gboolean gst_segment_do_seek (GstSegment * segment, gdouble rate,
GstFormat format, GstSeekFlags flags,
GstSeekType start_type, guint64 start,
GstSeekType stop_type, guint64 stop, gboolean * update);
gboolean gst_segment_do_seek (GstSegment * segment, gdouble rate,
GstFormat format, GstSeekFlags flags,
GstSeekType start_type, guint64 start,
GstSeekType stop_type, guint64 stop, gboolean * update);