The GUI program is called ghb
. I assume, Debian maintainer renames the executable or creates a symlink with a more reasonable name, as Solus just packages the files which are installed with make install
.
Edit: Yes, that's the case. Debian package also contains /usr/bin/handbrake
and /usr/bin/handbrake-gtk
symlinks, which both point to /usr/bin/ghb
.