+#define kVGT_TAG MKTAG('k', 'V', 'G', 'T') /* TGV i-frame */
+#define fVGT_TAG MKTAG('f', 'V', 'G', 'T') /* TGV p-frame */
+#define mTCD_TAG MKTAG('m', 'T', 'C', 'D') /* MDEC */
+#define MADk_TAG MKTAG('M', 'A', 'D', 'k') /* MAD i-frame */
+#define MADm_TAG MKTAG('M', 'A', 'D', 'm') /* MAD p-frame */
+#define MADe_TAG MKTAG('M', 'A', 'D', 'e') /* MAD lqp-frame */
+#define MPCh_TAG MKTAG('M', 'P', 'C', 'h') /* MPEG2 */
+#define TGQs_TAG MKTAG('T', 'G', 'Q', 's') /* TGQ i-frame (appears in .TGQ files) */
+#define pQGT_TAG MKTAG('p', 'Q', 'G', 'T') /* TGQ i-frame (appears in .UV files) */
+#define pIQT_TAG MKTAG('p', 'I', 'Q', 'T') /* TQI/UV2 i-frame (.UV2/.WVE) */