Hz = Hertz = 1/s (1/sec) - "Hz" means in our case "pictures per second". Hence, the cinema picture is noticed to be fluent and without any flickering. With the double or triple refresh rate of 48 Hz or 72 Hz the human eye does not notice these black time intervals any longer. At 24 black time intervals per second we would notice a clear flickering. The canvas has to become black for a very short time between the film frames. For the intermittence a rotary shutter is responsible which is installed between source of light and film strip.įor us not noticing the movement of the film strip on the film reel In this moment the image will be shined through either twice or thrice - depending on the projector.
#Pal to ntsc dvd movie#
In old movie projectors the Maltese cross drive (which is in new models substituted with a step motor) is used to pause the film strip in front of the film gate for a short moment thus the projection of the image can happen. However, in the cinema the film is not played with 24 Hz. The film has a frame rate of 24 frames per second.
Motion picture films are shot in 24 fps (frames per second - full-images - progressive) usually on 35 mm film material.
#Pal to ntsc dvd code#
5.3 Video Time Code Counters, Drop Frame/Non Drop Frame.5.2 MPEG-2, T_F_F/R_F_F Flags, and FPS Flag.5.1 MPEG, Layer and Picturetypes - Sequence, Group Of Pictures (GOP), DCT, Run-Level VLC.
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