Web/API/TrackDefault

ObsoleteThis feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

The TrackDefault interface provides a SourceBuffer with kind, label, and language information for tracks that do not contain this information in the initialization segments of a media chunk.

A TrackDefault object is provided to a SourceBuffer object by setting its SourceBuffer.trackDefaults property.

Constructor

TrackDefault()

Constructs and returns a new TrackDefault object.

Properties

TrackDefault.type Read only

Returns the type of track that this SourceBuffer's media segment data relates to (i.e. audio, video, or text track.)

TrackDefault.byteStreamTrackID Read only

Returns the ID of the specific track that the SourceBuffer should apply to.

TrackDefault.language Read only

Returns the default language to use when an initialization segment does not contain language information for a new track.

TrackDefault.label Read only

Returns the default label to use when an initialization segment does not contain label information for a new track.

TrackDefault.kinds Read only

Returns the default kinds used when an initialization segment does not contain kind information for a new track.

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

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
TrackDefault Experimental'Non-standard'	Chrome ?	Edge Full support ≤18	Firefox No support No	IE ?	Opera ?	Safari ?	WebView Android ?	Chrome Android ?	Firefox Android No support No	Opera Android ?	Safari iOS No support No	Samsung Internet Android ?
TrackDefault() constructor Experimental'Non-standard'	Chrome ?	Edge Full support ≤18	Firefox No support No	IE ?	Opera ?	Safari ?	WebView Android ?	Chrome Android ?	Firefox Android No support No	Opera Android ?	Safari iOS No support No	Samsung Internet Android ?
byteStreamTrackID Experimental'Non-standard'	Chrome ?	Edge Full support ≤18	Firefox No support No	IE ?	Opera ?	Safari ?	WebView Android ?	Chrome Android ?	Firefox Android No support No	Opera Android ?	Safari iOS No support No	Samsung Internet Android ?
kinds Experimental'Non-standard'	Chrome ?	Edge Full support ≤18	Firefox No support No	IE ?	Opera ?	Safari ?	WebView Android ?	Chrome Android ?	Firefox Android No support No	Opera Android ?	Safari iOS No support No	Samsung Internet Android ?
label Experimental'Non-standard'	Chrome ?	Edge Full support ≤18	Firefox No support No	IE ?	Opera ?	Safari ?	WebView Android ?	Chrome Android ?	Firefox Android No support No	Opera Android ?	Safari iOS No support No	Samsung Internet Android ?
language Experimental'Non-standard'	Chrome ?	Edge Full support ≤18	Firefox No support No	IE ?	Opera ?	Safari ?	WebView Android ?	Chrome Android ?	Firefox Android No support No	Opera Android ?	Safari iOS No support No	Samsung Internet Android ?
type Experimental'Non-standard'	Chrome ?	Edge Full support ≤18	Firefox No support No	IE ?	Opera ?	Safari ?	WebView Android ?	Chrome Android ?	Firefox Android No support No	Opera Android ?	Safari iOS No support No	Samsung Internet Android ?

Legend

Full support  

Full support

No support  

No support

Compatibility unknown  

Compatibility unknown

Experimental. Expect behavior to change in the future.'

Experimental. Expect behavior to change in the future.

Non-standard. Expect poor cross-browser support.'

Non-standard. Expect poor cross-browser support.

See also

• MediaSource
• SourceBuffer
• TrackDefaultList

TrackDefault by Mozilla Contributors is licensed under CC-BY-SA 2.5.