title: NITE2::UserTracker crashes when reading from oni files
body: <p>I have recorded an oni file using a kinect and OpenNI NIViewer.</p>
  
  <p>I want to track skeletons in that record file so I am using OpenNI2 and NITE2</p>
  
  <p>I can create an openi device with the oni file but when I try to create a nite2 user tracker using that device it crashes and I get the following error:</p>
  
  <blockquote>
    <p>0xC0000005: Access violation reading location 0x000000000000004c</p>
  </blockquote>
  
  <p>On the cmd window I got the following message:</p>
  
  <blockquote>
    <p>Couldn't getXN_STREAM_PROPERTY_PARAM_COEFF</p>
  </blockquote>
  
  <p>Here is my code:</p>
  
  <pre><code>openni::Status rc = openni::OpenNI::initialize();
  openni::Device device ;
  rc = device.open("file.oni");
  nite::UserTracker userTracker;
  nite::NiTE::initialize();
  niteRc = userTracker.create(&amp;device);
  </code></pre>
  
  <p>Any Help is largely appreciated.</p>
  
  <p>Could you please also advise if there are any other ways to track selections in recorded oni files?</p>
  
  <p>Regards</p>