title: Trying to get full video duration but returning as Nan
body: <p>I am trying to get the video duration of my player but it returns <code>NaN</code>, I am not entirely sure how to access it from here.</p>
  
  <pre><code>&lt;video id="videoPlayerNew" class="video-js vjs-default-skin vjs-controls-enabled" poster="http://camendesign.com/code/video_for_everybody/poster.jpg" data-setup="{}" controls=""&gt;
      &lt;source src="sample.mp4" type="video/mp4"&gt;
      &lt;p class="vjs-no-js"&gt;Javascript was disabled or not supported&lt;/p&gt;
  &lt;/video&gt;
  
  &lt;script&gt;
      var vid = document.getElementById("videoPlayerNew");
      console.log(vid.duration);
  &lt;/script&gt;
  </code></pre>
  
  <p>The log tells me: <code>NaN</code></p>