title: Html Video player plays sound but not video
body: <p>Im in the process of making a webpage, and im trying to insert a video. The video player loads fine, and you can press play, but only the audio plays, not the video. (When previewing in chrome)
  When viewing in firefox it works properly</p>
  
  <p>My code is as follows...</p>
  
  <pre><code>&lt;video width="600" height="400" controls&gt;
    &lt;source src="ds2.mp4" type="video/mp4"&gt;
    &lt;source src="ds2.ogv" type="video/ogv"&gt;
    &lt;source src="ds2.webm" type="video/webm"&gt;
  </code></pre>
  
  <p>Your browser does not support the video tag.</p>
  
  <pre><code>&lt;/video&gt;
  </code></pre>
  
  <p>My Doctype is <code>&lt;!Doctype html&gt;</code> </p>
  
  <p>I checked the MIME type, its Video/mp4. however, one of the mime requests is in red and cancelled (When checking with google dev tools networking)</p>
  
  <p>Im using microsoft expression web 4 (incase it is relevant)</p>
  
  <p>If i've neglected any important information please let me know and ill update the post :) Thanks in advance for your help :)</p>