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SourceBuffer.appendWindowStart

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.

Errors

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

Error 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 Status Comment
Media Source Extensions
The definition of 'appendWindowStart' in that specification.		 Recommendation Initial definition.

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Basic support 31
31
23 — 31
Prefixed
Prefixed Requires the vendor prefix: -webkit-
 12 42
42
25 — 42
Disabled
Limited support to a whitelist of sites, for example YouTube, Netflix, and other popular streaming sites. The whitelist was removed when Media Source Extensions was enabled by default in Firefox 42.
Disabled From version 25 until version 42 (exclusive): this feature is behind the media.mediasource.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
 11
11
Only works on Windows 8+.
 15 8
Mobile
Android webview Chrome for Android Edge Mobile Firefox for Android Opera for Android iOS Safari Samsung Internet
Basic support 4.4.3 ? Yes No 30 No ?

See also

Edit this page on MDN

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https://developer.mozilla.org/en-US/docs/Web/API/SourceBuffer/appendWindowStart