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+---
+title: SourceBuffer
+slug: Web/API/SourceBuffer
+tags:
+  - API
+  - Audio
+  - Experimental
+  - Interface
+  - MSE
+  - Media Source Extensions
+  - NeedsTranslation
+  - Reference
+  - SourceBuffer
+  - TopicStub
+  - Video
+translation_of: Web/API/SourceBuffer
+---
+<p>{{APIRef("Media Source Extensions")}}</p>
+
+<p>The <strong><code>SourceBuffer</code></strong> interface represents a chunk of media to be passed into an {{domxref("HTMLMediaElement")}} and played, via a {{domxref("MediaSource")}} object. This can be made up of one or several media segments.</p>
+
+<p>{{InheritanceDiagram}}</p>
+
+<h2 id="Properties">Properties</h2>
+
+<dl>
+ <dt>{{domxref("SourceBuffer.appendWindowEnd")}}</dt>
+ <dd>Controls the timestamp for the end of the append window.</dd>
+ <dt>{{domxref("SourceBuffer.appendWindowStart")}}</dt>
+ <dd>Controls the timestamp for the start of the <a href="https://w3c.github.io/media-source/#append-window">append window</a>. This is a timestamp range that can be used to filter what media data is appended to the <code>SourceBuffer</code>. Coded media frames with timestamps within this range will be appended, whereas those outside the range will be filtered out.</dd>
+ <dt>{{domxref("SourceBuffer.audioTracks")}} {{readonlyInline}}</dt>
+ <dd>A list of the audio tracks currently contained inside the <code>SourceBuffer</code>.</dd>
+ <dt>{{domxref("SourceBuffer.buffered")}} {{readonlyInline}}</dt>
+ <dd>Returns the time ranges that are currently buffered in the <code>SourceBuffer</code>.</dd>
+ <dt>{{domxref("SourceBuffer.mode")}}</dt>
+ <dd>Controls how the order of media segments in the <code>SourceBuffer</code> is handled, in terms of whether they can be appended in any order, or they have to be kept in a strict sequence.</dd>
+ <dt>{{domxref("SourceBuffer.textTracks")}} {{readonlyInline}}</dt>
+ <dd>A list of the text tracks currently contained inside the <code>SourceBuffer</code>.</dd>
+ <dt>{{domxref("SourceBuffer.timestampOffset")}}</dt>
+ <dd>Controls the offset applied to timestamps inside media segments that are subsequently appended to the <code>SourceBuffer</code>.</dd>
+ <dt>{{domxref("SourceBuffer.trackDefaults")}}</dt>
+ <dd>Specifies the default values to use if kind, label, and/or language information is not available in the <a href="https://w3c.github.io/media-source/#init-segment">initialization segment</a> of the media to be appended to the <code>SourceBuffer</code>.</dd>
+ <dt>{{domxref("SourceBuffer.updating")}} {{readonlyInline}}</dt>
+ <dd>A boolean indicating whether the <code>SourceBuffer</code> is currently being updated — i.e. whether an {{domxref("SourceBuffer.appendBuffer()")}}, {{domxref("SourceBuffer.appendStream()")}}, or {{domxref("SourceBuffer.remove()")}} operation is currently in progress.</dd>
+ <dt>{{domxref("SourceBuffer.videoTracks")}} {{readonlyInline}}</dt>
+ <dd>A list of the video tracks currently contained inside the <code>SourceBuffer</code>.</dd>
+</dl>
+
+<h3 id="Event_handlers">Event handlers</h3>
+
+<dl>
+ <dt>{{domxref("SourceBuffer.onabort")}}</dt>
+ <dd>Fired whenever {{domxref("SourceBuffer.appendBuffer()")}} or {{domxref("SourceBuffer.appendStream()")}} is ended by a call to {{domxref("SourceBuffer.abort()")}}. {{domxref("SourceBuffer.updating")}} changes from <code>true</code> to <code>false</code>.</dd>
+ <dt>{{domxref("SourceBuffer.onerror")}}</dt>
+ <dd>Fired whenever an error occurs during {{domxref("SourceBuffer.appendBuffer()")}} or {{domxref("SourceBuffer.appendStream()")}}. {{domxref("SourceBuffer.updating")}} changes from <code>true</code> to <code>false</code>.</dd>
+ <dt>{{domxref("SourceBuffer.onupdate")}}</dt>
+ <dd>Fired whenever {{domxref("SourceBuffer.appendBuffer()")}} method or the {{domxref("SourceBuffer.remove()")}} completes. {{domxref("SourceBuffer.updating")}} changes from <code>true</code> to <code>false</code>. This event is fired before <code>onupdateend</code>.</dd>
+ <dt>{{domxref("SourceBuffer.onupdateend")}}</dt>
