/usr/lib/x86_64-linux-gnu/libmpv.so is in libmpv-dev 0.6.2-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libmpv.so.1.5.0
/usr/lib/x86_64-linux-gnu/libmpv.so.1.5.0