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diff --git a/files/zh-cn/web/api/mediasource/addsourcebuffer/index.html b/files/zh-cn/web/api/mediasource/addsourcebuffer/index.html
new file mode 100644
index 0000000000..3e2194c7af
--- /dev/null
+++ b/files/zh-cn/web/api/mediasource/addsourcebuffer/index.html
@@ -0,0 +1,173 @@
+---
+title: MediaSource.addSourceBuffer()
+slug: Web/API/MediaSource/addSourceBuffer
+translation_of: Web/API/MediaSource/addSourceBuffer
+---
+<div>{{APIRef("Media Source Extensions")}}{{SeeCompatTable}}</div>
+
+<p>{{domxref("MediaSource")}} 的 <code><strong>addSourceBuffer()</strong></code> 方法会根据给定的 MIME 类型创建一个新的 {{domxref("SourceBuffer")}} 对象，然后会将它追加到 <code>MediaSource 的</code> {{domxref("SourceBuffers")}} 列表中。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: js">var sourceBuffer = mediaSource.addSourceBuffer(mimeType);</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>mimeType</dt>
+ <dd>你想创建的 source buffer 的 MIME 类型。</dd>
+</dl>
+
+<h3 id="返回">返回</h3>
+
+<p>一个 {{domxref("SourceBuffer")}} 对象。</p>
+
+<h3 id="错误（_Errors_）">错误（ Errors ）</h3>
+
+<p>下面的错误可能会在调用该方法时被抛出。</p>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Error</th>
+   <th scope="col">Explanation</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td><code>InvalidAccessError</code></td>
+   <td>提交的 <code>mimeType</code> 是一个空字符串。</td>
+  </tr>
+  <tr>
+   <td><code>InvalidStateError</code></td>
+   <td>{{domxref("MediaSource.readyState")}} 的值不等于 <code>open</code>.</td>
+  </tr>
+  <tr>
+   <td><code>NotSupportedError</code></td>
+   <td>当前浏览器不支持你提交的 <code>mimeType</code> , 或者 it is not compatible with the <code>mimeType</code>s specified for the {{domxref("SourceBuffer")}} objects that already exist in {{domxref("MediaSource.sourceBuffers")}}.</td>
+  </tr>
+  <tr>
+   <td><code>QuotaExceededError</code></td>
+   <td>The user agent can't handle any more SourceBuffer objects, or creating a SourceBuffer based on this <code>mimeType</code> would result in an unsupported <a href="https://w3c.github.io/media-source/#sourcebuffer-configuration">SourceBuffer configuration.</a></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Example">Example</h2>
+
+<p>The following snippet is from a simple example written by Nick Desaulniers (<a href="http://nickdesaulniers.github.io/netfix/demo/bufferAll.html">view the full demo live</a>, or <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  language-js">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"';
+
+<code class="language-js"><span class="keyword token">if</span> <span class="punctuation token">(</span><span class="string token">'MediaSource'</span> <span class="keyword token">in</span> window <span class="operator token">&amp;&amp;</span> MediaSource<span class="punctuation token">.</span><span class="function token">isTypeSupported<span class="punctuation token">(</span></span>mimeCodec<span class="punctuation token">)</span><span class="punctuation token">)</span> <span class="punctuation token">{</span>
+  <span class="keyword token">var</span> mediaSource <span class="operator token">=</span> <span class="keyword token">new</span> <span class="class-name token">MediaSource</span><span class="punctuation token">;</span>
+ <span class="comment token"> //console.log(mediaSource.readyState); // closed
+</span>  video<span class="punctuation token">.</span>src <span class="operator token">=</span> URL<span class="punctuation token">.</span><span class="function token">createObjectURL<span class="punctuation token">(</span></span>mediaSource<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  mediaSource<span class="punctuation token">.</span><span class="function token">addEventListener<span class="punctuation token">(</span></span><span class="string token">'sourceopen'</span><span class="punctuation token">,</span> sourceOpen<span class="punctuation token">)</span><span class="punctuation token">;</span>
+<span class="punctuation token">}</span> <span class="keyword token">else</span> <span class="punctuation token">{</span>
+  console<span class="punctuation token">.</span><span class="function token">error<span class="punctuation token">(</span></span><span class="string token">'Unsupported MIME type or codec: '</span><span class="punctuation token">,</span> mimeCodec<span class="punctuation token">)</span><span class="punctuation token">;</span>
+<span class="punctuation token">}</span>
+
