On 02/04/2021 06:50 PM, Mark Filipak (ffmpeg) wrote:
For discussion: A better video notation.
24PPS@23.9FPS (aka "24p") Cinema (i.e. 24PPS) mastered at 23.9FPS, 0.1%
slow.
24PPS@23.9FPS (aka "30i") Soft-telecined: cinema with 29.9FPS metadata,
0.1% slow.
24PPS@25FPS (aka "25i") Cinema with 25FPS metadata, 4% fast.
24PPS@29.9FPS (aka "30i") Hard-telecined: cinema converted to 29.9FPS,
0.1% slow.
25PPS@25FPS (aka "25i") Cinema interpolated to 25PPS, no speed up.
29.9PPS@29.9FPS (aka "30p") 29.9PPS video at 29.9FPS (some documentaries).
50SPS@25FPS (aka "25i") PAL broadcast TV interlaced to 25FPS.
50SPS+24PPS@25FPS (aka "25i") Mix of 50SPS@25FPS & 24PPS@25FPS (some "Making
of" docs).
59.9SPS@29.9FPS (aka "30i") NTSC broadcast TV interlaced to 29.9FPS.
59.9SPS+24PPS@29.9FPS (aka "30i") Mix of 59.9SPS@29.9FPS & 24PPS@29.9FPS (some
"Making of" docs).
IRREGULAR@29.9FPS (aka "30i") Having various frame/field repeats/discards
with image loss.
I decided that using lower case was more readable. What do you think?
24pps@23.9fps (aka "24p") Cinema (i.e. 24pps) mastered at 23.9fps, 0.1%
slow.
24pps@23.9fps (aka "30i") Soft-telecined: cinema with 29.9fps metadata,
0.1% slow.
24pps@25fps (aka "25i") Cinema with 25fps metadata, 4% fast.
24pps@29.9fps (aka "30i") Hard-telecined: cinema mastered at 29.9fps,
0.1% slow.
25pps@25fps (aka "25i") Cinema interpolated to 25pps, mastered at
25fps, no speed up.
29.9pps@29.9fps (aka "30p") 29.9pps video mastered at 29.9fps -- some
documentaries.
50sps@25fps (aka "25i") PAL broadcast TV, scan-interlaced, mastered
at 25fps.
50sps+24pps@25fps (aka "25i") Mix of 50sps@25fps & 24pps@25fps -- some "Making
of" docs.
59.9sps@29.9fps (aka "30i") NTSC broadcast TV, scan-interlaced, mastered
at 29.9fps.
59.9sps+24pps@29.9fps (aka "30i") Mix of 59.9sps@29.9fps & 24pps@29.9fps -- some
"Making of" docs.
irregular@29.9fps (aka "30i") Having various frame or field discards with
temporal image loss.
This system is extensible to non-DVD/-BD transcodes (e.g. @59.9fps) but I'm a bit miffed by some
DVDs that I've encountered.
For example, I have a couple of DVDs from Korea that are @29.9fps but get there via frame repeat,
not via telecine -- of course the judder was awful until I fixed it.
24pps@29.9fps doesn't fit such a case because the original 24fps can't be obtained via detelecine,
but by dropping the repeated frame, instead. So I'm playing with such frame repeats by something
like '24pps+6pps@29.9fps'. Of course, that doesn't seem very intuitive, and novices will question
it, at least at first. Perhaps '(24+6)pps@29.9fps' expresses it better. Or maybe
'6x(4+1)pps@29.9fps' or maybe '6x(1-1-1-2)pps@29.9fps'. Whatever, things get messy.
--
I don't have a dog.
And furthermore, my dog doesn't bite.
And furthermore, you provoked him.
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