Compensating for retrograde field behavior

[johnmeyer]

Originally Posted by hello_hello

Only fields are repeated, not whole frames.

Yes, this is a very common misconception. It is so common that I've actually seen video where people who don't know any better have done this (repeated frames instead of fields). While you get some judder artifacts when you do telecine correctly, if you instead repeat frames, that judder becomes massively worse because the intentional temporal glitches are done half as often, and across the entire frame.

Repeating fields is actually extraordinarily clever and, in the old CRT-based, continuous scanning system, looked amazingly good. 99.99% of the population never thought twice about how film looked when shown on television.

[hello_hello]

Originally Posted by Katie Boundary

EDIT: here, hav sum Gargoyles! https://www.sendspace.com/file/rhkoto

MOAR EDITZ: here, hav sum Robocop! https://www.sendspace.com/file/99v0xp

Maybe I'm missing something, but I don't see a reason for anything but standard IVTC of the Gargoyles sample. You just need to set a low de-interlacing threshold for TFM so it catches what looks like combing during fade-outs/fade-ins.
I'm not sure it is combing as such though. Anyone know what causes that? Is it a chroma subsampling issue when blending interlaced video?
There's lots of dot crawl, which seems to be baked in, and a fair amount of rainbowing, but that's another story.

I could be wrong, but the Lions Gate promo at the beginning of RoboCop looks like interlaced content resized, similar to the Babylon 5 CGI. If everything following it is progressive, this would be an easy way to fix it.

TFM().TDecimate()
Trim(205, 0)

[manono]

Originally Posted by Katie Boundary

Telecine is when 24 fps content is slowed down to 23.976 fps, and then either every fourth frame or every fourth field is doubled to bring the frame rate up to 29.97 fps

Originally Posted by hello_hello

Only fields are repeated, not whole frames.

Well, I have seen retail DVDs where every fourth frame is repeated (12344). But that's not telecine. True telecine is, as you mentioned, when fields are repeated. Does it depend on the definition of "telecine"? Is it telecine when frames are repeated? Is it telecine when a film source is field-blended to 29.97fps? Is it telecine when a 25fps PAL source is field-blended to 29.97fps? I say no.

Is it telecine when a 20fps silent film is hard or soft telecined to 29.97fps? Is it telecine when a 25fps PAL source is hard or soft telecined to 29.97fps? I say yes. The Wikipedia seems to agree.