+ <dd>Fired whenever {{domxref("SourceBuffer.appendBuffer()")}} method or the {{domxref("SourceBuffer.remove()")}} has ended. This event is fired after <code>onupdate</code>.</dd>
+ <dt>{{domxref("SourceBuffer.onupdatestart")}}</dt>
+ <dd>Fired whenever the value of {{domxref("SourceBuffer.updating")}} transitions from <code>false</code> to <code>true</code>.</dd>
+</dl>
+
+<h2 id="Methods">Methods</h2>
+
+<p><em>Inherits methods from its parent interface, {{domxref("EventTarget")}}.</em></p>
+
+<dl>
+ <dt>{{domxref("SourceBuffer.abort()")}}</dt>
+ <dd>Aborts the current segment and resets the segment parser.</dd>
+ <dt>{{domxref("SourceBuffer.appendBuffer()")}}</dt>
+ <dd>Appends media segment data from an {{domxref("ArrayBuffer")}} or {{domxref("ArrayBufferView")}} object to the <code>SourceBuffer</code>.</dd>
+ <dt>{{domxref("SourceBuffer.appendBufferAsync()")}} {{experimental_inline}}</dt>
+ <dd>Starts the process of asynchronously appending the specified buffer to the <code>SourceBuffer</code>. Returns a {{jsxref("Promise")}} which is fulfilled once the buffer has been appended.</dd>
+ <dt>{{domxref("SourceBuffer.appendStream()")}}</dt>
+ <dd>Appends media segment data from a <code>ReadableStream</code> object to the <code>SourceBuffer</code>.</dd>
+ <dt>{{domxref("SourceBuffer.changeType()")}}</dt>
+ <dd>Changes the {{Glossary("MIME type")}} that future calls to {{domxref("SourceBuffer.appendBuffer", "appendBuffer()")}} will expect the new data to conform to.</dd>
+ <dt>{{domxref("SourceBuffer.remove()")}}</dt>
+ <dd>Removes media segments within a specific time range from the <code>SourceBuffer</code>.</dd>
+ <dt>{{domxref("SourceBuffer.removeAsync()")}} {{experimental_inline}}</dt>
+ <dd>Starts the process of asynchronously removing media segments in the specified range from the <code>SourceBuffer</code>. Returns a {{jsxref("Promise")}} which is fulfilled once all matching segments have been removed.</dd>
+</dl>
+
+<h2 id="Examples">Examples</h2>
+
+<p>The following simple example loads a video chunk by chunk as fast as possible, playing it as soon as it can. This example was written by Nick Desaulniers and can be <a href="http://nickdesaulniers.github.io/netfix/demo/bufferAll.html">viewed live here</a> (you can also <a href="https://github.com/nickdesaulniers/netfix/blob/gh-pages/demo/bufferAll.html">download the source</a> for further investigation.)</p>
+
+<pre class="brush: js">var video = document.querySelector('video');
+
+var assetURL = 'frag_bunny.mp4';
+// Need to be specific for Blink regarding codecs
+// ./mp4info frag_bunny.mp4 | grep Codec
+var mimeCodec = 'video/mp4; codecs="avc1.42E01E, mp4a.40.2"';
+
+if ('MediaSource' in window &amp;&amp; MediaSource.isTypeSupported(mimeCodec)) {
+  var mediaSource = new MediaSource;
+  //console.log(mediaSource.readyState); // closed
+  video.src = URL.createObjectURL(mediaSource);
+  mediaSource.addEventListener('sourceopen', sourceOpen);
+} else {
+  console.error('Unsupported MIME type or codec: ', mimeCodec);
+}
+
+function sourceOpen (_) {
+  //console.log(this.readyState); // open
+  var mediaSource = this;
+  var sourceBuffer = mediaSource.addSourceBuffer(mimeCodec);
+  fetchAB(assetURL, function (buf) {
+    sourceBuffer.addEventListener('updateend', function (_) {
+      mediaSource.endOfStream();
+      video.play();
+      //console.log(mediaSource.readyState); // ended
+    });
+    sourceBuffer.appendBuffer(buf);
+  });
+}
+
+function fetchAB (url, cb) {
+  console.log(url);
+  var xhr = new XMLHttpRequest;
+  xhr.open('get', url);
+  xhr.responseType = 'arraybuffer';
+  xhr.onload = function () {
+    cb(xhr.response);
+  };
+  xhr.send();
+}</pre>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Media Source Extensions', '#sourcebuffer', 'SourceBuffer')}}</td>
+   <td>{{Spec2('Media Source Extensions')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div>
+
+
+<p>{{Compat("api.SourceBuffer")}}</p>
+</div>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{domxref("MediaSource")}}</li>
+ <li>{{domxref("SourceBufferList")}}</li>
+</ul>