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The MediaRecorder.mimeType read-only property returns the MIME type that is being used as the recording container when it was created. This is the file format of the file that would result from writing all of the recorded data to disk. Keep in mind, of course, that the file format and the codecs associated with the individual tracks are different things entirely; writing tracks that work just fine in a WebM video into an MP4 wrapper may not result in a file that plays everywhere you want  it to.


var mimeType = MediaRecorder.mimeType


The MIME type being used as the container format for the recorded media, in DOMString form.



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

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

    .then(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'
    .catch(function(error) {


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

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
mimeTypeChrome Full support 47
Full support 47
Notes Prior to Chrome 49, only video is supported, not audio.
Edge ? Firefox Full support 25IE ? Opera Full support 36Safari ? WebView Android Full support 49Chrome Android Full support 49Edge Mobile ? Firefox Android Full support 25Opera Android Full support 36Safari iOS ? Samsung Internet Android No support No


Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
See implementation notes.
See implementation notes.

See also

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