title: Some YouTube iframe embeds not working in HTML5 mode
body: <p>A YouTube iframe can play a video using an HTML5 player instead of Flash, by adding "html5=1" as a URL parameter. However, this only works sometimes. For example the emebeds below are identical, except for the YouTube id in the iframe URL. The first iframe plays fine if there is no Flash player installed but the second requires flash. I've tried this in both Chrome and Firefox.</p>
  
  <pre><code>&lt;iframe title="YouTube video player" width="720" height="720" src="http://www.youtube.com/embed/O_ceIIJeVNQ?html5=1&amp;amp;modestbranding=1&amp;amp;controls=0&amp;amp;title&amp;amp;loop=1&amp;amp;playlist=O_ceIIJeVNQ&amp;amp;enablejsapi=1&amp;amp;origin=http%3A%2F%2Flocalhost%3A8080"&gt;&lt;/iframe&gt;
  
  &lt;iframe title="YouTube video player" width="720" height="720" src="http://www.youtube.com/embed/YmehSeNXXt4?html5=1&amp;amp;modestbranding=1&amp;amp;controls=0&amp;amp;title&amp;amp;loop=1&amp;amp;playlist=YmehSeNXXt4&amp;amp;enablejsapi=1&amp;amp;origin=http%3A%2F%2Flocalhost%3A8080"&gt;&lt;/iframe&gt;
  </code></pre>
  
  <p><a href="http://jsfiddle.net/judeosborn/2SAas" rel="nofollow">http://jsfiddle.net/judeosborn/2SAas</a></p>
  
  <p>Any idea how I can get embeds to play in HTML5 consistently?</p>