MediaSource.duration

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The duration property of the MediaSource interface gets and sets the duration of the current media being presented.

Syntax

mediaSource.duration = 5.5; // 5.5 seconds

var myDuration = mediaSource.duration;

Value

A double. A value in seconds is expected.

Exceptions

The following exceptions may be thrown when setting a new value for this property.

Exception	Explanation
`InvalidAccessError`	An attempt was made to set a duration value that was negative, or `NaN`.
`InvalidStateError`	`MediaSource.readyState` is not equal to `open`, or one or more of the `SourceBuffer` objects in `MediaSource.sourceBuffers` are being updated (i.e. their `SourceBuffer.updating` property is `true`.)

Example

The following snippet is based on a simple example written by Nick Desaulniers (view the full demo live, or download the source for further investigation.)

function sourceOpen (_) {
  //console.log(this.readyState); // open
  var mediaSource = this;
  var sourceBuffer = mediaSource.addSourceBuffer(mimeCodec);
  fetchAB(assetURL, function (buf) {
    sourceBuffer.addEventListener('updateend', function (_) {
      mediaSource.endOfStream();
      mediaSource.duration = 120;
      video.play();
      //console.log(mediaSource.readyState); // ended
    });
    sourceBuffer.appendBuffer(buf);
  });
};

...

Specifications

Specification
Media Source Extensions™ # dom-mediasource-duration

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`duration`	23	12	42	11 Only works on Windows 8+.	15	8	4.4.3	25	41	14	13 Exposed in Mobile Safari on iPad but not on iPhone.	1.5