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Old 29th October 2011, 10:19   #5  |  Link
madhatter300871
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Join Date: Nov 2005
Posts: 255
My projector can do 1024x768 @ 72Hz, but who wants to play a HD movie at 1024x768 !! My PC will scale it down to 1024x768 then the projector will scale it back up to 1280x720 (native resolution).

Am I correct in assuming the following :-

1. Movies can be presented at any frame rate but the most common ones are 23.976p, 24p, 25p, 29.97p, 30p, 50i, 60i
2. Movies can be presented in any resolution, but the most common commercial ones are (PAL) 720x576, 1280x720, 1920x1080
3. Displays can be capable of accepting many refresh rates, but the most common ones are 24Hz, 50Hz, 60Hz. (Also many more for PC connection).
4. For 100% smooth playback with no judder the movie frame rate MUST be a multiple of the display refresh rate.

Question : When a display has 24p support, does this mean 24p or 23.976p. If it means 24p, will 23.976p movies judder (and vice versa).

Question : If I do set my projector to 1024x768@72Hz, will my 23.976fps movie judder (its not 24p is it, so its not an exact multiple of 72).
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