arpi at thot.banki.hu
Thu Oct 18 12:24:20 CEST 2001
> > 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.
I also thought the same first. But if I ignore delays, and force fps
to be 24, i still get out of sync.for many vobs fps about 25-26 is ok,
and for some it's totally variable.
I'll make more measurements.
A'rpi / Astral & ESP-team
mailto:arpi at thot.banki.hu
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