diff --git a/python/src/ustreamer.c b/python/src/ustreamer.c
index f2d9caf..f1d27f0 100644
--- a/python/src/ustreamer.c
+++ b/python/src/ustreamer.c
@@ -236,6 +236,7 @@ static PyObject *_MemsinkObject_wait_frame(_MemsinkObject *self, PyObject *args,
 	SET_NUMBER(stride, Long, Long);
 	SET_NUMBER(online, Long, Bool);
 	SET_NUMBER(key, Long, Bool);
+	SET_NUMBER(gop, Long, Long);
 	SET_NUMBER(grab_ts, Double, Float);
 	SET_NUMBER(encode_begin_ts, Double, Float);
 	SET_NUMBER(encode_end_ts, Double, Float);
diff --git a/src/dump/file.c b/src/dump/file.c
index 43e7bcd..9a30094 100644
--- a/src/dump/file.c
+++ b/src/dump/file.c
@@ -52,11 +52,11 @@ void us_output_file_write(void *v_output, const us_frame_s *frame) {
 		us_base64_encode(frame->data, frame->used, &output->base64_data, &output->base64_allocated);
 		fprintf(output->fp,
 			"{\"size\": %zu, \"width\": %u, \"height\": %u,"
-			" \"format\": %u, \"stride\": %u, \"online\": %u, \"key\": %u,"
+			" \"format\": %u, \"stride\": %u, \"online\": %u, \"key\": %u, \"gop\": %u,"
 			" \"grab_ts\": %.3Lf, \"encode_begin_ts\": %.3Lf, \"encode_end_ts\": %.3Lf,"
 			" \"data\": \"%s\"}\n",
 			frame->used, frame->width, frame->height,
-			frame->format, frame->stride, frame->online, frame->key,
+			frame->format, frame->stride, frame->online, frame->key, frame->gop,
 			frame->grab_ts, frame->encode_begin_ts, frame->encode_end_ts,
 			output->base64_data);
 	} else {
diff --git a/src/dump/main.c b/src/dump/main.c
index f753301..4788d97 100644
--- a/src/dump/main.c
+++ b/src/dump/main.c
@@ -260,16 +260,16 @@ static int _dump_sink(
 			const long long now_second = us_floor_ms(now);
 
 			char fourcc_str[8];
-			US_LOG_VERBOSE("Frame: res=%ux%u, fmt=%s, stride=%u, online=%d, key=%d, kr=%d, latency=%.3Lf, diff=%.3Lf, size=%zu",
-				frame->width, frame->height,
+			US_LOG_VERBOSE("Frame: %s - %ux%u -- online=%d, key=%d, kr=%d, gop=%u, latency=%.3Lf, backlog=%.3Lf, size=%zu",
 				us_fourcc_to_string(frame->format, fourcc_str, 8),
-				frame->stride, frame->online, frame->key, key_requested,
+				frame->width, frame->height,
+				frame->online, frame->key, key_requested, frame->gop,
 				now - frame->grab_ts, (last_ts ? now - last_ts : 0),
 				frame->used);
 			last_ts = now;
 
-			US_LOG_DEBUG("       grab_ts=%.3Lf, encode_begin_ts=%.3Lf, encode_end_ts=%.3Lf",
-				frame->grab_ts, frame->encode_begin_ts, frame->encode_end_ts);
+			US_LOG_DEBUG("       stride=%u, grab_ts=%.3Lf, encode_begin_ts=%.3Lf, encode_end_ts=%.3Lf",
+				frame->stride, frame->grab_ts, frame->encode_begin_ts, frame->encode_end_ts);
 
 			if (now_second != fps_second) {
 				fps = fps_accum;
diff --git a/src/libs/frame.h b/src/libs/frame.h
index 9760555..952dd55 100644
--- a/src/libs/frame.h
+++ b/src/libs/frame.h
@@ -50,6 +50,7 @@ typedef struct {
 
 	bool		online;
 	bool		key;
+	unsigned	gop;
 
 	long double	grab_ts;
 	long double	encode_begin_ts;
@@ -64,6 +65,7 @@ typedef struct {
 		x_dest->stride = x_src->stride; \
 		x_dest->online = x_src->online; \
 		x_dest->key = x_src->key; \
+		x_dest->gop = x_src->gop; \
 		x_dest->grab_ts = x_src->grab_ts; \
 		x_dest->encode_begin_ts = x_src->encode_begin_ts; \
 		x_dest->encode_end_ts = x_src->encode_end_ts; \
@@ -81,6 +83,7 @@ static inline void us_frame_copy_meta(const us_frame_s *src, us_frame_s *dest) {
 		&& x_a->stride == x_b->stride \
 		&& x_a->online == x_b->online \
 		&& x_a->key == x_b->key \
+		&& x_a->gop == x_b->gop \
 	)
 
 
diff --git a/src/libs/memsinksh.h b/src/libs/memsinksh.h
index 6a90424..0ad2452 100644
--- a/src/libs/memsinksh.h
+++ b/src/libs/memsinksh.h
@@ -30,7 +30,7 @@
 
 
 #define US_MEMSINK_MAGIC	((uint64_t)0xCAFEBABECAFEBABE)
-#define US_MEMSINK_VERSION	((uint32_t)3)
+#define US_MEMSINK_VERSION	((uint32_t)4)
 
 #ifndef US_CFG_MEMSINK_MAX_DATA
 #	define US_CFG_MEMSINK_MAX_DATA 33554432
@@ -51,6 +51,7 @@ typedef struct {
 	unsigned	stride;
 	bool		online;
 	bool		key;
+	unsigned	gop;
 
 	long double	grab_ts;
 	long double	encode_begin_ts;
diff --git a/src/ustreamer/m2m.c b/src/ustreamer/m2m.c
index cb5e42b..0add7c1 100644
--- a/src/ustreamer/m2m.c
+++ b/src/ustreamer/m2m.c
@@ -476,6 +476,7 @@ static int _m2m_encoder_compress_raw(us_m2m_encoder_s *enc, const us_frame_s *sr
 			} else {
 				us_frame_set_data(dest, _RUN(output_bufs[output_buf.index].data), output_plane.bytesused);
 				dest->key = output_buf.flags & V4L2_BUF_FLAG_KEYFRAME;
+				dest->gop = enc->gop;
 				done = true;
 			}