MarsSeed [1] filed a deletion request for libplacebo4.208 [2]: Unbuildable, unused, unneeded package. See my comments on mpv-caca page, as well as the deletion request for the latter (PRQ#49369).
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/libplacebo4.208/
