/usr/lib/libmp3splt/libsplt_mp3.so is in libmp3splt-dev 0.7.2-2ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libmp3splt/libsplt_mp3.so.0.0.0
/usr/lib/libmp3splt/libsplt_mp3.so.0.0.0