MarsSeed [1] filed a deletion request for gpac-headless [2]: Abandoned, broken VCS package in disguise from 2019. Never updated, was a one-time effort.
Arch repo has gpac, and AUR carries a proper gpac-git. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/gpac-headless/
