Posted by The Kwizatz Haderach on 09/03/05 10:23

Ridwan Hughes wrote:

> Usually when they put a film onto PAL DVD they playback the video at
> 25fps instead of 24fps and speed up the audio to match, occasionally they
> framerate convert from 24 to 25 and the audio is played back at normal
> speed, the result is the film looks "ok" on a regular tv but bad on a
> computer because the footage is 50fps interlaced and not 25fps
> progressive.

Is it even correct to say 50 frames per second though? The film would be
over in half the time! Granted PAL is 50Hz, so one half of a frame
(field) is shown every 50th of a second, giving you 25 'complete' images
per second (25fps). I'm sure you know this though. PAL DVDs still play
back at 25fps regardless of whether they're interlaced or progressive.
Just curious.

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