FFMPEG encoding progress

ffmpeg_progress.php

<?php

$logFile = 'progress_logs/%s.log';
$cmd = "/usr/local/bin/ffmpeg -i %s  -y progress_test.m4v 2> %s";

for ($i=1; $i < count($argv); $i++) {
  $video = $argv[$i];
  $log = sprintf($logFile, $video);

  exec(sprintf($cmd, $video, $log), $processOutput, $processStatus);

  if($processStatus == 0) {
    printf("=== Successfully encoded  %s ===\n", $video);
  }else{
    printf("=== Failed to encode %s with output: ===\n %s \n", $video, file_get_contents($log));
  }

  unlink($log);
}

track_progress.php

<?php

while(true) {
  $logs = glob('progress_logs/*');

  if(!count($logs)){
    echo "- NO VIDEO FILES ARE CURRENTLY PROCESSED -\n";
  }else{
    foreach($logs as $logName) {
      echo "=== Encoding progress for log {$logName} ===\n";
      $logContent = file_get_contents($logName);

      $totalDuration = totalDuration($logContent);
      $encodingProgressAt = encodingProgress($logContent);

      printf("Total duration of %s is %d seconds\n", $logName, $totalDuration);
      printf("Video encoding progress is at %d seconds\n", $encodingProgressAt);
      printf("Progress is at %d%%\n", ceil(($encodingProgressAt / $totalDuration)*100.0));

      echo "===========================\n";
    }
  }
  sleep(5);
}

function totalDuration($logContent) {
  preg_match("/Duration: (.*), start/", $logContent, $matches);

  return durationInSeconds($matches[1]);
}

function encodingProgress($logContent) {
  preg_match_all("/time=(.*?) bitrate/", $logContent, $matches);

  $matchesCount = count($matches[0]);
  $lastProgress = $matches[1][$matchesCount-1];
  return durationInSeconds($lastProgress);
}

function durationInSeconds($timeCode) {
  $pieces = explode(':', $timeCode);
  $hours    = $pieces[0] * 60 * 60;
  $minutes  = $pieces[1] * 60;
  $seconds  = $pieces[2];
  return $hours + $minutes + $seconds;
}