title: exporting a video file in reverse order on iphone
body: <p>I have been trying to export a video file in reverse order(play from end to start).
  any idea how it can be done efficiently?</p>
  
  <p>the best i could find is to create JPEGs files of the video frames (AVASSETREADER) and than to rewrite it in reverse order (AVASSETWRITER). but that is very slow.</p>
  
  <p>Thanks
  Amit</p>