title: HTML5 - mp4 video does not play in IE9
body: <p>I have an mp4 video that I want to play in IE9 using HTML5 <code>&lt;video&gt;</code> tag. I added the MIME type to IIS 7 so if I browse <code>http://localhost/video.mp4</code> it plays in both Chrome and IE9 but not in HTML5, Chrome plays the video in HTML though.  Here's the code:</p>
  
  <pre><code>&lt;html&gt;
  &lt;body&gt;
    &lt;video src="video.mp4" width="400" height="300" preload controls&gt;
    &lt;/video&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>Any ideas?</p>
  
  <p>Thanks</p>
  
  <p><strong>UPDATE:</strong></p>
  
  <p>Tried the same file in Firefox 5.0 and it didn't work either, only Chrome is able to play the mp4 video.</p>