Cross-Browser recording of audio/video media streams; targets WebRTC/getUserMedia/WebAudio/etc.
npm install msr  
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.
| 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
You can install scripts using NPM:
``javascript
npm install msr
Now try
and open https://localhost:9001/Test on NPM
javascript
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
:`
cd node_modules
cd msr
node npm-test.js
Then link single/standalone "MediaStreamRecorder.js" file:
html
`Record audio+video
html
`Record audio/wav
html
`How to manually stop recordings?
javascript
mediaRecorder.stop();
`How to pause recordings?
javascript
mediaRecorder.pause();
`How to resume recordings?
javascript
mediaRecorder.resume();
`How to save recordings?
javascript
// 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:
javascript
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
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:
javascript
// 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;
`> 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".
javascript
mediaRecorder.audioChannels = 1;
`Note: It requires following recorderType:
javascript
mediaRecorder.recorderType = StereoAudioRecorder;
`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".
javascript
mediaRecorder.bufferSize = 0;
`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
javascript
// set sampleRate for NON-windows systems
mediaRecorder.sampleRate = 96000;
`It is recommended to pass your HTMLVideoElement to get most accurate result.
javascript
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);
};
`This method allows you stop recording.
javascript
mediaRecorder.stop();
`This method allows you pause recording.
javascript
mediaRecorder.pause();
`This method allows you resume recording.
javascript
mediaRecorder.resume();
`This method allows you save recording to disk (via save-as dialog).
javascript
// 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:
javascript
mediaRecorder.canvas = {
width: 1280,
height: 720
};
`videoWidth and videoHeight
You can stretch video to specific width/height:
javascript
mediaRecorder.videoWidth = 1280;
mediaRecorder.videoHeight = 720;
`clearOldRecordedFrames
This method allows you clear current video-frames. You can use it to remove blank-frames.
javascript
videoRecorder.video = yourHTMLVideoElement;
videoRecorder.onStartedDrawingNonBlankFrames = function() {
videoRecorder.clearOldRecordedFrames(); // clear all blank frames
audioRecorder.start(interval);
};
`stop
This method allows you stop entire recording process.
javascript
mediaRecorder.stop();
`start
This method takes "interval" as the only argument and it starts recording process:
javascript
mediaRecorder.start(5 * 1000); // it takes milliseconds
`ondataavailable
This event is fired according to your interval and "stop" method.
javascript
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:
javascript
mediaRecorder.onstop = function() {
// recording has been stopped.
};
`mimeType
This property allows you set output media type:
javascript
// 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
javascript
// currently supported only in Firefox
videoRecorder.bitsPerSecond = 12800;
`quality
javascript
// only chrome---whilst using WhammyRecorder
videoRecorder.quality = .8;
`speed
javascript
// only chrome---whilst using WhammyRecorder
videoRecorder.speed = 100;
``| Browser | Support |
| ------------- |-------------|
| Firefox | Stable / Aurora / Nightly |
| Google Chrome | Stable / Canary / Beta / Dev |
| Opera | Stable / NEXT |
| Android | Chrome / Firefox / Opera |
| Microsoft Edge | Normal Build |
1. Muaz Khan
2. neizerth
3. andersaloof
MediaStreamRecorder.js library is released under MIT licence.