[gthumb] gstreamer: do not crash when using hardware acceleration for videos

[Paolo Bacchilega <paobac src gnome org>]

commit 971db8ea825dbf980e844734efc5fa1158dcf727
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Fri May 21 09:14:02 2021 +0200

    gstreamer: do not crash when using hardware acceleration for videos

 gthumb/main.c | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/gthumb/main.c b/gthumb/main.c
index a754d758..c8add34c 100644
--- a/gthumb/main.c
+++ b/gthumb/main.c
@@ -21,6 +21,9 @@
 
 #include <config.h>
 #include <gtk/gtk.h>
+#ifdef GDK_WINDOWING_X11
+#include <X11/Xlib.h>
+#endif
 #include "gth-application.h"
 #include "gth-main.h"
 #include "gth-window.h"
@@ -49,6 +52,11 @@ main (int argc, char *argv[])
        bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
        textdomain (GETTEXT_PACKAGE);
 
+#if defined (HAVE_GSTREAMER) && defined (GDK_WINDOWING_X11)
+       /* https://discourse.gnome.org/t/how-to-correctly-init-gtk-app-with-gstreamer/5105/3 */
+       XInitThreads();
+#endif
+
        /* run the main application */
 
        Main_Application = gth_application_new ();