old: gst_player_set_position_update_interval
new: gst_player_config_set_position_update_interval
https://bugzilla.gnome.org/show_bug.cgi?id=769144
gdouble rate);
gdouble gst_player_get_rate (GstPlayer * player);
-void gst_player_set_position_update_interval (GstPlayer * player,
- guint interval);
-guint gst_player_get_position_update_interval (GstPlayer * player);
-
gchar * gst_player_get_uri (GstPlayer * player);
void gst_player_set_uri (GstPlayer * player,
const gchar * uri);