I only use my screen saver at work for security, to lock my screen when I'm away from my desk. I want to have a little fun and have it play a video, but I've hit a brick wall as to how to make it happen.

Xscreensaver works fine with an entry like:
"Test" plaympeg --fullscreen "Breaking the Habit.mpeg" \n\

and I understood from a bit of google'ing that creating the following videos.desktop file in my home directory under:
.local/share/applications/screensavers/

should be the equivalent.

cat .local/share/applications/screensavers/videos.desktop

[Desktop Entry]
Encoding=UTF-8
Name=Videos
Domment=Videos
Exec=plaympeg --fullscreen "/usr/local/share/music/Linkin Park/Breaking the Habit/Breaking the Habit.mpeg"
StartupNotify=false
Terminal=false
Type=Application
Categories=GNOME;Screensaver

"Videos" shows up in the list, but I just get a blank screen when I try to preview it. Has anyone got anything similar to work? Any suggestions or advice on how to debug this further gratefully accepted.