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.
Errors
The following errors may be thrown when setting a new value for this property.
| Error | 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 | Status | Comment |
|---|---|---|
| Media Source Extensions The definition of 'duration' in that specification. |
Recommendation | Initial definition. |
Browser compatibility
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 31 23 — 31 -webkit- | 12 | 42 | 113 | 15 | 8 |
| Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | Opera Android | iOS Safari | Samsung Internet |
|---|---|---|---|---|---|---|---|
| Basic support | 33 | 33 | Yes | 41 | 30 | No | Yes |
1. Limited support to a whitelist of sites, for example YouTube, Netflix, and other popular streaming sites. The whitelist was removed when Media Source Extensions was enabled by default in Firefox 42.
2. From version 25 until version 42 (exclusive): this feature is behind the media.mediasource.enabled preference. To change preferences in Firefox, visit about:config.
3. Only works on Windows 8+.