Comment 12 for bug 97251

as a more permanent workaround, one could rename /usr/bin/totem and place a script in its place, that disables the screensaver when totem is run.. such as the following (it's really simple, i'm sure there's a better way):

#!/bin/bash
# Assuming totem was renamed totem1, waits for gnome-screensaver to be killed, opens totem and waits for exit, then it runs the screensaver again
killall gnome-screensaver && totem1 $@ ; gnome-screensaver