MediaSource: MediaSource() constructor

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

See full compatibility

Note: This feature is available in Dedicated Web Workers.

The MediaSource() constructor of the MediaSource interface constructs and returns a new MediaSource object with no associated source buffers.

Syntax

new MediaSource()

Parameters

None.

Examples

The following snippet is taken from an example written by Nick Desaulniers (view the full demo live, or download the source for further investigation).

const video = document.querySelector("video");

const assetURL = "frag_bunny.mp4";
// Need to be specific for Blink regarding codecs
// ./mp4info frag_bunny.mp4 | grep Codec
const mimeCodec = 'video/mp4; codecs="avc1.42E01E, mp4a.40.2"';

if ("MediaSource" in window && MediaSource.isTypeSupported(mimeCodec)) {
  const mediaSource = new MediaSource();
  // console.log(mediaSource.readyState); // closed
  video.src = URL.createObjectURL(mediaSource);
  mediaSource.addEventListener("sourceopen", sourceOpen);
} else {
  console.error("Unsupported MIME type or codec: ", mimeCodec);
}

// …

Specifications

Specification
Media Source Extensions™ # dom-mediasource-constructor

Browser compatibility

	desktop					mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`MediaSource()` constructor	Chrome – No support Chrome 23 – 30 (Release date: 2012-11-06) prefix prefix Implemented with the vendor prefix: WebKit Chrome – Full support Chrome 31 (Release date: 2013-11-12) footnote Full support	Edge – Full support Edge 12 (Release date: 2015-07-29) footnote Full support	Firefox – Full support Firefox 42 (Release date: 2015-11-03) footnote Full support	Opera – Full support Opera 15 (Release date: 2013-07-02) footnote Full support	Safari – Full support Safari 8 (Release date: 2014-10-16) footnote Full support	Chrome Android – Full support Chrome Android 33 (Release date: 2014-02-26) footnote Full support	Firefox for Android – Full support Firefox for Android 41 (Release date: 2015-09-22) footnote Full support	Opera Android – Full support Opera Android 14 (Release date: 2013-05-21) footnote Full support	Safari on iOS – Partial support Safari on iOS 13 (Release date: 2019-09-19) footnote Partial support footnote Exposed in Mobile Safari on iPad but not on iPhone.	Samsung Internet – Full support Samsung Internet 2 (Release date: 2014-10-17) footnote Full support	WebView Android – Full support WebView Android 4.4.3 (Release date: 2014-06-02) footnote Full support	WebView on iOS – No support WebView on iOS footnote No support

Tip: you can click/tap on a cell for more information.

Full support: Full support
Partial support: Partial support
No support: No support
: Requires a vendor prefix or different name for use.
: Has more compatibility info.