title: TinyMCE keeps adding default video width and height
body: <p>I've got a video pasted into tinymce but I need to stop it defining the dimensions automatically as I'd like to control them via css instead.</p>
  
  <p>So I paste in:</p>
  
  <pre><code>&lt;video id="sampleMovie" preload="" controls="controls" poster="/video/video.png"&gt;&lt;source src="/video/video.mp4" type="video/mp4" /&gt;&lt;/video&gt;
  </code></pre>
  
  <p>But then tinymce automatically pastes in annoying default dimensions for me and it ends up being:</p>
  
  <pre><code>&lt;video width="300" height="150" id="sampleMovie" preload="" controls="controls" poster="/video/video.png"&gt;
  &lt;source src="/video/video.mp4" type="video/mp4" /&gt;&lt;/video&gt;
  </code></pre>
  
  <p>Which I really, really don't want. Is there a way to stop this?</p>
  
  <p>In my init code I've already got:</p>
  
  <pre><code>relative_urls: false,
  cleanup: false,
  verify_html : false,
  </code></pre>