[Tracker] taglib usage

[lariamat <interflug1 gmx net>]

Hi all
I've got a indexing question. I am writing a application that uses
taglib (http://developer.kde.org/~wheeler/taglib.html) and I found out
that tracker starts reindexing all my music files after taglib was
reading (!) all the tags. The files have not been changed. They were
just accessed to get id3, etc. data.
The last change times of the files are months in the past but tracker
thinks the files have to be reindexed. 
Is tracker looking at the access time or something else? If so, is there
a way to find out that the file wasn't changed? Or is the cpu load
produced just coming from that?
I am using tracker version 0.6.6 on ubuntu.
JÃrn