oech3 [1] filed a deletion request for vivaldi-update-ffmpeg-hook [2]: Current vivaldi automatically DL $HOME/.local/lib/vivaldi/media- codecs-7.5/libffmpeg.so if aac and h264 are unavaiable. So we can see h264 videos without this. Both method use completely same libffmpeg.so binary . [1] https://aur.archlinux.org/account/oech3/ [2] https://aur.archlinux.org/pkgbase/vivaldi-update-ffmpeg-hook/