diff --git a/src/include/switch_core_media.h b/src/include/switch_core_media.h
index acfb770a19..014f3d0c51 100644
--- a/src/include/switch_core_media.h
+++ b/src/include/switch_core_media.h
@@ -314,6 +314,11 @@ SWITCH_DECLARE(void) switch_core_media_end_video_function(switch_core_session_t
 SWITCH_DECLARE(switch_status_t) switch_core_session_start_video_thread(switch_core_session_t *session);
 SWITCH_DECLARE(int) switch_core_media_check_video_function(switch_core_session_t *session);
 SWITCH_DECLARE(void) switch_core_session_video_reinit(switch_core_session_t *session);
+SWITCH_DECLARE(switch_status_t) switch_core_media_read_lock_unlock(switch_core_session_t *session, switch_media_type_t type, switch_bool_t lock);
+
+#define switch_core_media_read_lock(_s, _t) switch_core_media_read_lock_unlock(_s, _t, SWITCH_TRUE) 
+#define switch_core_media_read_unlock(_s, _t) switch_core_media_read_lock_unlock(_s, _t, SWITCH_FALSE)
+
 
 SWITCH_END_EXTERN_C
 #endif
diff --git a/src/mod/applications/mod_conference/mod_conference.c b/src/mod/applications/mod_conference/mod_conference.c
index afb74bf33b..9b4774369e 100644
--- a/src/mod/applications/mod_conference/mod_conference.c
+++ b/src/mod/applications/mod_conference/mod_conference.c
@@ -2922,13 +2922,17 @@ static void *SWITCH_THREAD_FUNC conference_video_thread_run(switch_thread_t *thr
 	int want_refresh = 0;
 	int yield = 0;
 	switch_core_session_t *session;
-	char buf[65536];
+	//char buf[65536];
 	conference_member_t *floor_holder = NULL;
+	int locked = 0;
 
 	conference->video_running = 1;
 	switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Video thread started for conference %s\n", conference->name);
 
 	while (conference->video_running == 1 && globals.running && !switch_test_flag(conference, CFLAG_DESTRUCT)) {
+		locked = 0;
+		session = NULL;
+		
 		if (yield) {
 			switch_yield(yield);
 			yield = 0;
@@ -2957,10 +2961,15 @@ static void *SWITCH_THREAD_FUNC conference_video_thread_run(switch_thread_t *thr
 
 		if ((status = switch_core_session_read_lock(session)) == SWITCH_STATUS_SUCCESS) {
 			switch_mutex_unlock(conference->mutex);
-			if (!switch_channel_ready(switch_core_session_get_channel(session))) {
-				status = SWITCH_STATUS_FALSE;
+			if ((switch_core_media_read_lock(session, SWITCH_MEDIA_TYPE_VIDEO) == SWITCH_STATUS_SUCCESS)) {
+				locked = 1;
+				if (!switch_channel_ready(switch_core_session_get_channel(session))) {
+					status = SWITCH_STATUS_FALSE;
+				} else {
+					status = switch_core_session_read_video_frame(session, &vid_frame, SWITCH_IO_FLAG_NONE, 0);
+				}
 			} else {
-				status = switch_core_session_read_video_frame(session, &vid_frame, SWITCH_IO_FLAG_NONE, 0);
+				status = SWITCH_STATUS_FALSE;
 			}
 			switch_mutex_lock(conference->mutex);
 			switch_core_session_rwunlock(session);
@@ -2976,7 +2985,7 @@ static void *SWITCH_THREAD_FUNC conference_video_thread_run(switch_thread_t *thr
 			goto do_continue;
 		}
 
-		memcpy(buf, vid_frame->packet, vid_frame->packetlen);
+		//memcpy(buf, vid_frame->packet, vid_frame->packetlen);
 		
 		switch_mutex_unlock(conference->mutex);
 		switch_mutex_lock(conference->mutex);
@@ -3002,7 +3011,7 @@ static void *SWITCH_THREAD_FUNC conference_video_thread_run(switch_thread_t *thr
 			}
 
 			if (isession && switch_channel_test_flag(ichannel, CF_VIDEO)) {
-				memcpy(vid_frame->packet, buf, vid_frame->packetlen);
+				//memcpy(vid_frame->packet, buf, vid_frame->packetlen);
 				switch_core_session_write_video_frame(imember->session, vid_frame, SWITCH_IO_FLAG_NONE, 0);
 			}
 
