title: Why can't open some HTML5 video when open `Use hardware acceleration when available`
body: <p>env:</p>
  
  <ul>
  <li>Windows 7 32bit</li>
  <li>Chrome v30</li>
  </ul>
  
  <p>Why can't open HTML5 video on some site, such as <a href="http://www.xuetangx.com/" rel="nofollow">xuetangx.com/</a> when check the <code>Use hardware acceleration when available</code> on Chrome setting?</p>
  
  <p>Is the vedio coding not supported on Chrome?  </p>
  
  <p>Thanks!</p>