+<span class="keyword token">function</span> sourceOpen <span class="punctuation token">(</span>_<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+ <span class="comment token"> //console.log(this.readyState); // open
+</span>  <span class="keyword token">var</span> mediaSource <span class="operator token">=</span> <span class="keyword token">this</span><span class="punctuation token">;</span>
+  <span class="keyword token">var</span> sourceBuffer <span class="operator token">=</span> mediaSource<span class="punctuation token">.</span><span class="function token">addSourceBuffer<span class="punctuation token">(</span></span>mimeCodec<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  <span class="function token">fetchAB<span class="punctuation token">(</span></span>assetURL<span class="punctuation token">,</span> <span class="keyword token">function</span> <span class="punctuation token">(</span>buf<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+    sourceBuffer<span class="punctuation token">.</span><span class="function token">addEventListener<span class="punctuation token">(</span></span><span class="string token">'updateend'</span><span class="punctuation token">,</span> <span class="keyword token">function</span> <span class="punctuation token">(</span>_<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+      mediaSource<span class="punctuation token">.</span><span class="function token">endOfStream<span class="punctuation token">(</span></span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+      video<span class="punctuation token">.</span><span class="function token">play<span class="punctuation token">(</span></span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+     <span class="comment token"> //console.log(mediaSource.readyState); // ended
+</span>    <span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+    sourceBuffer<span class="punctuation token">.</span><span class="function token">appendBuffer<span class="punctuation token">(</span></span>buf<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  <span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+<span class="punctuation token">}</span><span class="punctuation token">;</span></code></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', '#widl-MediaSource-addSourceBuffer-SourceBuffer-DOMString-type', 'addSourceBuffer()')}}</td>
+   <td>{{Spec2('Media Source Extensions')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari (WebKit)</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>23</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop("25.0")}}<sup>[1]</sup><br>
+    {{CompatGeckoDesktop("42.0")}}</td>
+   <td>11<sup>[2]</sup></td>
+   <td>15</td>
+   <td>8</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Edge</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>Firefox OS (Gecko)</th>
+   <th>IE Phone</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>4.4.4</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>
+    <p>{{CompatNo}}</p>
+   </td>
+   <td>{{CompatNo}}</td>
+   <td>11</td>
+   <td>30</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] Available after switching the <code>about:config</code> preference <code>media.mediasource.enabled</code> to <code>true</code>. In addition, support was limited to a whitelist of sites, for example YouTube, Netflix, and other popular streaming sites. The whitelist was removed and Media Source Extensions was enabled by default in 42+ for all sites.</p>
+
+<p>[2] Only works on Windows 8+.</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{domxref("SourceBuffer")}}</li>
+ <li>{{domxref("SourceBufferList")}}</li>
+</ul>
diff --git a/files/zh-cn/web/api/mediasource/duration/index.html b/files/zh-cn/web/api/mediasource/duration/index.html
new file mode 100644
index 0000000000..400256f465
--- /dev/null
+++ b/files/zh-cn/web/api/mediasource/duration/index.html
@@ -0,0 +1,94 @@
+---
+title: MediaSource.duration
+slug: Web/API/MediaSource/duration
+translation_of: Web/API/MediaSource/duration
+---
+<div>{{APIRef("Media Source Extensions")}}{{SeeCompatTable}}</div>
+
+<p>{{domxref("MediaSource")}} 接口的属性 <code><strong>duration</strong></code> 用来获取或者设置当前媒体展示的时长.</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: js">mediaSource.duration = 5.5; // 5.5 seconds
+
+var myDuration = mediaSource.duration;</pre>
+
+<h3 id="值">值</h3>
+
+<p>以秒为单位的 双精度浮点数.</p>
+
+<h3 id="错误">错误</h3>
+
+<p>设置新的值的时候可能会有下面的错误抛出.</p>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">错误</th>
