oech3 [1] filed a deletion request for opera-extras [2]: Unfortunately, /usr/lib/opera/lib_extra is no longer high priority. So this package is broken. We need to ask maintainer of opera to replace /usr/lib/opera/libffmpeg.so directly.
[1] https://aur.archlinux.org/account/oech3/ [2] https://aur.archlinux.org/pkgbase/opera-extras/
