diff --git a/doc/APIchanges b/doc/APIchanges
index 21b448ae83..817aa485a5 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -15,6 +15,9 @@ libavutil:     2017-10-21
 
 API changes, most recent first:
 
+2020-06-xx - xxxxxxxxxx - lavu 56.54.100 - frame.h
+  Add AV_FRAME_DATA_SEI_UNREGISTERED.
+
 2020-06-xx - xxxxxxxxxx - lavu 56.53.100 - log.h opt.h
   Add av_opt_child_class_iterate() and AVClass.child_class_iterate().
   Deprecate av_opt_child_class_next() and AVClass.child_class_next().
diff --git a/libavutil/frame.c b/libavutil/frame.c
index 2e952edd29..9884eae054 100644
--- a/libavutil/frame.c
+++ b/libavutil/frame.c
@@ -851,6 +851,7 @@ const char *av_frame_side_data_name(enum AVFrameSideDataType type)
     case AV_FRAME_DATA_DYNAMIC_HDR_PLUS: return "HDR Dynamic Metadata SMPTE2094-40 (HDR10+)";
     case AV_FRAME_DATA_REGIONS_OF_INTEREST: return "Regions Of Interest";
     case AV_FRAME_DATA_VIDEO_ENC_PARAMS:            return "Video encoding parameters";
+    case AV_FRAME_DATA_SEI_UNREGISTERED:            return "H.26[45] User Data Unregistered SEI message";
     }
     return NULL;
 }
diff --git a/libavutil/frame.h b/libavutil/frame.h
index fc67db0f6c..3fb8c56be8 100644
--- a/libavutil/frame.h
+++ b/libavutil/frame.h
@@ -184,6 +184,14 @@ enum AVFrameSideDataType {
      * Encoding parameters for a video frame, as described by AVVideoEncParams.
      */
     AV_FRAME_DATA_VIDEO_ENC_PARAMS,
+
+    /**
+     * User data unregistered metadata associated with a video frame.
+     * This is the H.26[45] UDU SEI message, and shouldn't be used for any other purpose
+     * The data is stored as uint8_t in AVFrameSideData.data which is 16 bytes of
+     * uuid_iso_iec_11578 followed by AVFrameSideData.size - 16 bytes of user_data_payload_byte.
+     */
+    AV_FRAME_DATA_SEI_UNREGISTERED,
 };
 
 enum AVActiveFormatDescription {
diff --git a/libavutil/version.h b/libavutil/version.h
index c059c2e6e2..9b6adc2268 100644
--- a/libavutil/version.h
+++ b/libavutil/version.h
@@ -79,7 +79,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  56
-#define LIBAVUTIL_VERSION_MINOR  53
+#define LIBAVUTIL_VERSION_MINOR  54
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \