title: Pre roll ads not working with videojs rtmp stream
body: <p>Pre roll ads are not working when I put an rtmp stream in videojs. The rtmp video start playing directly and the pre roll ad is not played. But the pre roll ads are working with VOD</p>
  
  <pre><code>&lt;video id="video"
       class="video-js vjs-default-skin"
       height="300"
       width="600" poster="http://jollyhoo.com/wp-content/uploads/2013/03/Priyanka-Chopra-Vogue-Magazine-March-2013-2.jpg" data-setup='{}'
       controls&gt;
  &lt;p&gt;
    Your browser doesn't support video. Please &lt;a href="http://browsehappy.com/"&gt;upgrade your browser&lt;/a&gt; to see the example.
  &lt;/p&gt;
  &lt;source src="rtmp://cp67126.edgefcs.net/ondemand/&amp;mp4:mediapm/ovp/content/test/video/spacealonehd_sounas_640_300.mp4" type='rtmp/mp4'&gt;
  
   &lt;/video&gt;
  
   &lt;script src="../video-js/video.js"&gt;&lt;/script&gt;
   &lt;script src="lib/videojs.ads.js"&gt;&lt;/script&gt;
   &lt;script src="src/videojs-preroll.js"&gt;&lt;/script&gt;
      &lt;script src="../videojs-logobrand-master/src/videojs.logobrand.js"&gt;     &lt;/script&gt;
   &lt;script&gt;
  // fire up the plugin
  videojs('video',{plugins:{ads:{},preroll:{src:"http://static.bouncingminds.com/ads/5secs/baileys_5sec.mp4",href:"http://videojs.com"}}});
   &lt;/script&gt;
  </code></pre>