Several KDE project have their own version of FindFFmpeg. These are: kfilemetadata, kdelibs4support, ffmpegthumbs, k3b, krita, digikam, amarok, kid3 and subtitlecomposer A canonical source for those in ECM would be nice. There is a FindFFmpeg in attic, but it does not seem to be up to recent standards, e.g. it does not provide imported targets
A possibly relevant merge request was started @ https://invent.kde.org/frameworks/extra-cmake-modules/-/merge_requests/509