There is probably an error in the basic tutorial 5 source code on this page:
https://gstreamer.freedesktop.org/documentation/tutorials/basic/toolkit-integration.html

There are three lines that have double commas:

controls = gtk_box_new (GTK_ORIENTATION_HORIZONTAL,, 0);

main_hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL,, 0);

main_box = gtk_box_new (GTK_ORIENTATION_VERTICAL,, 0);

From the GTK+ 3 documentation it is apparent that gtk_box_new only takes two arguments: https://developer.gnome.org/gtk3/stable/GtkBox.html#gtk-box-new

When the lines are edited only to have one comma each, I can get the example to build on Ubuntu 14.04, but get a runtime error:

State set to READY
 
(main:13018): Gtk-WARNING **: drawing failure for widget `GtkDrawingArea': NULL pointer
*** Error in `./main': double free or corruption (fasttop): 0x00000000012cdd00 ***
Aborted (core dumped)


On Antergos (Arch Linux) running in a VirtualBox VM I also get a runtime error after building the code with the commas corrected:

State set to READY
 
(main:1137): Gtk-WARNING **: drawing failure for widget 'GtkDrawingArea': NULL pointer
 
(main:1137): Gtk-WARNING **: drawing failure for widget 'GtkBox': NULL pointer
 
(main:1137): Gtk-WARNING **: drawing failure for widget 'GtkBox': NULL pointer
 
(main:1137): Gtk-WARNING **: drawing failure for widget 'GtkWindow': NULL pointer
main: cairo.c:305: cairo_destroy: Assertion `CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&cr->ref_count)' failed.
Aborted (core dumped)