static void gstCBunknownType(GstElement *decodebin, GstPad *pad, GstCaps *l, gpointer data);
static void gstCBsubtitleAvail(GstElement *element, GstBuffer *buffer, GstPad *pad, gpointer user_data);
static void gstCBsubtitlePadEvent(GstPad *pad, GstEvent *event, gpointer user_data);
static void gstCBunknownType(GstElement *decodebin, GstPad *pad, GstCaps *l, gpointer data);
static void gstCBsubtitleAvail(GstElement *element, GstBuffer *buffer, GstPad *pad, gpointer user_data);
static void gstCBsubtitlePadEvent(GstPad *pad, GstEvent *event, gpointer user_data);