ok, there IS a lot of confusion about HD even among professionals.
imagine what the CONSUMERS are going through.
24P is NOT 1080i. if anything you should refer to it as 1080P/24fps
(or 23.98fps)
now that isn't to be confused with those 24p dvc pro cameras that
capture at 24 fps and add pulldown in the camera, because those tapes
end up as 29.97fps NTSC
david friedman
On 8/28/05, tony(at)hdheaven.co.uk <tony(at)hdheaven.co.uk> wrote:
> Hi Guys,
>
> Surely the "i" at the end of 1080i means "Interlaced" doesn't it? Which
> would differentiate it, for instance from 1080PsF.
>
> In other words, 1080 specifies the line count, i means interlaced, and
> then other information is requred to specify frame rate?
>
> So, 24P couldn't be called 1080i.
>
> Or have I completely misundertood something here?
>
> Cheers,
> Tone :)
>
>
> >
> > Mathew Sherman wrote:
> >
> >> Yet again I must remind everyone that saying "1080i" does not have
> >> anything to do with frame rate. People are getting confused when
> >> people tell them "we need 1080i" that it somehow precludes them from
> >> working at 24PsF. But the only thing truly that 1080i means (in this
> >> case I am referring to the HDNet spec) is that they do not want 720P
> >> originals. Sony HDCAM is a 1080i format regardless of what frame rate
> >> you are using. 24P is also 1080i and that is exactly what HDNet means.
> >> They don't like DVCPRO-HD since it's low bit rate (100Mbps) and is a
> >> 720P format (natively).
> >>
> >> In terms of what to do for a possible film-out well definitely working
> >> progressive will help the film look better, however these days there
> >> are such good de-interlacing tools that I bet one would have a hard
> >> time telling the difference between 59.94i (proper term) or 23.976PsF
> >> on the cinema screen once all is said and done, properly.
> >>
> > Sorry to disagree Matt but in the US 1080i has become synonymous with
> > 59.94 fields. Mark Cuban was involved in a discussion on the Telecine
> > Internet Group last year on this topic. He was quite adamant that the
> > research they've done on viewer preferences were so strongly in favor of
> > the higher frame rate that they chose to require that for delivery. I'm
> > not surprised since Mark Cuban is so involved with sports broadcasting
> > and the higher temporal resolution makes a difference. I happen to
> > prefer 720p for sports for the same reason - disclaimer: I'm ex-ABC
> > engineering.
> > If you're planning a film out there is a big advantage to working in 24p
> > (again, common usage in the US translates to 1080psf(at)23.97 - even for
> > film jobs you'd need to specify true 24p if you didn't want 23.97psf!).
> > Yes, there are de-interlace tools but it doesn't look the same and we've
> > been through it on numerous projects.
> >
> > --
> > Richard Torpey
> > VP Engineering
> > Rhinoceros/MultiVideo Group
> > 50 East 42 Street
> > New York, NY 10017
> > (212) 986-1577
> > (212) 986-3833 fax
> > (212) 692-4465 direct
> >
> >
> >
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