/usr/lib/x86_64-linux-gnu/libmpeg2.so is in libmpeg2-4-dev 0.5.1-7.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libmpeg2.so.0.1.0
/usr/lib/x86_64-linux-gnu/libmpeg2.so.0.1.0