title: "undefined" result using FileOpener Phonegap Android and failed to open video File?
body: <p>i have downloaded plugin  <a href="https://github.com/michalzubkowicz/FileOpener/tree/cordova-2.8.0" rel="nofollow noreferrer">FileOpener</a>
     and added in m,y project like this: </p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html lang="en"  dir="ltr"&gt;
  &lt;head&gt;
      &lt;meta charset="utf-8"&gt;
  
     &lt;meta name="viewport" content="width=device-width,  user-scalable=no"&gt;
     &lt;title&gt;sample&lt;/title&gt;
     &lt;link rel="stylesheet"  href="css/jquery.mobile-1.3.2.min.css"&gt;
    &lt;link rel="stylesheet"  href="css/adidas.css"&gt;
    &lt;script src="js/jquery.js"&gt;&lt;/script&gt;
    &lt;script src="js/jquery.mobile-1.3.2.min.js"&gt;&lt;/script&gt;
    &lt;script src="js/data_en.js"&gt;&lt;/script&gt;
    &lt;script src="js/data_sp.js"&gt;&lt;/script&gt;
    &lt;script src="js/adidas.js"&gt;&lt;/script&gt;
    &lt;script src="js/cordova.js"&gt;&lt;/script&gt;
    &lt;script src="js/video.js"&gt;&lt;/script&gt;
    &lt;script src="js/fileopener.js"&gt;&lt;/script&gt;
  
  &lt;/head&gt;
  &lt;body&gt;
   &lt;div data-role="page" data-theme="a" class="my-page" id="video"&gt;
    &lt;video id="video_player" src="#" controls="controls"&gt;&lt;/video&gt; 
  &lt;/div&gt;
  &lt;/body&gt;
  </code></pre>
  
  <p><strong>in  js file</strong></p>
  
  <pre><code>    $(document).on('pagebeforeshow',"#video", function () {
     var xyz = document.getElementById('video_player');
      alert("values xyz:" + xyz);
       var x =  window.plugins.fileOpener.open("file:///android_asset/www/videos/1974.mp4");
    xyz.src =  window.plugins.fileOpener.open("file:///android_asset/www/balls/1970.png");
  
      alert("opener:" + x);
      window.plugins.videoPlayer.play(x);
      alert("xyz after src:" +  xyz);
  });
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/ne6ry.png" alt=" **firstalert**">
  <img src="https://i.stack.imgur.com/FmOqd.png" alt="second alert">
  <img src="https://i.stack.imgur.com/NV90K.png" alt="third alert">
  i am failed to open any video file/ images from assets/www/videos/abcd.mp4   and similar for images </p>
  
  <p>now everything is working fine but this is alert when trying to hit play button : 
  <img src="https://i.stack.imgur.com/GB1yi.png" alt="enter image description here"></p>