The MediaRecorder.mimeType read-only property returns the mime type that was selected as the recording container when it was created.


var mimeType = MediaRecorder.mimeType


A DOMString.



navigator.getUserMedia = (navigator.getUserMedia ||
                          navigator.mozGetUserMedia ||
                          navigator.msGetUserMedia ||

if (navigator.getUserMedia) {
  console.log('getUserMedia supported.');

  var constraints = { audio: true, video: true };
  var chunks = [];

  var onSuccess = function(stream) {
    var options = {
      audioBitsPerSecond : 128000,
      videoBitsPerSecond : 2500000,
      mimeType : 'video/mp4'
    var mediaRecorder = new MediaRecorder(stream,options);
    m = mediaRecorder;

    m.mimeType; // would return 'video/mp4'



Specification Status Comment
MediaStream Recording
The definition of 'MediaRecorder.mimeType' 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) 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: j1mr10rd4n, jpmedley, chrisdavidmills
 Last updated by: j1mr10rd4n,