Transcodes files in a directory to mp4 using handbrakeCLI.

transcodeMP4.php

<?php

//Setup Content drives and Destination path
$contentPaths = array("/Volumes/VS400/", "/Volumes/SXServer/", "/Volumes/SXSafe/");
$destinationPath = "/Volumes/VODContent/mp4/";
$transcodeCommand = "HandBrakeCLI --preset \"iPhone & iPod Touch\" --width 320 --vb 500 --two-pass --turbo --optimize ";

//pid class used to determine if script is already running.
 class pid {

     protected $filename;
     public $already_running = false;

     function __construct($directory) {

         $this->filename = $directory . '/' . basename($_SERVER['PHP_SELF']) . '.pid';

         if(is_writable($this->filename) || is_writable($directory)) {

             if(file_exists($this->filename)) {
                 $pid = (int)trim(file_get_contents($this->filename));
                 if(posix_kill($pid, 0)) {
                     $this->already_running = true;
                 }
             }

         }
         else {
             die("Cannot write to pid file '$this->filename'. Program execution halted.\n");
         }

         if(!$this->already_running) {
             $pid = getmypid();
             file_put_contents($this->filename, $pid);
         }

     }

     public function __destruct() {

         if(!$this->already_running && file_exists($this->filename) && is_writeable($this->filename)) {
             unlink($this->filename);
         }

     }

 }


//Define some functions to do various tasks
function dirList ($directory) 
{

    // create an array to hold directory list
    $results = array();

    // create a handler for the directory
    $handler = opendir($directory);

    // keep going until all files in directory have been read
    while ($file = readdir($handler)) {

        // if $file isn't this directory or its parent, 
        // add it to the results array
        if ($file != '.' && $file != '..')
            $results[] = $file;
    }

    // tidy up: close the handler
    closedir($handler);

    // done!
    return $results;

}


function cleanFileName($fileName) {
	$cleanName = str_replace(" ", "\ ", $fileName);
	$cleanName = str_replace("(", "\(", $cleanName);
	$cleanName = str_replace(")", "\)", $cleanName);
	$cleanName = str_replace("'", "\'", $cleanName);
	
	return $cleanName;
}

function transcodeLog($msg)
 {
   print $msg."\n\n"; 
 // open file
 $fd = fopen("/usr/local/cablecastHelper/".date("Y-m-d").".log", "a");
 // write string
 fwrite($fd, $msg . "\n");
 // close file
 fclose($fd);
 }

//If this script is already running Exit
$pid = new pid('/tmp');
if($pid->already_running) {
    exit;
}
else
{
  
  /*******************************************
   *  File Finding
   *  Currently this finds valid cablecast shows.  
   *  Change to fit your needs
   *******************************************/
  
  $filesToTranscode = array();
  foreach($contentPaths as $dir)
  	{
  		$files = dirList($dir);
		  
  		foreach($files as $file) {
  			if(preg_match('/(^\b[0-9]+).*\.(mpg|mpeg|MPG|MPEG)/', $file, $matches))
  			{	
  				if(!file_exists($destinationPath.$matches[1]))  {
  					$filesToTranscode[] = array("showID" => $matches[1], "path" => cleanFileName($dir.$file));
  				}
  			}
  		}	
  	}
  	
  /*******************************************
   * Transcoding Files
   * This is where the magic happens
   *******************************************/
  foreach($filesToTranscode as $job)
  {
    transcodeLog(date("h:i:s")." - Transcoding: ".$job["path"]);
  	$command = $transcodeCommand."--input ".$job["path"]." --output ".$destinationPath.$job["showID"].".mp4";
  	exec($command, $output, $return);
  	if(file_exists($destinationPath.$job["showID"].".mp4"))  {
  		transcodeLog(date("h:i:s")." - Successfully transcoded: ".$destinationPath.$job["showID"].".mp4");
  	}
  }	
}
?>