title: how to use CV_CAP_PROP_FOURCC?
body: <p>It seems simple but I couldn't get it to work. I want to print out the format of an image by using </p>
  
  <pre><code>cvGetCaptureProperty(image, CV_CAP_PROP_FOURCC)
  </code></pre>
  
  <p>where <code>image</code> is an object of CvCapture struct. 
  This function returns <code>double</code>. I did convert it to char* so that I can print out the format but it didn't work. Any suggestions?</p>