getid3_matroska::BlockLacingType

		// 978307200 == mktime(0, 0, 0, 1, 1, 2001) == January 1, 2001 12:00:00am UTC
		return round(($EBMLdatestamp / 1000000000) + 978307200);
	}

	/**
	 * @param int $target_type
	 *
	 * @return string|int
	 */
	public static function TargetTypeValue($target_type) {
		// http://www.matroska.org/technical/specs/tagging/index.html