title: Find the duration of a mp4 - iPhone SDK
body: <p>How can I find the duration of a mp4 file to hours and minutes. I have tried loading the URL in a MPMoviePlayerViewController and use the duration property which I then convert the nstimeinterval to a string but it always results in 0. Is there any method to do this? </p>
  
  <p>Thanks,</p>
  
  <p>Kevin</p>