+#define MATROSKA_ID_TRACKFLAGHEARINGIMPAIRED 0x55AB
+#define MATROSKA_ID_TRACKFLAGVISUALIMPAIRED 0x55AC
+#define MATROSKA_ID_TRACKFLAGTEXTDESCRIPTIONS 0x55AD
+#define MATROSKA_ID_TRACKFLAGORIGINAL 0x55AE
+#define MATROSKA_ID_TRACKFLAGCOMMENTARY 0x55AF