gstreamer/gstreamer-sharp/Debug.custom

    [DllImport("gstreamer-0.10.dll")]
    static extern void gst_debug_set_default_threshold(Gst.DebugLevel debug_level);

    public static void SetDefaultThreshold(Gst.DebugLevel debug_level)
    {
        gst_debug_set_default_threshold(debug_level);
    }