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

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 47[2] 25.0 (25.0) No support No support No support
Feature Android Android Webview Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile Chrome for Android
Basic support No support No support 25.0 (25.0) 1.3[1] No support No support No support No support

[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

Document Tags and Contributors

 Contributors to this page: Sheppy, jpmedley, Sebastianz, teoli, chrisdavidmills
 Last updated by: Sheppy,