Web/API/SourceBuffer/trackDefaults

ObsoleteThis feature is obsolete.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 trackDefaults property of the SourceBuffer interface specifies the default values to use if kind, label, and/or language information is not available in the initialization segment of the media to be appended to the SourceBuffer.

Syntax

var myTrackDefaults = sourceBuffer.trackDefaults;

sourceBuffer.trackDefaults = myTrackDefaultList;

Value

A TrackDefaultList object.

Exceptions

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

Exception	Explanation
`InvalidStateError`	One or more of the `SourceBuffer` objects in `MediaSource.sourceBuffers` are being updated (i.e. their `SourceBuffer.updating` property is currently `true`), or this `SourceBuffer` has been removed from the `MediaSource`.

Example

TBD

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
`trackDefaults` Deprecated'Non-standard'	Chrome ?	Edge ?	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

No support: No support
Compatibility unknown: Compatibility unknown
Non-standard. Expect poor cross-browser support.': Non-standard. Expect poor cross-browser support.
Deprecated. Not for use in new websites.': Deprecated. Not for use in new websites.