I've applied some patches from the official tracker repo.
The most notable one being to prefer ID3v2 tags to ID3v1 tags.

It's based on the latest tracker in CSSU.

There are more upstream patches that could be applied but it gets confusing at this commit:
https://git.gnome.org/browse/tracker...05ecd2bd90c2bd
(This commit also breaks a bunch of closed source apps)

Link to source:
https://www.dropbox.com/s/3zgsne52nj...er.tar.gz?dl=0

Patches applied:
https://git.gnome.org/browse/tracker...4fbdea1a75e44a
https://git.gnome.org/browse/tracker...74d3ddcfb900b0
https://git.gnome.org/browse/tracker...00e7d574a50c1c
https://git.gnome.org/browse/tracker...f3d6be861d92da

Is there any interest in upgrading tracker?