title: No sound while playing MKV with HTML5
body: <p>I'm trying to play a .MKV file with HTML5. Video works fine but there is no sound, I can't unmute the video.</p>
  <pre><code>&lt;video src=&quot;video.mkv&quot; type='video/x-matroska' codecs='theora, vorbis'&gt;&lt;/video&gt;
  </code></pre>
  <p>I'm using Chrome 24.</p>