title: OpenCV 'cvQueryFrame' non-blocking on OS X?
body: <p>when I perform a cvQueryFrame on Windows, the API blocks until an image is delivered. On Mac OS X, I am at 100% CPU utilization, while only querying for an image and displaying it in a window. I am at the latest SVN version. Can anyone confirm my experience? Am I doing something wrong? Is there a work-around?</p>
  
  <p>My loop code looks like this:</p>
  
  <pre><code>while(key != 'q') {
      if (frame)
          cvShowImage("Live Cam", frame);
      frame = NULL;
      frame = cvQueryFrame(capture);
      key = cvWaitKey(10);
  }
  </code></pre>