+   <th scope="col">异常</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td><code>InvalidAccessError</code></td>
+   <td>时长尝试设置一个负数, 或者 <code>NaN</code>.</td>
+  </tr>
+  <tr>
+   <td><code>InvalidStateError</code></td>
+   <td>{{domxref("MediaSource.readyState")}} 状态不是 <code>open</code>, 或者 一个或多个 {{domxref("SourceBuffer")}} 对象在 {{domxref("MediaSource.sourceBuffers")}} 中被更新  (例如. 该 {{domxref("SourceBuffer.updating")}}属性 为 <code>true</code>.)</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="例子">例子</h2>
+
+<p>下面的代码片段取自 Nick Desaulniers写的简单例子 (想进一步了解 <a href="http://nickdesaulniers.github.io/netfix/demo/bufferAll.html">查看完整例子</a>, 或者 <a href="https://github.com/nickdesaulniers/netfix/blob/gh-pages/demo/bufferAll.html">下载源代码</a> .)</p>
+
+<pre class="brush: js  language-js"><code class="language-js"><span class="keyword token">function</span> sourceOpen <span class="punctuation token">(</span>_<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+ <span class="comment token"> //console.log(this.readyState); // open
+</span>  <span class="keyword token">var</span> mediaSource <span class="operator token">=</span> <span class="keyword token">this</span><span class="punctuation token">;</span>
+  <span class="keyword token">var</span> sourceBuffer <span class="operator token">=</span> mediaSource<span class="punctuation token">.</span><span class="function token">addSourceBuffer<span class="punctuation token">(</span></span>mimeCodec<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  <span class="function token">fetchAB<span class="punctuation token">(</span></span>assetURL<span class="punctuation token">,</span> <span class="keyword token">function</span> <span class="punctuation token">(</span>buf<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+    sourceBuffer<span class="punctuation token">.</span><span class="function token">addEventListener<span class="punctuation token">(</span></span><span class="string token">'updateend'</span><span class="punctuation token">,</span> <span class="keyword token">function</span> <span class="punctuation token">(</span>_<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+      mediaSource<span class="punctuation token">.</span><span class="function token">endOfStream<span class="punctuation token">(</span></span><span class="punctuation token">)</span><span class="punctuation token">;
+      mediaSource.duration = 120;</span>
+      video<span class="punctuation token">.</span><span class="function token">play<span class="punctuation token">(</span></span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+     <span class="comment token"> //console.log(mediaSource.readyState); // ended
+</span>    <span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+    sourceBuffer<span class="punctuation token">.</span><span class="function token">appendBuffer<span class="punctuation token">(</span></span>buf<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  <span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+<span class="punctuation token">}</span><span class="punctuation token">;
+
+...</span></code></pre>
+
+<h2 id="规范">规范</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', '#widl-MediaSource-duration', 'duration')}}</td>
+   <td>{{Spec2('Media Source Extensions')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>
+
+
+<p>{{Compat("api.MediaSource.duration")}}</p>
+</div>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{domxref("SourceBuffer")}}</li>
+ <li>{{domxref("SourceBufferList")}}</li>
+</ul>
diff --git a/files/zh-cn/web/api/mediasource/endofstream/index.html b/files/zh-cn/web/api/mediasource/endofstream/index.html
new file mode 100644
index 0000000000..ca5ad6b67d
--- /dev/null
+++ b/files/zh-cn/web/api/mediasource/endofstream/index.html
@@ -0,0 +1,111 @@
+---
+title: MediaSource.endOfStream()
+slug: Web/API/MediaSource/endOfStream
+translation_of: Web/API/MediaSource/endOfStream
+---
+<div>{{APIRef("Media Source Extensions")}}{{SeeCompatTable}}</div>
+
+<p>{{domxref("MediaSource")}} 接口的 <code><strong>endOfStream()</strong></code> 方法意味着流的结束。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: js">mediaSource.endOfStream(endOfStreamError);</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>endOfStreamError {{optional_inline}}</dt>
+ <dd>一个 {{domxref("DOMString")}}，表示当流结束之时需要抛出的异常名。可选的值为：
+ <ul>
