/usr/share/doc/mencoder/changelog.Debian.gz is in mencoder 2:1.1+dfsg1-0ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/mencoder/../mplayer/changelog.Debian.gz
/usr/share/doc/mencoder/../mplayer/changelog.Debian.gz