Web/API/SourceBuffer/appendBufferAsync

Non-standard This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

This is an experimental technologyCheck the Browser compatibility table carefully before using this in production.

The appendBufferAsync() method of the SourceBuffer interface begins the process of asynchronously appending media segment data from an ArrayBuffer or ArrayBufferView object to the SourceBuffer. It returns a Promise which is fulfilled once the buffer has been appended.

Syntax

appendPromise = sourceBuffer.appendBufferAsync(source);

Parameters

source: A BufferSource (that is, either an ArrayBufferView or ArrayBuffer) which contains the media segment data you want to add to the SourceBuffer.

Return value

A Promise which is fulfilled when the buffer has been added successfully to the SourceBuffer, or null if the request could not be initiated.

Example

This simplified example async function, fillSourceBuffer(), takes as input parameters BufferSource, buffer, and a SourceBuffer to which to append the source media from the buffer.

async function fillSourceBuffer(buffer, msBuffer) {
  try {
    while(true) {
      await msBuffer.appendBufferAsync(buffer);
    }
  } catch(e) {
    handleException(e);
  }
}

Specifications

Not currently part of any specification. This is being experimented with under the auspices of the Web Platform Incubator Community Group (WICG).

Specification	Status	Comment
Media Source Extensions	Recommendation	Initial definition; does not include this method.

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
`appendBufferAsync`	Chrome No support No	Edge No support No	Firefox Full support 62 Disabled' Full support 62 Disabled' Disabled' From version 62: this feature is behind the `media.mediasource.experimental.enabled` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	IE No support No	Opera No support No	Safari No support No	WebView Android No support No	Chrome Android Full support Yes	Firefox Android No support No	Opera Android No support No	Safari iOS No support No	Samsung Internet Android Full support Yes

Legend

Full support: Full support
No support: No support
User must explicitly enable this feature.': User must explicitly enable this feature.