keyframe-analyser.php

<?php

  
  // Total Frames
  $tfr = $argv[1];
  // Frames Per Second
  $fps = $argv[2];
  // Key-frame Interval
  $kfi = $argv[3];
  // Total Key Frames
  $tkf = ($tfr - ($tfr % $kfi) ) / $kfi;
  // Elapsed Time
  $eti = ( $tfr - ($tfr % $fps) ) / $fps;
  
  echo "\n";
  echo "Total Frame Count  : $tfr\n";
  echo "Key-frame Interval : $kfi\n";
  echo "Frames Per Second  : $fps\n";
  echo "Total Run Time     : $eti Seconds\n";
  echo "Total Key-frames   : $tkf\n";
  echo "\n";
  
  for($i = 1; $i <= $tfr; $i++){
    $pad = str_pad($i, strlen($tfr), "0", STR_PAD_LEFT);
    if( !($i % $kfi) )
      echo "F$pad [X]";
    else
      echo "F$pad [ ]";
    echo ($i % $fps == 0) ? "\n" : null;
  }
  echo "\n";

usage php keyframe-analyser.php [frames] [fps] [key-frames]