MarsSeed [1] filed a deletion request for lib32-ffmpeg-compat [2]: 6 year old unmaintained package. I doubt many people need it at all. Also it is highly likely to be broken, as all the linked dependencies are up-to-date and not the 6-year-old versions of them.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/lib32-ffmpeg-compat/