+  <li><code>network</code>: Terminates playback and signals that a network error has occured. This can be used create a custom error handler related to media streams. For example, you might have a function that handles media chunk requests, separate from other network requests. When you make an <a href="/en-US/docs/Web/API/XMLHttpRequest">XMLHttpRequest</a> call for a media chunk, and <code>onabort</code> or <code>onerror</code> triggers, you might want to call <code>endOfStream('network')</code>, display a descriptive message in the UI, and maybe retry the network request immediately or wait until the network is back up (via some kind of polling.)</li>
+  <li><code>decode</code>: Terminates playback and signals that a decoding error has occured. This can be used to indicate that a parsing error has occured while fetching media data; maybe the data is corrupt, or is encoded using a codec that the browser doesn't know how to decode.</li>
+ </ul>
+ </dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>无。</p>
+
+<h3 id="错误">错误</h3>
+
+<p>修改此属性值的时候，以下异常可能会被触发。</p>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">错误</th>
+   <th scope="col">解释</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td><code>InvalidStateError</code></td>
+   <td>{{domxref("MediaSource.readyState")}} is not equal to <code>open</code>, or one or more of the {{domxref("SourceBuffer")}} objects in {{domxref("MediaSource.sourceBuffers")}} are being updated (i.e. their {{domxref("SourceBuffer.updating")}} property is <code>true</code>.)</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="示例">示例</h2>
+
+<p>下面的代码段来自于 Nick Desaulniers 的一个简单的例子。(<a href="http://nickdesaulniers.github.io/netfix/demo/bufferAll.html">查看完整示例</a>，或者<a href="https://github.com/nickdesaulniers/netfix/blob/gh-pages/demo/bufferAll.html">下载源代码</a>以供学习。)</p>
+
+<pre class="brush: js  language-js">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"';
+
+<code class="language-js"><span class="keyword token">if</span> <span class="punctuation token">(</span><span class="string token">'MediaSource'</span> <span class="keyword token">in</span> window <span class="operator token">&amp;&amp;</span> MediaSource<span class="punctuation token">.</span><span class="function token">isTypeSupported<span class="punctuation token">(</span></span>mimeCodec<span class="punctuation token">)</span><span class="punctuation token">)</span> <span class="punctuation token">{</span>
+  <span class="keyword token">var</span> mediaSource <span class="operator token">=</span> <span class="keyword token">new</span> <span class="class-name token">MediaSource</span><span class="punctuation token">;</span>
+ <span class="comment token"> //console.log(mediaSource.readyState); // closed
+</span>  video<span class="punctuation token">.</span>src <span class="operator token">=</span> URL<span class="punctuation token">.</span><span class="function token">createObjectURL<span class="punctuation token">(</span></span>mediaSource<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  mediaSource<span class="punctuation token">.</span><span class="function token">addEventListener<span class="punctuation token">(</span></span><span class="string token">'sourceopen'</span><span class="punctuation token">,</span> sourceOpen<span class="punctuation token">)</span><span class="punctuation token">;</span>
+<span class="punctuation token">}</span> <span class="keyword token">else</span> <span class="punctuation token">{</span>
+  console<span class="punctuation token">.</span><span class="function token">error<span class="punctuation token">(</span></span><span class="string token">'Unsupported MIME type or codec: '</span><span class="punctuation token">,</span> mimeCodec<span class="punctuation token">)</span><span class="punctuation token">;</span>
+<span class="punctuation token">}</span>
+
+<span class="keyword token">function</span> sourceOpen <span class="punctuation token">(</span>_<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+ <span class="comment token"> //console.log(this.readyState); // open
+</span>  <span class="keyword token">var</span> mediaSource <span class="operator token">=</span> <span class="keyword token">this</span><span class="punctuation token">;</span>