@@ -3032,6 +3041,12 @@ static void *SWITCH_THREAD_FUNC conference_video_thread_run(switch_thread_t *thr
 		}
 
 	do_continue:
+
+		if (session && locked) {
+			switch_core_media_read_unlock(session, SWITCH_MEDIA_TYPE_VIDEO);
+			locked = 0;
+		}
+
 		switch_mutex_unlock(conference->mutex);
 	}
 
diff --git a/src/mod/codecs/mod_vpx/mod_vpx.c b/src/mod/codecs/mod_vpx/mod_vpx.c
index 2dab2edd8e..f68d86e5de 100644
--- a/src/mod/codecs/mod_vpx/mod_vpx.c
+++ b/src/mod/codecs/mod_vpx/mod_vpx.c
@@ -74,6 +74,7 @@ struct vpx_context {
 	uint8_t decoder_init;
 	switch_buffer_t *vpx_packet_buffer;
 	int got_key_frame;
+	int key_count;
 	switch_size_t last_received_timestamp;
 	switch_bool_t last_received_complete_picture;
 	int need_key_frame;
@@ -479,6 +480,7 @@ static switch_status_t buffer_vpx_packets(vpx_context_t *context, switch_frame_t
 
 		if (is_keyframe && !context->got_key_frame) {
 			context->got_key_frame = 1;
+			context->key_count = 0;
 		}
 	}
 
@@ -529,9 +531,9 @@ static switch_status_t switch_vpx_decode(switch_codec_t *codec, switch_frame_t *
 
 	len = switch_buffer_inuse(context->vpx_packet_buffer);
 
-	if (frame->m && (status != SWITCH_STATUS_SUCCESS || !len)) {
-		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "WTF????? %d %ld\n", status, len);
-	}
+	//if (frame->m && (status != SWITCH_STATUS_SUCCESS || !len)) {
+		//switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "WTF????? %d %ld\n", status, len);
+	//}
 
 
 	if (status == SWITCH_STATUS_SUCCESS && frame->m && len) {
@@ -572,11 +574,6 @@ static switch_status_t switch_vpx_decode(switch_codec_t *codec, switch_frame_t *
 
 end:
 
-	if (status == SWITCH_STATUS_NOTFOUND) {
-		switch_buffer_zero(context->vpx_packet_buffer);
-		switch_set_flag(frame, SFF_WAIT_KEY_FRAME);
-	}
-
 	if (status == SWITCH_STATUS_RESTART) {
 		context->got_key_frame = 0;
 		switch_buffer_zero(context->vpx_packet_buffer);
@@ -589,9 +586,12 @@ end:
 	}
 
 	if (!context->got_key_frame) {
-		switch_set_flag(frame, SFF_WAIT_KEY_FRAME);
+		if (!(context->key_count++ % 20)) {
+			switch_set_flag(frame, SFF_WAIT_KEY_FRAME);
+		}
 	}
 
+
 	return status;
 }
 
diff --git a/src/switch_core_media.c b/src/switch_core_media.c
index c92b2242b0..783e32c3be 100644
--- a/src/switch_core_media.c
+++ b/src/switch_core_media.c
@@ -1786,6 +1786,50 @@ static void check_jb(switch_core_session_t *session, const char *input)
 
 }
 
+//?
+SWITCH_DECLARE(switch_status_t) switch_core_media_read_lock_unlock(switch_core_session_t *session, switch_media_type_t type, switch_bool_t lock)
+{
+	switch_rtp_engine_t *engine;
+	switch_media_handle_t *smh;
+
+	switch_assert(session);
+
+	if (!(smh = session->media_handle)) {
+		return SWITCH_STATUS_FALSE;
+	}
+
+	if (!smh->media_flags[SCMF_RUNNING]) {
+		return SWITCH_STATUS_FALSE;
+	}
+
+	engine = &smh->engines[type];
+
+	if (!engine->read_codec.implementation || !switch_core_codec_ready(&engine->read_codec)) {
+		return SWITCH_STATUS_FALSE;
+	}
+
+	switch_assert(engine->rtp_session != NULL);
+
+
+	if (!switch_channel_up_nosig(session->channel) || !switch_rtp_ready(engine->rtp_session) || switch_channel_test_flag(session->channel, CF_NOT_READY)) {
+		return SWITCH_STATUS_FALSE;
+	}
+
+	if (lock) {
+		if (engine->read_mutex[type] && switch_mutex_trylock(engine->read_mutex[type]) != SWITCH_STATUS_SUCCESS) {
+			/* return CNG, another thread is already reading  */
+			switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG1, "%s is already being read for %s\n", 
+							  switch_channel_get_name(session->channel), type2str(type));
+			return SWITCH_STATUS_INUSE;
+		}
+	} else {
+		switch_mutex_unlock(engine->read_mutex[type]);
+	}
+
+	return SWITCH_STATUS_SUCCESS;
+}
+
+
 //?
 SWITCH_DECLARE(switch_status_t) switch_core_media_read_frame(switch_core_session_t *session, switch_frame_t **frame,
 															 switch_io_flag_t flags, int stream_id, switch_media_type_t type)
@@ -9627,6 +9671,7 @@ SWITCH_DECLARE(switch_status_t) switch_core_session_write_video_frame(switch_cor
 
 	write_frame = *frame;
 	frame = &write_frame;
+	frame->img = img;
 
 	if (!switch_test_flag(frame, SFF_USE_VIDEO_TIMESTAMP)) {