OK, I digged a bit more and I found out how thumbnails get generated.
The thumbnailer registered for the files (or at least some that I tried)
is "/usr/bin/gnome-video-thumbnailer -s %s %u %o", which looks OK. I
tried running it by hand with
/usr/bin/gnome-video-thumbnailer -s 128 '/media/testfile.avi' output.png
(which seems to be the correct way) and I got
************
(process:21395): GStreamer-WARNING **: The GStreamer function
gst_init_get_option_group() was
called, but the GLib threading system has not been initialised
yet, something that must happen before any other GLib function
is called. The application needs to be fixed accordingly, please
file a bug against this application.
GThread-ERROR **: GThread system may only be initialized once.
aborting...
Aborted (core dumped)
************
If you need the core dump, please tell me where I can find it, I never
knew where they are placed.
** Summary changed:
- video thumbnails no longer work
+ gnome-video-thumbnailer started to crash
--
gnome-video-thumbnailer started to crash
https://launchpad.net/bugs/80758
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