On Thu, 6 Jul 2006, stefan wrote:
> Hello Steven,
>
> have a nice holiday!
Thanks, I am!
> perfectly OK! So enjoy that little short-story below... :-) I could not
I've seen it before.
> How it came to that interlaced-video-bug (as far as I could get hands to
> the facts...)?
You were so close. Interlacing is not a bug as such. It was a
solution that addressed the limitations of the technology at the time.
> This is why I love to get rid of it... I *hate* interlacing... If he
Hate it all you want. Tilting at windmills provides good exercise :)
Please: do not think I *like* interlacing! I do not. It is a
legacy workaround visited upon us by the technology of 60 years ago.
BUT it exists and in the interest of not throwing away even more
information during the encoding process I prefer to leave interlaced
material interlaced.
If you were in an NTSC country you could also *hate* the .1%
difference from 30fps that came in with color TV, giving us 30000/1001
instead of 30. Hate won't make it go away (I wish). AND you won't
find me writing a utility to convert 29.97 to 30 fps just because
I hate 29.97 :)
Same thing for the 7.5IRE setup.
> > NOTE: reversing a 2:2 or 2:3 pulldown IS NOT deinterlacing...
> I was referring to deinterlacing, not to pull-down reversal. I know the
> difference, see above...
But some people who deinterlace do NOT know the difference.
THat's why knowing the SOURCE of the data is so important. If you're
dealing with FILM source and you have a PAL tape then it SHOULD
be possible to do a 2:2: pulldown reversal. It all depends if the
film was simply sped up by 4% (from 24 to 25fps) or a weird pulldown
done to convert 24 to 25 fps.
The tricky part comes if it is a 2:3 NTSC version that was converted
to PAL. Deinterlacing that will make a mess of things (especialy
the frames where the B/C and C/D fields are blended).
> can not see alias in them... flicker at best...
Well, PAL's 25fps does have lower temporal resolution - it's barely
above film's 24 rate and we all know how poor that is (another
long story, and not one I want to type over a dial up line ;)).
> > I think part of the problem is that '-s' was being accepted as valid
> >
> Seen, and thanks! If you hadn't done it, I would have done it rightnow ;)
You're welcome. I forgot that was there until I looked the other
night while researching things.
> PS: I will try hard to not react on your next interlaced vs.
> deinterlaced mail ;-))))))))))))))))))))) Or, better: next time I throw
OK. I will do the same :)
Steven Schultz
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