From looking at the "strace -f" output for vlc, it appears that xdg-screensaver is being called, but ends with "xscreensaver-command: no screens". Then gnome-screensaver-command is used next then.
From looking at the "strace -f" output for vlc, it appears that xdg-screensaver is being called, but ends with "xscreensaver- command: no screens". er-command is used next then.
Then gnome-screensav