Kjetil Torgrim Homme
kjetilho at linpro.no
Thu Oct 18 02:00:14 CEST 2001
Arpi <arpi at thot.banki.hu> writes:
> Steven M. Schultz writes:
> > Did you mean 23.97 (NTSC 3:2 pulldown converted FILM) fps? That
> > is rather uncommon - most material I have seen is 29.97fps.
> no! I mean that so-called progressive mpeg2 files, where the actual
> coded fps is less than nominal fps (header value). mpeg2 headers has
> 3 bit for signing frame delaying, up to 3 frame times. about the
> half of my .vob files uses these. the header says it's a 29.97 fps
> movie, but if you read frames from the file, you'll cound only 24-26
> frames per sec. but some of these frames is flagged to be delayed so
> the total time of these frames is 29.97 frame time per sec.
This is 3:2 pulldown -- alternately every 3rd and 2nd frame is delayed
to convert 24 fps (film) into 30 fps (NTSC). You should just ignore
the delays and convert it back into 24 fps, since 3:2 pulldown makes
for stuttering motions compared to the film original.
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