SourceBuffer.appendWindowStart

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Draft: This page is not complete.

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 wthin 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.

Syntax

var myAppendWindowStart = sourceBuffer.appendWindowStart;

sourceBuffer.appendWindowStart = 2.0;

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.

Exception	Explanation
`InvalidAccessError`	An attempt was made to set the value to less than 0, or a value greater than or equal to `SourceBuffer.appendWindowEnd`.
`InvalidStateError`	This `SourceBuffer` object is being updated (i.e. its `SourceBuffer.updating` property is currently `true`), or this `SourceBuffer` has been removed from the `MediaSource`.

Example

TBD

Specifications

Specification
Media Source Extensions™ # dom-sourcebuffer-appendwindowstart

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`appendWindowStart`	23	12	42	11 Only works on Windows 8+.	15	8	4.4.3	33	42	14	13 Exposed in Mobile Safari on iPad but not on iPhone.	3.0