MediaStreamRecorder.js - Demos

A cross-browser implementation to record audio/video streams:

1. MediaStreamRecorder can record both audio and video in single WebM file on Firefox.
2. MediaStreamRecorder can record audio as WAV and video as either WebM or animated gif on Chrome.

MediaStreamRecorder is useful in scenarios where you're planning to submit/upload recorded blobs in realtime to the server! You can get blobs after specific time-intervals.

Demos using MediaStreamRecorder.js library

Experiment Name	Demo	Source Code
Audio Recording	Demo	Source
Video Recording	Demo	Source
Gif Recording	Demo	Source
MultiStreamRecorder Demo	Demo	Source

---

There is a similar project: RecordRTC! Demo - Documentation

How to link scripts?

You can install scripts using NPM:

npm install msr

# or via "bower"
bower install msr

Now try node server.js and open https://localhost:9001/

Test on NPM

var MediaStreamRecorder = require('msr');

console.log('require-msr', MediaStreamRecorder);

console.log('\n\n-------\n\n');

var recorder = new MediaStreamRecorder({});
console.log('MediaStreamRecorder', recorder);

console.log('\n\n-------\n\n');

var multiStreamRecorder = new MediaStreamRecorder.MultiStreamRecorder({});
console.log('MultiStreamRecorder', multiStreamRecorder);

• Live NPM test: https://tonicdev.com/npm/msr

Or try npm-test.js:

cd node_modules
cd msr
node npm-test.js

Then link single/standalone "MediaStreamRecorder.js" file:

<script src="./node_modules/msr/MediaStreamRecorder.js"> </script>

<!-- or bower -->
<script src="./bower_components/msr/MediaStreamRecorder.js"></script>

<!-- CDN -->
<script src="https://cdn.webrtc-experiment.com/MediaStreamRecorder.js"> </script>

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

<!-- or link specific release -->
<script src="https://github.com/streamproc/MediaStreamRecorder/releases/download/1.3.4/MediaStreamRecorder.js"></script>

Record audio+video

<script src="https://cdn.webrtc-experiment.com/MediaStreamRecorder.js"> </script>
<script>
var mediaConstraints = {
    audio: true,    // don't forget audio!
    video: true     // don't forget video!
};

navigator.getUserMedia(mediaConstraints, onMediaSuccess, onMediaError);

function onMediaSuccess(stream) {
    var mediaRecorder = new MediaStreamRecorder(stream);
    mediaRecorder.mimeType = 'video/webm';
    mediaRecorder.ondataavailable = function (blob) {
        // POST/PUT "Blob" using FormData/XHR2
        var blobURL = URL.createObjectURL(blob);
        document.write('<a href="' + blobURL + '">' + blobURL + '</a>');
    };
    mediaRecorder.start(3000);
}

function onMediaError(e) {
    console.error('media error', e);
}
</script>

Record audio/wav

<script src="https://cdn.webrtc-experiment.com/MediaStreamRecorder.js"> </script>
<script>
var mediaConstraints = {
    audio: true
};

navigator.getUserMedia(mediaConstraints, onMediaSuccess, onMediaError);

function onMediaSuccess(stream) {
    var mediaRecorder = new MediaStreamRecorder(stream);
    mediaRecorder.mimeType = 'audio/wav'; // check this line for audio/wav
    mediaRecorder.ondataavailable = function (blob) {
        // POST/PUT "Blob" using FormData/XHR2
        var blobURL = URL.createObjectURL(blob);
        document.write('<a href="' + blobURL + '">' + blobURL + '</a>');
    };
    mediaRecorder.start(3000);
}

function onMediaError(e) {
    console.error('media error', e);
}
</script>

How to manually stop recordings?

mediaRecorder.stop();

How to pause recordings?

mediaRecorder.pause();

How to resume recordings?

mediaRecorder.resume();

How to save recordings?

// invoke save-as dialog for all recorded blobs
mediaRecorder.save();

// or pass external blob/file
mediaRecorder.save(YourExternalBlob, 'FileName.webm');

How to upload recorded files using PHP?

PHP code:

<?php
foreach(array('video', 'audio') as $type) {
    if (isset($_FILES["${type}-blob"])) {
        
		$fileName = $_POST["${type}-filename"];
        $uploadDirectory = "uploads/$fileName";
        
        if (!move_uploaded_file($_FILES["${type}-blob"]["tmp_name"], $uploadDirectory)) {
            echo("problem moving uploaded file");
        }
		
		echo($uploadDirectory);
    }
}
?>

JavaScript Code:

var fileType = 'video'; // or "audio"
var fileName = 'ABCDEF.webm';  // or "wav" or "ogg"

var formData = new FormData();
formData.append(fileType + '-filename', fileName);
formData.append(fileType + '-blob', blob);

xhr('save.php', formData, function (fileURL) {
    window.open(fileURL);
});

function xhr(url, data, callback) {
    var request = new XMLHttpRequest();
    request.onreadystatechange = function () {
        if (request.readyState == 4 && request.status == 200) {
            callback(location.href + request.responseText);
        }
    };
    request.open('POST', url);
    request.send(data);
}

API Documentation

recorderType

You can force StereoAudioRecorder or WhammyRecorder or similar recorders on Firefox or Edge; even on Chrome and Opera.

