/usr/share/applications/screensavers/vidwhacker.desktop is in xscreensaver-data-extra 5.15-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | [Desktop Entry]
Name=VidWhacker
Exec=/usr/lib/xscreensaver/vidwhacker -root
TryExec=/usr/lib/xscreensaver/vidwhacker
Comment=This is a shell script that grabs a frame of video from the system's video input, and then uses some PBM filters (chosen at random) to manipulate and recombine the video frame in various ways (edge detection, subtracting the image from a rotated version of itself, etc.) Then it displays that image for a few seconds, and does it again. This works really well if you just feed broadcast television into it. Written by Jamie Zawinski.
StartupNotify=false
Terminal=false
Type=Application
Categories=Screensaver;
OnlyShowIn=GNOME;
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