title: Playback rate doesn't change for Chromecast Ultra
body: <p>I have been working on app, which has possiblity to cast video to chromecast devices. And we have such problem: we need to change playback rate and it works  for Chromecast 2.0 (as needed), and doesn't work for Chromecast Ultra (playback rate as default).</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;head&gt;
    &lt;script type="text/javascript" src="bohdan_player.js"&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
      &lt;audio id="audioPlayer" src="https://www2.iis.fraunhofer.de/AAC/ChID-BLITS-EBU-Narration.mp4" autoplay controls&gt;&lt;/audio&gt;
  
      &lt;script&gt;
          document.getElementById("audioPlayer").playbackRate = 1.5;
      &lt;/script&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>