/usr/lib/x86_64-linux-gnu/libfaad.so is in libfaad-dev 2.7-8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libfaad.so.2.0.0
/usr/lib/x86_64-linux-gnu/libfaad.so.2.0.0