/usr/share/doc/gmerlin-plugins-base/changelog.Debian.gz is in gmerlin-plugins-base 1.2.0~dfsg+1-6.1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gmerlin-plugins-base/../libgmerlin0/changelog.Debian.gz