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Sony 24 Cineframe footage in Twixtor

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tonyota
Sony 24 Cineframe footage in Twixtor
on Apr 30, 2006 at 4:53:11 pm

Software: AE 6.5
Footage: Sony Z1U 24 Cineframe Mode
OS: Windows

If I've shot images in 24 Cineframe Mode will I need to purchase the fields kit in order to process the 3:2 pulldown properly before using my footage in After Effects? I've read that 24 cineframe is not really 24p so as for how this type of footage relates to Twixtor, what is the best workflow in terms of interpreting footage, project frame rates etc....I noticed that when I look at the footage on the AE comp timeline, that for every 6 frames, there is one still frame - I'm guessing this has to do with 3:2. How do I interpret this?



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shin kurokawa
Re: Sony 24 Cineframe footage in Twixtor
on Apr 30, 2006 at 6:49:57 pm

Right. I just happened to meet a couple of customers at NAB
that had the exact problem. Just because the
manufacturer has "24" somewhere in their cam(corder)
spec does not mean the footage _is_ 24p or can
be inversed (IVT'ed) to obtain 24p frames!

That Cineframe24 mode is, as far as I can understand it,
an 'effect' to mimic the 24p+3:2pulldown=60i effect,
and if you try to do an inverse, you'll get progressive frames
that alternate between full resolution and half
resolution, which is horrible.
That's because Cineframe throws out a field
at appropriate places.
Nothing like a true 3:2 pulldown, though it _looks_ like
a real pulldown-added footage when it's running at full speed.

So the best solution would be, if you want to use
Twixtor and other effects and need access to
full resolution frames at all times, shoot in 60i.
A combination of Fieldskit and Twixtor, though a bit
slow, is quite useful for creating 24p output from
60i/50i etc. In a pinch, you could skip the FK step
completely, since Twixtor can deal with interlaced
input and output progressive frame as well.

Check out the big Twixtor tutorial on how to do this...
The big one...
http://revisionfx.com/rstwixtortutorials.htm


-Shin



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Pierre Jasmin
Re: Sony 24 Cineframe footage in Twixtor
on Apr 30, 2006 at 10:02:22 pm


http://www.adamwilt.com/HDV/cineframe.html

If we can recover the exact cadence, if need be, I presume we could deal with it in the next version of FK. Looks like the red, green and blue are relatively offsetted as well, and there is an internal horizontal scaling as well...
http://www.hdtvexpert.com/pages_b/hdrfx1.html
http://www.cineform.com/products/SonyHDVSupport/CineFrame.htm

Is this a format for people who use the SD downconverter on their HD cam?

Pierre


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tonyota
Re: Sony 24 Cineframe footage in Twixtor
on May 2, 2006 at 9:53:44 pm

Not really sure about the downverting format. I was just using it b/c I thought I liked the effect I was achieving when working with models. The problem I'm having now is, I love the look, but can't quite figure out how to interpret the footage so that I can retime it.

If I'm retiming a model to 20% of it's original speed, the "dead frame" is way too obvious and I'm getting a very jaggery effect.


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Pierre Jasmin
Re: Sony 24 Cineframe footage in Twixtor
on May 4, 2006 at 2:32:19 am


If you send techsupport@revisionfx.com 10 frames of something that moves I can look at it, it would imply another mode in FK Pulldown (CineFrame24) I guess.

Pierre
http://www.revisionfx.com


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