gboolean gst_element_seek_simple (GstElement *element, GstFormat format, GstSeekFlags seek_flags, gint64 seek_pos); gboolean gst_element_seek (GstElement *element, gdouble rate, GstFormat format, GstSeekFlags flags, GstSeekType cur_type, gint64 cur, GstSeekType stop_type, gint64 stop);
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