+  <span class="keyword token">var</span> sourceBuffer <span class="operator token">=</span> mediaSource<span class="punctuation token">.</span><span class="function token">addSourceBuffer<span class="punctuation token">(</span></span>mimeCodec<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  <span class="function token">fetchAB<span class="punctuation token">(</span></span>assetURL<span class="punctuation token">,</span> <span class="keyword token">function</span> <span class="punctuation token">(</span>buf<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+    sourceBuffer<span class="punctuation token">.</span><span class="function token">addEventListener<span class="punctuation token">(</span></span><span class="string token">'updateend'</span><span class="punctuation token">,</span> <span class="keyword token">function</span> <span class="punctuation token">(</span>_<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+      mediaSource<span class="punctuation token">.</span><span class="function token">endOfStream<span class="punctuation token">(</span></span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+      video<span class="punctuation token">.</span><span class="function token">play<span class="punctuation token">(</span></span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+     <span class="comment token"> //console.log(mediaSource.readyState); // ended
+</span>    <span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+    sourceBuffer<span class="punctuation token">.</span><span class="function token">appendBuffer<span class="punctuation token">(</span></span>buf<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  <span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+<span class="punctuation token">}</span><span class="punctuation token">;</span></code></pre>
+
+<h2 id="规范">规范</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', '#widl-MediaSource-endOfStream-void-EndOfStreamError-error', 'endOfStream()')}}</td>
+   <td>{{Spec2('Media Source Extensions')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>
+
+
+<p>{{Compat("api.MediaSource.endOfStream")}}</p>
+</div>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{domxref("SourceBuffer")}}</li>
+ <li>{{domxref("SourceBufferList")}}</li>
+</ul>
diff --git a/files/zh-cn/web/api/mediasource/index.html b/files/zh-cn/web/api/mediasource/index.html
new file mode 100644
index 0000000000..bd15ef934d
--- /dev/null
+++ b/files/zh-cn/web/api/mediasource/index.html
@@ -0,0 +1,128 @@
+---
+title: MediaSource
+slug: Web/API/MediaSource
+translation_of: Web/API/MediaSource
+---
+<p>{{APIRef("Media Source Extensions")}}{{SeeCompatTable}}</p>
+
+<p><strong><code>MediaSource</code></strong>是<a href="/en-US/docs/Web/API/Media_Source_Extensions_API">Media Source Extensions API</a> 表示媒体资源{{domxref("HTMLMediaElement")}}对象的接口。<code>MediaSource</code> 对象可以附着在{{domxref("HTMLMediaElement")}}在客户端进行播放。</p>
+
+<h2 id="构造函数">构造函数</h2>
+
+<dl>
+ <dt>{{domxref("MediaSource.MediaSource", "MediaSource()")}}</dt>
+ <dd>构造并且返回一个新的<code>MediaSource</code>的空对象（with no associated source buffers）。</dd>
+</dl>
+
+<h2 id="属性">属性</h2>
+
+<dl>
+ <dt>{{domxref("MediaSource.sourceBuffers")}} {{readonlyInline}}</dt>
+ <dd>返回一个{{domxref("SourceBufferList")}} 对象，包含了这个<code>MediaSource的</code>{{domxref("SourceBuffer")}}的对象列表。</dd>
+ <dt>{{domxref("MediaSource.activeSourceBuffers")}} {{readonlyInline}}</dt>
+ <dd>返回一个 {{domxref("SourceBufferList")}} 对象，包含了这个{{domxref("MediaSource.sourceBuffers")}}中的{{domxref("SourceBuffer")}} 子集的对象—即提供当前被选中的视频轨 (video track)，启用的音频轨 (audio tracks) 以及显示/隐藏的字幕轨 (text tracks) 的对象列表。</dd>
+ <dt> </dt>
+ <dt>{{domxref("MediaSource.readyState")}} {{readonlyInline}}</dt>
+ <dd><code><font face="Open Sans, arial, x-locale-body, sans-serif">返回一个包含当前</font>MediaSource</code>状态的集合，即使它当前没有附着到一个media元素(<code>closed</code>)，或者已附着并准备接收{{domxref("SourceBuffer")}} 对象 (<code>open</code>)，亦或者已附着但这个流已被{{domxref("MediaSource.endOfStream()")}}关闭(<code>ended</code>.)</dd>
+ <dt>{{domxref("MediaSource.duration")}}</dt>
+ <dd>获取和设置当前正在推流媒体的持续时间。</dd>
+</dl>
+
+<dl>
+</dl>
+
+<dl>
+</dl>
+
+<h2 id="方法">方法</h2>
+
+<p><em>从父接口{{domxref("EventTarget")}}上继承而来。</em></p>
+
+<dl>
+ <dt>{{domxref("MediaSource.addSourceBuffer()")}}</dt>
+ <dd>创建一个带有给定MIME类型的新的 {{domxref("SourceBuffer")}} 并添加到 <code>MediaSource 的 </code>{{domxref("SourceBuffers")}} 列表。</dd>
+ <dt>{{domxref("MediaSource.removeSourceBuffer()")}}</dt>
+ <dd>删除指定的{{domxref("SourceBuffer")}} 从这个<code>MediaSource</code>对象中的 {{domxref("SourceBuffers")}}列表。</dd>
+ <dt>{{domxref("MediaSource.endOfStream()")}}</dt>
+ <dd>表示流的结束。</dd>
+ <dt>
+ <h2 id="静态方法">静态方法</h2>
+ </dt>
+ <dt>{{domxref("MediaSource.isTypeSupported()")}}</dt>
