QuickTime makes display sleep, according to screen saver time

QuickTime 7.1, OS 10.4.6, PowerBook G4
My display sleep time is set for never, and my screen saver is set for 5 minutes. When I play a QuickTime movie, if I don't move the pointer once in a while, the display sleeps at 5 minutes. I could see QuickTime movies not informing the computer that something is going on, but in this case the screen saver should activate. Instead, the display simply sleeps.
Any idea what's going on?

Does not matter any more.

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