preinst is in libav-tools 6:9.11-2ubuntu2.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!/bin/sh
set -e
# Automatically added by dh_installdeb
dpkg-maintscript-helper mv_conffile /etc/ffserver.conf /etc/avserver.conf 6:0.8.1-7 -- "$@" -- "$@"
# End automatically added section
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