FS-8317 #resolve [Playing stacked video files sometimes makes the floor layer unusable]

src/mod/applications/mod_conference/conference_file.c

@@ -56,6 +56,11 @@ switch_status_t conference_file_close(conference_obj_t *conference, conference_f
 		switch_event_add_header(event, SWITCH_STACK_BOTTOM, "milliseconds", "%ld", (long) node->fh.samples_in / (node->fh.native_rate / 1000));
 		switch_event_add_header(event, SWITCH_STACK_BOTTOM, "samples", "%ld", (long) node->fh.samples_in);
 
+		if (node->layer_id && node->layer_id > -1) {
+			if (node->canvas_id < 0) node->canvas_id = 0;
+			conference_video_canvas_del_fnode_layer(conference, node);
+		}
+
 		if (node->fh.params) {
 			switch_event_merge(event, node->fh.params);
 		}

src/mod/applications/mod_conference/conference_video.c

@@ -1380,8 +1380,8 @@ void conference_video_canvas_set_fnode_layer(mcu_canvas_t *canvas, conference_fi
 		if (canvas->layout_floor_id > -1) {
 			idx = canvas->layout_floor_id;
 			xlayer = &canvas->layers[idx];
-
-			if (xlayer->fnode) {
+			
+			if (xlayer->fnode && xlayer->fnode != fnode) {
 				idx = -1;
 			}
 		}