why gst_x_overlay_set_render_rectangle don't work

[LIDE]

I have problem with video render function gst_x_overlay_set_render_rectangle.
It returns TRUE,but have no 
effect.The video plays in the full window app->win not my set render
rectangle.how to render video in the tectangle I set in the window?? sorry
with my poor English.
typedef struct _App
{
	GstElement *playbin; 
	GstElement *appsrc;	GstElement *xvimagesink;
	GMainLoop *loop;
	guint sourceid;
	guint8 *data;
	gsize length;
	guint64 offset;
	int fds[2];
	Display     *disp;
	Window      win;
}App;



typedef struct Rect{
	int x;
	int y; 
    int width;
	int height;
}Rect;

static GstBusSyncReply create_window (GstBus * bus, GstMessage * message,
GstPipeline * pipeline)
{
	if (GST_MESSAGE_TYPE (message) != GST_MESSAGE_ELEMENT)
		return GST_BUS_PASS;
	
	if (!gst_structure_has_name (message->structure, "prepare-xwindow-id"))
		return GST_BUS_PASS;
	App *app = (App*) pipeline;
//	GstXOverlay *overlay = GST_X_OVERLAY(app->xvimagesink);
	GstXOverlay *overlay = GST_X_OVERLAY(GST_MESSAGE_SRC (message));
	//app->xvimagesink = overlay;

	//app->disp = XOpenDisplay(getenv("DISPALY"));
	app->disp = XOpenDisplay(NULL);
	Window win2;
	XSync (app->disp, FALSE);
	app->win = XCreateSimpleWindow (app->disp, XDefaultRootWindow(app->disp),
0, 0, 1440, 900, 0, 0, 0);
	XMapRaised (app->disp, app->win);
	//g_object_set (app->xvimagesink, "force-aspect-ratio", TRUE, NULL);
	gst_x_overlay_set_window_handle (overlay, app->win);
#if 1
	gboolean ret;
	ret = gst_x_overlay_set_render_rectangle (overlay, 0, 0, 600,400);
	if(ret)
		printf("gst_x_overlay_set_render_rectangle success!!!\n");
	g_object_set (G_OBJECT (GST_MESSAGE_SRC(message)), "force-aspect-ratio",
TRUE, NULL);
	gst_x_overlay_expose(overlay);
#endif	
	gst_message_unref (message);

	return GST_BUS_DROP;
}



static gboolean
bus_message (GstBus * bus, GstMessage * message, App * app)
{
	GST_DEBUG ("got message %s",
			gst_message_type_get_name (GST_MESSAGE_TYPE (message)));

	switch (GST_MESSAGE_TYPE (message)) {
		case GST_MESSAGE_ERROR:
			g_error ("received error");
			g_main_loop_quit (app->loop);
			break;
#if 0
		case GST_MESSAGE_ELEMENT:
			if(gst_structure_has_name(message->structure,
						"prepare-xwindow-id"))
			{
				GstXOverlay *xoverlay = NULL;
				xoverlay = GST_X_OVERLAY (GST_MESSAGE_SRC (message));
				app->disp = XOpenDisplay(NULL);
				app->win = XCreateSimpleWindow (app->disp,
XDefaultRootWindow(app->disp), 0, 0, 1440, 900, 0, 0, 0);
				//XMapWindow(app->disp, app->win);
				XMapRaised (app->disp, app->win);
				XSync (app->disp, FALSE);
				gst_x_overlay_set_window_handle(xoverlay, app->win);
//				gst_x_overlay_handle_events (xoverlay, FALSE);
				if(gst_x_overlay_set_render_rectangle(xoverlay,
						20,
						20,
						600,
						400))
					printf("render success\n\n");
				gst_x_overlay_expose(xoverlay);
			}
			GstElement *element = GST_ELEMENT (GST_MESSAGE_SRC (message));
			if (g_object_class_find_property (G_OBJECT_GET_CLASS (element),
						"force-aspect-ratio")) {
				printf("force-aspect-ratio\n");
				g_object_set (element, "force-aspect-ratio", TRUE, NULL);
			}

			break;
#endif
		case GST_MESSAGE_EOS:
				/*g_error ("streamer eos");*/
				printf("=====>get eos\n");
				g_main_loop_quit (app->loop);

				break;
		default:
				break;
	}
	return TRUE;
}


static void p_gst_init(void)
{
	App *app = &s_app;
	pipe(app->fds);
	GError *error = NULL;
	GstBus *bus;

	gst_init (NULL, NULL);

	/* create a mainloop to get messages */
	app->loop = g_main_loop_new (NULL, TRUE);

	app->playbin = gst_element_factory_make ("playbin2", NULL);
	g_assert (app->playbin);

	bus = gst_pipeline_get_bus (GST_PIPELINE (app->playbin));

	/* add watch for messages */
	gst_bus_add_watch (bus, (GstBusFunc) bus_message, app);
//	gst_bus_set_sync_handler(bus, (GstBusSyncHandler)create_window,
app->playbin);

	/* set to read from appsrc */
	g_object_set (app->playbin, "uri", "appsrc://", NULL);	
	app->xvimagesink = gst_element_factory_make ("xvimagesink", NULL);
	g_object_set (app->playbin, "video-sink", app->xvimagesink, NULL);
	gst_object_unref (bus);

	/* get notification when the source is created so that we get a handle to
it
	 * and can configure it */
	g_signal_connect (app->playbin, "deep-notify::source",
			(GCallback) found_source, app);

    return ;
}




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