[Bug 779701] New: Failure to build Basic tutorial example 5 code as-is

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779701

            Bug ID: 779701
           Summary: Failure to build Basic tutorial example 5 code as-is
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: documentation
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: eduardas.m at fods.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

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)

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