title: rotate video with ffmpeg library for iPhone
body: <p>Is it possible to adjust the orientation of a video programmatically with the ffmeg library using objective-c?</p>
  
  <p>I have a recorded video (mov) file that is playing in the wrong orientation and would like to perform the adjustment.</p>
  
  <p>If ffmpeg is not the right approach, what is the simplest way to take a video and rotate it by 90 degrees?</p>