Spotted by Jiri Uncovsky.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1336>
video_sink = gst_element_get_static_pad (GST_ELEMENT (overlay), "video_sink");
overlay->orig_video_event = GST_PAD_EVENTFUNC (video_sink);
gst_pad_set_event_function (video_sink, gst_time_overlay_video_event);
video_sink = gst_element_get_static_pad (GST_ELEMENT (overlay), "video_sink");
overlay->orig_video_event = GST_PAD_EVENTFUNC (video_sink);
gst_pad_set_event_function (video_sink, gst_time_overlay_video_event);
+ gst_object_unref (video_sink);