SourceBuffer: appendWindowStart property

Limited availability

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

Note: This feature is available in Dedicated Web Workers.

The appendWindowStart property of the SourceBuffer interface controls the timestamp for the start of the append window, a timestamp range that can be used to filter what media data is appended to the SourceBuffer. Coded media frames with timestamps within this range will be appended, whereas those outside the range will be filtered out.

The default value of appendWindowStart is the presentation start time, which is the beginning time of the playable media.

Value

A double, indicating the start time of the append window, in seconds.

Exceptions

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

InvalidAccessError DOMException

Thrown if an attempt was made to set the value to less than 0 or to a value greater than or equal to SourceBuffer.appendWindowEnd.

InvalidStateError DOMException

Thrown if this SourceBuffer object is being updated (i.e. its SourceBuffer.updating property is currently true), or this SourceBuffer has been removed from the MediaSource.

Examples

TBD

Specifications

Specification
Media Source Extensions™
# dom-sourcebuffer-appendwindowstart

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
appendWindowStart
Available in workers
Experimental

Legend

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

Full support
Full support
Partial support
Partial support
No support
No support
Experimental. Expect behavior to change in the future.

See also