I deleted
.cache/gnome-desktop-thumbnailer
.cache/gstreamer-1.0
and rebooted.
After logging in
.cache/gstreamer-1.0/registry.x86_64.bin
is created.
After starting nautilus and going to a folder contaning media
.cache/gnome-desktop-thumbnailer/gstreamer-1.0/gstreamer-1.0.registry
is created.
Is there anything spcific I can check for in the registry?