/**
  * Constructor
  * 
  * @param string $ffmpegBinary path to ffmpeg executable
  * @param boolean $persistent persistent functionality on/off
  */
 public function __construct($ffmpegBinary = 'ffmpeg', $persistent = false)
 {
     parent::__construct($ffmpegBinary, $persistent);
 }
 /**
  * Constructor
  * 
  * @param string $ffmpegBinary path to ffmpeg executable
  * @param boolean $persistent persistent functionality on/off
  */
 public function __construct($ffmpegBinary = 'ffmpeg', $persistent = false)
 {
     $this->_output = '';
     parent::__construct($ffmpegBinary, $persistent);
 }