It is indeed a packaging problem, on the Ubuntu side of things.
gstreamer1.0-gtk3 is in universe, whereas libreoffice-avmedia-backend-gstreamer is in main, so the former cannot be made a direct/recommended dependency of the latter, per Ubuntu policy.
Thanks for the report Gašper.
It is indeed a packaging problem, on the Ubuntu side of things.
gstreamer1.0-gtk3 is in universe, whereas libreoffice- avmedia- backend- gstreamer is in main, so the former cannot be made a direct/recommended dependency of the latter, per Ubuntu policy.