+ <dd>返回一个 {{domxref("Boolean")}} 值表明给定的MIME类型是否被当前的浏览器支持——这意味着是否可以成功的创建这个MIME类型的{{domxref("SourceBuffer")}} 对象。</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<p>这个例子尽可能快地逐块加载视频，并在加载好后立刻播放。 这个示例是由Nick Desaulniers 编写，你可以<a href="http://nickdesaulniers.github.io/netfix/demo/bufferAll.html">点这里查看</a>  (你也可以<a href="https://github.com/nickdesaulniers/netfix/blob/gh-pages/demo/bufferAll.html">点这里下载</a>来进一步研究)。</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="说明">说明</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', '#mediasource', 'MediaSource')}}</td>
+   <td>{{Spec2('Media Source Extensions')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器支持情况">浏览器支持情况</h2>
+
+<div>
+<p>{{Compat("api.MediaSource")}}</p>
+</div>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{domxref("SourceBuffer")}}</li>
+ <li>{{domxref("SourceBufferList")}}</li>
+</ul>
diff --git a/files/zh-cn/web/api/mediasource/mediasource/index.html b/files/zh-cn/web/api/mediasource/mediasource/index.html
new file mode 100644
index 0000000000..a36f3133b8
--- /dev/null
+++ b/files/zh-cn/web/api/mediasource/mediasource/index.html
@@ -0,0 +1,54 @@
+---
+title: MediaSource.MediaSource()
+slug: Web/API/MediaSource/MediaSource
+translation_of: Web/API/MediaSource/MediaSource
+---
+<div>{{APIRef("Media Source Extensions")}}{{SeeCompatTable}}</div>
+
+<p><code><strong>MediaSource()</strong></code> 是 {{domxref("MediaSource")}} 的构造函数 返回一个没有分配source buffers 新的 <code>MediaSource</code> 对象.</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: js">var mediaSource = new MediaSource();</pre>
+
+<h3 id="参数">参数</h3>
+
+<p>无.</p>
+
+<h2 id="例子">例子</h2>
+
+<p>下面的代码片段取自 Nick Desaulniers写的简单例子 (想进一步了解 <a href="http://nickdesaulniers.github.io/netfix/demo/bufferAll.html">查看完整例子</a> 或者 <a href="https://github.com/nickdesaulniers/netfix/blob/gh-pages/demo/bufferAll.html">下载源代码</a> .)</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);
+}
+
+...
+</pre>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>
+
+
+<p>{{Compat("api.MediaSource.MediaSource")}}</p>
+</div>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{domxref("SourceBuffer")}}</li>
+ <li>{{domxref("SourceBufferList")}}</li>
+</ul>
diff --git a/files/zh-cn/web/api/mediasource/readystate/index.html b/files/zh-cn/web/api/mediasource/readystate/index.html
new file mode 100644
index 0000000000..6a8831abd0
--- /dev/null
+++ b/files/zh-cn/web/api/mediasource/readystate/index.html
@@ -0,0 +1,136 @@
+---
+title: MediaSource.readyState
+slug: Web/API/MediaSource/readyState
+translation_of: Web/API/MediaSource/readyState
+---
+<div>{{APIRef("Media Source Extensions")}}{{SeeCompatTable}}</div>
+
+<p><code><strong>readyState</strong></code>是 {{domxref("MediaSource")}} 接口的一个只读属性。它返回一个集合表明当前<code>MediaSource</code>的状态。它有三种可能的返回值：</p>
+
+<ul>
+ <li><code>closed</code>: 当前源并未附着到一个media元素上。</li>
+ <li><code>open</code>: 当前源已附着到一个media元素并准备好接收 {{domxref("SourceBuffer")}} 对象。</li>
+ <li><code>ended</code>: 当前源已附着到一个media元素，但流已被{{domxref("MediaSource.endOfStream()")}}结束。</li>
+</ul>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: js">var myReadyState = mediaSource.readyState;</pre>
+
+<h3 id="值">值</h3>
+
+<p>A {{domxref("DOMString")}}.</p>
+
+<h2 id="例子">例子</h2>
+
+<p>The following snippet is from a simple example written by Nick Desaulniers (<a href="http://nickdesaulniers.github.io/netfix/demo/bufferAll.html">view the full demo live</a>, or <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  language-js"><code class="language-js"><span class="keyword token">if</span> <span class="punctuation token">(</span><span class="string token">'MediaSource'</span> <span class="keyword token">in</span> window <span class="operator token">&amp;&amp;</span> MediaSource<span class="punctuation token">.</span><span class="function token">isTypeSupported<span class="punctuation token">(</span></span>mimeCodec<span class="punctuation token">)</span><span class="punctuation token">)</span> <span class="punctuation token">{</span>
+  <span class="keyword token">var</span> mediaSource <span class="operator token">=</span> <span class="keyword token">new</span> <span class="class-name token">MediaSource</span><span class="punctuation token">;</span>
+ <span class="comment token"> //console.log(mediaSource.readyState); // closed
+</span>  video<span class="punctuation token">.</span>src <span class="operator token">=</span> URL<span class="punctuation token">.</span><span class="function token">createObjectURL<span class="punctuation token">(</span></span>mediaSource<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  mediaSource<span class="punctuation token">.</span><span class="function token">addEventListener<span class="punctuation token">(</span></span><span class="string token">'sourceopen'</span><span class="punctuation token">,</span> sourceOpen<span class="punctuation token">)</span><span class="punctuation token">;</span>
