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