FFmpeg::ready PHP Метод

    public function ready($append = null)
    {
        /**
         *	Check if command is empty
         */
        if (empty($this->command)) {
            $this->output();
        }
        if (empty($this->command)) {
            trigger_error("Cannot execute a blank command", E_USER_ERROR);
            return false;
        } else {
            return exec($this->command . $append);
        }
    }