GStreamer tags are typed and the correct type must be used when inserting a value into a GstTagList or subsequent merges or data accesses can crash because of invalid casts. Found while adding additional mappings for GPS values. Change-Id: I95ab40a480a4685bf4e69064315557faa9de288e Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>