A gchar is not a string.
https://bugzilla.gnome.org/show_bug.cgi?id=775944
/**
* gst_event_new_select_streams:
- * @streams: (element-type gchar) (transfer none): the list of streams to
+ * @streams: (element-type utf8) (transfer none): the list of streams to
* activate
*
* Allocate a new select-streams event.
/**
* gst_event_parse_select_streams:
* @event: The event to parse
- * @streams: (out) (element-type gchar) (transfer full): the streams
+ * @streams: (out) (element-type utf8) (transfer full): the streams
*
* Parse the SELECT_STREAMS event and retrieve the contained streams.
*