files/ja/web/api/mediastream/getvideotracks/index.html


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---
title: MediaStream.getVideoTracks()
slug: Web/API/MediaStream/getVideoTracks
translation_of: Web/API/MediaStream/getVideoTracks
---
<p>{{APIRef("Media Capture and Streams")}}{{SeeCompatTable}}</p>

<p>{{domxref("MediaStream")}}インタフェースの<strong><code>getVideoTracks()</code></strong>は、このストリームに含まれるビデオトラックを表現する{{domxref("MediaStreamTrack")}}オブジェクトの配列を返します。</p>

<h2 id="文法">文法</h2>

<pre class="syntaxbox">var <em>mediaStreamTracks[]</em> = <em>mediaStream</em>.getVideoTracks()</pre>

<h3 id="パラメータ">パラメータ</h3>

<p>なし。</p>

<h3 id="戻り値"><span style='font-family: x-locale-heading-primary,zillaslab,Palatino,"Palatino Linotype",x-locale-heading-secondary,serif; font-size: 1.375rem;'>戻り値</span></h3>

<p>{{domxref("MediaStreamTrack")}}の配列。</p>

<h3 id="例外">例外</h3>

<h2 id="例">例</h2>

<p>次の例は、<a href="https://googlechrome.github.io/samples/image-capture/photo-resolution.html">Chrome's Image Capture / Photo Resolution Sample</a> (英語)から抜粋したものであり、<code>getVideoTracks()</code>を用いて取得したトラックを{{domxref("ImageCapture.ImageCapture", "ImageCapture()")}}コンストラクタへ渡しています。</p>

<pre class="brush: js"><code>const input = document.querySelector('input[type="range"]');

var imageCapture;

navigator.mediaDevices.getUserMedia({video: true})
.then(mediaStream =&gt; {
  document.querySelector('video').srcObject = mediaStream;

  const track = mediaStream.getVideoTracks()[0];
  imageCapture = new ImageCapture(track);

  return imageCapture.getPhotoCapabilities();
})</code></pre>

<h2 id="仕様">仕様</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">仕様</th>
   <th scope="col">状況</th>
   <th scope="col">コメント</th>
  </tr>
  <tr>
   <td>{{SpecName('Media Capture','#dom-mediastream-getvideotracks','getVideoTracks()')}}</td>
   <td>{{Spec2('Media Capture')}}</td>
   <td>初版</td>
  </tr>
 </tbody>
</table>

<h2 id="ブラウザ互換性">ブラウザ互換性</h2>

<div>{{CompatibilityTable}}</div>

<div id="compat-desktop">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Chrome</th>
   <th>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari (WebKit)</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Android Webview</th>
   <th>Chrome for Android</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>Firefox OS</th>
   <th>IE Mobile</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>