The latest GstreamerSDK and gst_x_overlay_set_window_handle (ubuntu)

[lightydo]

as per  Sebastian Dröge-7 suggestion, reading 
http://gstreamer.freedesktop.org/data/doc/gstreamer/0.10.36/gst-plugins-base-libs/html/gst-plugins-base-libs-gstxoverlay.html
<http://gstreamer.freedesktop.org/data/doc/gstreamer/0.10.36/gst-plugins-base-libs/html/gst-plugins-base-libs-gstxoverlay.html> 
, I added "gtk_widget_realize (video_window);" at the end of  create_ui () 
to resolve the issue. 


static void create_ui (CustomData *data) {
  GtkWidget *main_window;  /* The uppermost window, containing all other
windows */
  GtkWidget *video_window; /* The drawing area where the video will be shown
*/
  GtkWidget *main_box;     /* VBox to hold main_hbox and the controls */
  GtkWidget *main_hbox;    /* HBox to hold the video_window and the stream
info text widget */
  GtkWidget *controls;     /* HBox to hold the buttons and the slider */
  GtkWidget *play_button, *pause_button, *stop_button; /* Buttons */
  
  main_window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  g_signal_connect (G_OBJECT (main_window), "delete-event", G_CALLBACK
(delete_event_cb), data);
  
  video_window = gtk_drawing_area_new ();
  gtk_widget_set_double_buffered (video_window, FALSE);
  g_signal_connect (video_window, "realize", G_CALLBACK (realize_cb), data);
  g_signal_connect (video_window, "expose_event", G_CALLBACK (expose_cb),
data);
  
  play_button = gtk_button_new_from_stock (GTK_STOCK_MEDIA_PLAY);
  g_signal_connect (G_OBJECT (play_button), "clicked", G_CALLBACK (play_cb),
data);
  
  pause_button = gtk_button_new_from_stock (GTK_STOCK_MEDIA_PAUSE);
  g_signal_connect (G_OBJECT (pause_button), "clicked", G_CALLBACK
(pause_cb), data);
  
  stop_button = gtk_button_new_from_stock (GTK_STOCK_MEDIA_STOP);
  g_signal_connect (G_OBJECT (stop_button), "clicked", G_CALLBACK (stop_cb),
data);
  
  data->slider = gtk_hscale_new_with_range (0, 100, 1);
  gtk_scale_set_draw_value (GTK_SCALE (data->slider), 0);
  data->slider_update_signal_id = g_signal_connect (G_OBJECT (data->slider),
"value-changed", G_CALLBACK (slider_cb), data);
  
  data->streams_list = gtk_text_view_new ();
  gtk_text_view_set_editable (GTK_TEXT_VIEW (data->streams_list), FALSE);
  
  controls = gtk_hbox_new (FALSE, 0);
  gtk_box_pack_start (GTK_BOX (controls), play_button, FALSE, FALSE, 2);
  gtk_box_pack_start (GTK_BOX (controls), pause_button, FALSE, FALSE, 2);
  gtk_box_pack_start (GTK_BOX (controls), stop_button, FALSE, FALSE, 2);
  gtk_box_pack_start (GTK_BOX (controls), data->slider, TRUE, TRUE, 2);
  
  main_hbox = gtk_hbox_new (FALSE, 0);
  gtk_box_pack_start (GTK_BOX (main_hbox), video_window, TRUE, TRUE, 0);
  gtk_box_pack_start (GTK_BOX (main_hbox), data->streams_list, FALSE, FALSE,
2);
  
  main_box = gtk_vbox_new (FALSE, 0);
  gtk_box_pack_start (GTK_BOX (main_box), main_hbox, TRUE, TRUE, 0);
  gtk_box_pack_start (GTK_BOX (main_box), controls, FALSE, FALSE, 0);
  gtk_container_add (GTK_CONTAINER (main_window), main_box);
  gtk_window_set_default_size (GTK_WINDOW (main_window), 640, 480);
  
  gtk_widget_show_all (main_window);
  
*  gtk_widget_realize (video_window);*
}





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