Forgive me if this subject seems pedantic to you. I think it's important and the source of a lot of
misunderstanding.
As always, correct me if I'm wrong.
According to the MPEG spec, interlace relates to fields that are temporally offset by 1/60th second
(NTSC) or 1/50th second (PAL) that typically originate as telecast streams.
Deinterlacing is conversion of the i30-telecast (or i25-telecast) to p30 (or p25) and, optionally,
smoothing the resulting p30 (or p25) frames.
Combing is fields that are temporally offset by 1/24th second (or 1/25th second) resulting from
telecine up-conversion of p24 to p30 (or p25).
Decombing is smoothing combed frames.
My video sources are generally:
p24 movies from blu-ray, or
p24 movies from DVD (i.e., soft telecine), or
i30 movies from DVD (i.e., hard telecine).
Should I ever encounter a i30-telecast video on a blu-ray or DVD, I might (but probably won't)
deinterlace.
It seems to me that some people call combing that results from telecine, interlace. Though they are
superficially similar, they're different.
Regards,
Mark.
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