Web/API/VideoTrackList

From Get docs


The VideoTrackList interface is used to represent a list of the video tracks contained within a <video> element, with each track represented by a separate VideoTrack object in the list.

Retrieve an instance of this object with HTMLMediaElement.videoTracks. The individual tracks can be accessed using array syntax or functions such as forEach() for example.

Properties

This interface also inherits properties from its parent interface, EventTarget.

length Read only
The number of tracks in the list.
selectedIndex Read only
The index of the currently selected track, if any, or −1 otherwise.

Event handlers

onaddtrack
An event handler to be called when the addtrack event is fired, indicating that a new video track has been added to the media element.
onchange
An event handler to be called when the change event occurs — that is, when the value of the selected property for a track has changed, due to the track being made active or inactive.
onremovetrack
An event handler to call when the removetrack event is sent, indicating that a video track has been removed from the media element.

Methods

This interface also inherits methods from its parent interface, EventTarget.

getTrackById()
Returns the VideoTrack found within the VideoTrackList whose id matches the specified string. If no match is found, null is returned.

Events

addtrack
Fired when a new video track has been added to the media element. Also available via the onaddtrack property.
change
Fired when a video track has been made active or inactive. Also available via the onchange property.
removetrack
Fired when a new video track has been removed from the media element. Also available via the onremovetrack property.

Usage notes

In addition to being able to obtain direct access to the video tracks present on a media element, VideoTrackList lets you set event handlers on the addtrack and removetrack events, so that you can detect when tracks are added to or removed from the media element's stream. See onaddtrack and onremovetrack for details and examples.

Examples

Getting a media element's video track list

To get a media element's VideoTrackList, use its videoTracks property.

var videoTracks = document.querySelector("video").videoTracks;

Monitoring track count changes

In this example, we have an app that displays information about the number of channels available. To keep it up to date, handlers for the addtrack and removetrack events are set up.

videoTracks.onaddtrack = updateTrackCount;
videoTracks.onremovetrack = updateTrackCount;

function updateTrackCount(event) {
  trackCount = videoTracks.length;
  drawTrackCountIndicator(trackCount);
}

Specifications

Specification Status Comment
HTML Living StandardThe definition of 'VideoTrackList' in that specification. Living Standard

Browser compatibility

Update compatibility data on GitHub

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
VideoTrackList

Chrome Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Edge Full support 79

Disabled'

Full support 79

Disabled'

Disabled' From version 79: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). No support 12 — 79


Firefox Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

IE

Full support 10

Opera Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari

Full support 6.1

WebView Android

No support No

Chrome Android Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Firefox Android Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

Opera Android Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari iOS

Full support 7

Samsung Internet Android

No support No

addtrack event

Chrome Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Edge Full support 79

Disabled'

Full support 79

Disabled'

Disabled' From version 79: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). No support 12 — 79


Firefox Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

IE

Full support 10

Opera Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari

Full support 6.1

WebView Android

No support No

Chrome Android Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Firefox Android Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

Opera Android Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari iOS

Full support 7

Samsung Internet Android

No support No

change event

Chrome Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Edge Full support 79

Disabled'

Full support 79

Disabled'

Disabled' From version 79: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). No support 12 — 79


Firefox Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

IE

Full support 10

Opera Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari

Full support 6.1

WebView Android

No support No

Chrome Android Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Firefox Android Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

Opera Android Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari iOS

Full support 7

Samsung Internet Android

No support No

getTrackById

Chrome Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Edge Full support 79

Disabled'

Full support 79

Disabled'

Disabled' From version 79: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). No support 12 — 79


Firefox Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

IE

Full support 10

Opera Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari

Full support 6.1

WebView Android

No support No

Chrome Android Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Firefox Android Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

Opera Android Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari iOS

Full support 7

Samsung Internet Android

No support No

length

Chrome Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Edge Full support 79

Disabled'

Full support 79

Disabled'

Disabled' From version 79: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). No support 12 — 79


Firefox Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

IE

Full support 10

Opera Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari

Full support 6.1

WebView Android

No support No

Chrome Android Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Firefox Android Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

Opera Android Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari iOS

Full support 7

Samsung Internet Android

No support No

onaddtrack

Chrome Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Edge Full support 79

Disabled'

Full support 79

Disabled'

Disabled' From version 79: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). No support 12 — 79


Firefox Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

IE

Full support 10

Opera Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari

Full support 6.1

WebView Android

No support No

Chrome Android Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Firefox Android Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

Opera Android Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari iOS

Full support 7

Samsung Internet Android

No support No

onchange

Chrome Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Edge Full support 79

Disabled'

Full support 79

Disabled'

Disabled' From version 79: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). No support 12 — 79


Firefox Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

IE

Full support 10

Opera Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari

Full support 6.1

WebView Android

No support No

Chrome Android Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Firefox Android Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

Opera Android Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari iOS

Full support 7

Samsung Internet Android

No support No

onremovetrack

Chrome Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Edge Full support 79

Disabled'

Full support 79

Disabled'

Disabled' From version 79: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). No support 12 — 79


Firefox Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

IE

Full support 10

Opera Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari

Full support 6.1

WebView Android

No support No

Chrome Android Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Firefox Android Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

Opera Android Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari iOS

Full support 7

Samsung Internet Android

No support No

removetrack event

Chrome Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Edge Full support 79

Disabled'

Full support 79

Disabled'

Disabled' From version 79: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). No support 12 — 79


Firefox Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

IE

Full support 10

Opera Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari

Full support 6.1

WebView Android

No support No

Chrome Android Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Firefox Android Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

Opera Android Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari iOS

Full support 7

Samsung Internet Android

No support No

selectedIndex

Chrome Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Edge Full support 79

Disabled'

Full support 79

Disabled'

Disabled' From version 79: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). No support 12 — 79


Firefox Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

IE

Full support 10

Opera Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari

Full support 6.1

WebView Android

No support No

Chrome Android Full support 37

Disabled'

Full support 37

Disabled'

Disabled' From version 37: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled). To change preferences in Chrome, visit chrome://flags.

Firefox Android Full support 33

Disabled'

Full support 33

Disabled'

Disabled' From version 33: this feature is behind the media.track.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

Opera Android Full support 24

Disabled'

Full support 24

Disabled'

Disabled' From version 24: this feature is behind the enable-experimental-web-platform-features preference (needs to be set to enabled).

Safari iOS

Full support 7

Samsung Internet Android

No support No

Legend

Full support  
Full support
No support  
No support
User must explicitly enable this feature.'
User must explicitly enable this feature.