FabioLolix [1] filed a deletion request for ffmpeg4.0 [2]: One time effort on 2019-01-15, configured to install in /usr, it provide and conflicts ffmpeg, any package that use ffmpeg from official repo will fail to start with this [1] https://aur.archlinux.org/account/FabioLolix/ [2] https://aur.archlinux.org/pkgbase/ffmpeg4.0/