All browsers will be using your specified recorder:

// force WebAudio API on all browsers
// it allows you record remote audio-streams in Firefox
// it also works in Microsoft Edge
mediaRecorder.recorderType = StereoAudioRecorder;

// force webp based webm encoder on all browsers
mediaRecorder.recorderType = WhammyRecorder;

// force MediaRecorder API on all browsers
// Chrome Canary/Dev already implemented MediaRecorder API however it is still behind a flag.
// so this property allows you force MediaRecorder in Chrome.
mediaRecorder.recorderType = MediaRecorderWrapper;

// force GifRecorder in all browsers. Both WhammyRecorder and MediaRecorder API will be ignored.
mediaRecorder.recorderType = GifRecorder;

audioChannels

To choose between Stereo or Mono audio.

It is an integer value that accepts either 1 or 2. "1" means record only left-channel and skip right-one. The default value is "2".

mediaRecorder.audioChannels = 1;

Note: It requires following recorderType:

mediaRecorder.recorderType = StereoAudioRecorder;

bufferSize

You can set following audio-bufferSize values: 0, 256, 512, 1024, 2048, 4096, 8192, and 16384. "0" means: let chrome decide the device's default bufferSize. Default value is "2048".

mediaRecorder.bufferSize = 0;

sampleRate

Default "sampleRate" value is "44100". Currently you can't modify sample-rate in windows that's why this property isn't yet exposed to public API.

It accepts values only in range: 22050 to 96000

// set sampleRate for NON-windows systems
mediaRecorder.sampleRate = 96000;

video

It is recommended to pass your HTMLVideoElement to get most accurate result.

videoRecorder.video = yourHTMLVideoElement;
videoRecorder.onStartedDrawingNonBlankFrames = function() {
    // record audio here to fix sync issues
    // Note: MultiStreamRecorder auto handles audio sync issues.
    videoRecorder.clearOldRecordedFrames(); // clear all blank frames
    audioRecorder.start(interval);
};

stop

This method allows you stop recording.

mediaRecorder.stop();

pause

This method allows you pause recording.

mediaRecorder.pause();

resume

This method allows you resume recording.

mediaRecorder.resume();

save

This method allows you save recording to disk (via save-as dialog).

// invoke save-as dialog for all recorded blobs
mediaRecorder.save();

// or pass external blob/file
mediaRecorder.save(YourExternalBlob, 'FileName.webm');

canvas

Using this property, you can pass video resolutions:

mediaRecorder.canvas = {
    width: 1280,
    height: 720
};

videoWidth and videoHeight

You can stretch video to specific width/height:

mediaRecorder.videoWidth  = 1280;
mediaRecorder.videoHeight = 720;

clearOldRecordedFrames

This method allows you clear current video-frames. You can use it to remove blank-frames.

videoRecorder.video = yourHTMLVideoElement;
videoRecorder.onStartedDrawingNonBlankFrames = function() {
    videoRecorder.clearOldRecordedFrames(); // clear all blank frames
    audioRecorder.start(interval);
};

stop

This method allows you stop entire recording process.

mediaRecorder.stop();

start

This method takes "interval" as the only argument and it starts recording process:

mediaRecorder.start(5 * 1000); // it takes milliseconds

ondataavailable

This event is fired according to your interval and "stop" method.

mediaRecorder.ondataavailable = function(blob) {
    POST_to_Server(blob);
};

onstop

This event is fired when recording is stopped, either by invoking "stop" method or in case of any unexpected error:

mediaRecorder.onstop = function() {
    // recording has been stopped.
};

mimeType

This property allows you set output media type:

// video:
videoRecorder.mimeType = 'video/webm';
videoRecorder.mimeType = 'video/mp4';

// audio:
audioRecorder.mimeType = 'audio/webm'; // MediaRecorderWrapper
audioRecorder.mimeType = 'audio/ogg'; // MediaRecorderWrapper
audioRecorder.mimeType = 'audio/wav'; // StereoAudioRecorder
audioRecorder.mimeType = 'audio/pcm'; // StereoAudioRecorder

// gif:
gifRecorder.mimeType = 'image/gif'; // GifRecorder

bitsPerSecond

// currently supported only in Firefox
videoRecorder.bitsPerSecond = 12800;

quality

// only chrome---whilst using WhammyRecorder
videoRecorder.quality = .8;

speed

// only chrome---whilst using WhammyRecorder
videoRecorder.speed = 100;

Browser Support

Browser	Support
Firefox	Stable / Aurora / Nightly
Google Chrome	Stable / Canary / Beta / Dev
Opera	Stable / NEXT
Android	Chrome / Firefox / Opera
Microsoft Edge	Normal Build

Contributors

1. Muaz Khan
2. neizerth
3. andersaloof

License

MediaStreamRecorder.js library is released under MIT licence.