blob into indexed-db storage
    writeToDisk: function(audio: Blob, video: Blob, gif: Blob) {},

    // get recorded blob from indexded-db storage
    getFromDisk: function(dataURL, type) {},

    // [deprecated]
    setAdvertisementArray: function([webp1, webp2]) {},

    // [deprecated] clear recorded data
    clearRecordedData: function() {},

    // clear memory; clear everything
    destroy: function() {},

    // get recorder's state
    getState: function() {},

    // [readonly] property: recorder's state
    state: string,

    // recorded blob [readonly] property
    blob: Blob,

    // [readonly] array buffer; useful only for StereoAudioRecorder
    buffer: ArrayBuffer,

    // RecordRTC version [readonly]
    version: string,

    // [readonly] useful only for StereoAudioRecorder
    bufferSize: integer,

    // [readonly] useful only for StereoAudioRecorder
    sampleRate: integer
}

Please check documentation here: https://recordrtc.org/

Global APIs

// "bytesToSize" returns human-readable size (in MB or GB)
let size = bytesToSize(recorder.getBlob().size);

// to fix video seeking issues
getSeekableBlob(recorder.getBlob(), function(seekableBlob) {
    invokeSaveAsDialog(seekableBlob);
});

// this function invokes save-as dialog
invokeSaveAsDialog(recorder.getBlob(), 'video.webm');

// use these global variables to detect browser
let browserInfo = {isSafari, isChrome, isFirefox, isEdge, isOpera};

// use this to store blobs into IndexedDB storage
DiskStorage = {
    init: function() {},
    Fetch: function({audioBlob: Blob, videoBlob: Blob, gifBlob: Blob}) {},
    Store: function({audioBlob: Blob, videoBlob: Blob, gifBlob: Blob}) {},
    onError: function() {},
    dataStoreName: function() {}
};

How to fix echo issues?

1. Set <video>.muted=true and <video>.volume=0
2. Pass audio: {echoCancellation:true} on getUserMedia

Wiki

• https://github.com/muaz-khan/RecordRTC/wiki

Releases

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

Unit Tests

• https://travis-ci.org/muaz-khan/RecordRTC

Issues/Questions?

• Github: https://github.com/muaz-khan/RecordRTC/issues
• Disqus: https://www.webrtc-experiment.com/RecordRTC/#ask
• Stackoverflow: http://stackoverflow.com/questions/tagged/recordrtc
• Email: muazkh => gmail

Credits

Library	Usage
Recorderjs	StereoAudioRecorder
webm-wasm	WebAssemblyRecorder
jsGif	GifRecorder
whammy	WhammyRecorder

Spec & Reference

1. MediaRecorder API
2. Web Audio API
3. Canvas2D
4. Media Capture and Streams

Who is using RecordRTC?

Framework	Github	Article
Angular2	github	article
React.js	github	article
Video.js	github	None
Meteor	github	None

License

RecordRTC.js is released under MIT license . Copyright (c) Muaz Khan.