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

Codecs Support

CDN

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: https://stackoverflow.com/questions/tagged/recordrtc
• Email: muazkh => gmail

Credits

Spec & Reference

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

Who is using RecordRTC?

License

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