title: PHP FFmpeg video aspect ratio problem
body: <p>i compiled the new version of FFMPEG and the padding commands have been deprecated.<br>
  As i try to get familiar with the new -vf pad= commands, i want to ask, how can i<br>
  convert a video without changing it's aspect ratio.  </p>
  
  <p>I've checked numerous solutions from stackoverflow, nothing seemed to work.<br>
  Can someone, please post a working PHP example or cmd line. I would be VERY happy.  </p>
  
  <p>Please note that the videos in question, could be 4:3 and also be 16:9  </p>
  
  <p>Let's say, i convert a 16:9 video to 640x480 format. It will need some bars at<br>
  the top and at the bottom. That is what i want to do.</p>
  
  <p>Thanks</p>