/usr/lib/x86_64-linux-gnu/libsmpeg.so is in libsmpeg-dev 0.4.5+cvs20030824-7.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libsmpeg-0.4.so.0.1.4
/usr/lib/x86_64-linux-gnu/libsmpeg-0.4.so.0.1.4