/usr/lib/x86_64-linux-gnu/libmp4v2.so.2 is in libmp4v2-2 2.0.0~dfsg0-6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libmp4v2.so.2.0.0
/usr/lib/x86_64-linux-gnu/libmp4v2.so.2.0.0