FS-9267 fix regression

src/switch_core_media.c

@@ -11727,11 +11727,13 @@ SWITCH_DECLARE(switch_status_t) switch_core_session_read_video_frame(switch_core
 		}
 	}
 
+	if ((*frame)->codec) {
 		if (patchers) {
 			switch_set_flag((*frame)->codec, SWITCH_CODEC_FLAG_VIDEO_PATCHING);
 		} else {
 			switch_clear_flag((*frame)->codec, SWITCH_CODEC_FLAG_VIDEO_PATCHING);
 		}
+	}
 
 	if (status == SWITCH_STATUS_SUCCESS) {
 		switch_core_session_video_read_callback(session, *frame);