The read-only property returns the stream that was passed into the MediaRecorder() constructor when the MediaRecorder was created.


var stream =


The MediaStream passed into the MediaRecorder() constructor when the MediaRecorder was originally created.


if (navigator.getUserMedia) {
   console.log('getUserMedia supported.');
   navigator.getUserMedia (
      // constraints - only audio needed for this app
         audio: true

      // Success callback
      function(stream) {
           var mediaRecorder = new MediaRecorder(stream);

           var myStream =;



Specification Status Comment
MediaStream Recording
The definition of '' in that specification.
Working Draft Initial definition

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 47[2] 25.0 (25.0) Not supported Not supported Not supported
Feature Android Android Webview Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile Chrome for Android
Basic support Not supported Not supported 25.0 (25.0) 1.3[1] Not supported Not supported Not supported Not supported

[1] The intial Firefox OS implementation only supported audio recording.

[2] To try this feature on Chrome, enable Experimental Web Platform features from chrome://flags . Currently only video is supported, not audio.

See also


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

API Media Recorder API MediaRecorder Property Reference stream