+<span class="punctuation token">}</span> <span class="keyword token">else</span> <span class="punctuation token">{</span>
+  console<span class="punctuation token">.</span><span class="function token">error<span class="punctuation token">(</span></span><span class="string token">'Unsupported MIME type or codec: '</span><span class="punctuation token">,</span> mimeCodec<span class="punctuation token">)</span><span class="punctuation token">;</span>
+<span class="punctuation token">}</span>
+
+<span class="keyword token">function</span> sourceOpen <span class="punctuation token">(</span>_<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+ <span class="comment token"> //console.log(this.readyState); // open
+</span>  <span class="keyword token">var</span> mediaSource <span class="operator token">=</span> <span class="keyword token">this</span><span class="punctuation token">;</span>
+  <span class="keyword token">var</span> sourceBuffer <span class="operator token">=</span> mediaSource<span class="punctuation token">.</span><span class="function token">addSourceBuffer<span class="punctuation token">(</span></span>mimeCodec<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  <span class="function token">fetchAB<span class="punctuation token">(</span></span>assetURL<span class="punctuation token">,</span> <span class="keyword token">function</span> <span class="punctuation token">(</span>buf<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+    sourceBuffer<span class="punctuation token">.</span><span class="function token">addEventListener<span class="punctuation token">(</span></span><span class="string token">'updateend'</span><span class="punctuation token">,</span> <span class="keyword token">function</span> <span class="punctuation token">(</span>_<span class="punctuation token">)</span> <span class="punctuation token">{</span>
+      mediaSource<span class="punctuation token">.</span><span class="function token">endOfStream<span class="punctuation token">(</span></span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+      video<span class="punctuation token">.</span><span class="function token">play<span class="punctuation token">(</span></span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+     <span class="comment token"> //console.log(mediaSource.readyState); // ended
+</span>    <span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+    sourceBuffer<span class="punctuation token">.</span><span class="function token">appendBuffer<span class="punctuation token">(</span></span>buf<span class="punctuation token">)</span><span class="punctuation token">;</span>
+  <span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
+<span class="punctuation token">}</span><span class="punctuation token">;</span></code></pre>
+
+<h2 id="规范">规范</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', '#widl-MediaSource-readyState', 'readyState')}}</td>
+   <td>{{Spec2('Media Source Extensions')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性表格">浏览器兼容性表格</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari (WebKit)</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>23</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop("25.0")}}<sup>[1]</sup><br>
+    {{CompatGeckoDesktop("42.0")}}</td>
+   <td>11<sup>[2]</sup></td>
+   <td>15</td>
+   <td>8</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Edge</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>Firefox OS (Gecko)</th>
+   <th>IE Phone</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>4.4.4</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>
+    <p>{{CompatNo}}</p>
+   </td>
+   <td>{{CompatNo}}</td>
+   <td>11</td>
+   <td>30</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] Available after switching the <code>about:config</code> preference <code>media.mediasource.enabled</code> to <code>true</code>. In addition, support was limited to a whitelist of sites, for example YouTube, Netflix, and other popular streaming sites. The whitelist was removed and Media Source Extensions was enabled by default in 42+ for all sites.</p>
+
+<p>[2] Only works on Windows 8+.</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{domxref("SourceBuffer")}}</li>
+ <li>{{domxref("SourceBufferList")}}</li>
+</ul>