public static function isCommonVideo($file_name)
    {
        if (!self::isCommonFile($file_name) || $file_name{0}==='.' || @is_dir($file_name)) {
            return false;
        }
        $ext = self::getExtensionName($file_name);
        return ($ext ? in_array(strtolower($ext), self::$COMMON_VIDEOS_EXTS) : false);
    }