diff --git a/include/gui.h b/include/gui.h
--- /dev/null
+++ b/include/gui.h
@@ -0,0 +1,10 @@
+#ifndef __GUI_H__
+#define __GUI_H__
+
+#include<gst/gst.h>
+
+int set_duration (gint64,gint64);
+void exit_application();
+void init_gui (int *, char ***, GstElement *);
+
+#endif