VP9 video wrong colours when converted to RGB
From https://gitlab.gnome.org/GNOME/totem/-/issues/571
Thumbnailing this video generates a preview in the wrong colours as per the screenshot:
Tested with GStreamer 1.21.90 using totem's development Flatpak.
The code to do the colour conversion is at: https://gitlab.gnome.org/GNOME/totem/-/blob/master/src/gst/totem-gst-pixbuf-helpers.c