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4:4:4 1080 from 4K workflow in FCPX

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AJ Epstein
4:4:4 1080 from 4K workflow in FCPX
on May 19, 2016 at 5:09:31 am

Hi all,

I've been googling and searching quite a bit, but can't find much on point with actual workflow descriptions.

There are many folks talking generally about the possibility of taking 4:2:0 4K footage out of some of the newer cameras - Panasonic GH4 and DVX200 specifically, and compressing it down into 4:4:4 1080. The only actual workflow I could find involved using Adobe CC and a GoPro codec.

Has anyone done this within FCPX or Compressor? If so, is there a well described guide? I've not been able to find much more than "yeah dude, that's possible" in my searching.

thanks!


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Noah Kadner
Re: 4:4:4 1080 from 4K workflow in FCPX
on May 19, 2016 at 11:20:13 am

For what purpose? You wouldn't be increasing quality- just placing less data into a larger pipe on the color side.

Noah

FCPWORKS - FCPX Workflow
FCP Exchange - FCPX Workshops


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Joe Marler
Re: 4:4:4 1080 from 4K workflow in FCPX
on May 19, 2016 at 12:41:39 pm

[AJ Epstein] "There are many folks talking generally about the possibility of taking 4:2:0 4K footage out of some of the newer cameras - Panasonic GH4 and DVX200 specifically, and compressing it down into 4:4:4 1080. The only actual workflow I could find involved using Adobe CC and a GoPro codec.

Has anyone done this within FCPX or Compressor? If so, is there a well described guide?"


This is a good question and I don't have a specific answer. It is supposedly possible to convert 4K 8-bit 4:2:0 to 1080 10-bit 4:4:4, trading spatial resolution for bit depth and color resolution. This was widely discussed when the GH4 came out:
http://www.eoshd.com/2014/02/discovery-4k-8bit-420-panasonic-gh4-converts-1...

This article says it only works if you don't crop or stabilize the 4K material (else you don't have 4K before the conversion begins):
http://www.provideocoalition.com/can-4k-4-2-0-8-bit-become-1080p-4-4-4-10-b...

There is a long complex thread discussing various workflows (mostly using ffmpeg) but no single agreed-upon solution: http://www.personal-view.com/talks/discussion/10637/4k-downscaling-progress...

This thread discussed a custom OS X command-line tool (no longer available) which supposedly did the conversion: http://www.eoshd.com/comments/topic/5426-mac-app-to-resample-gh4-8-bit-420-...

There is commentary about whether just doing the conversion in Resolve might be good enough, but no clear cut tests and answers.


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Darren Roark
Re: 4:4:4 1080 from 4K workflow in FCPX
on May 20, 2016 at 3:46:35 am

Essentially it boils down to mining the color information from the three extra UHD to HD pixels for the color information.

The initial tests I've seen look promising but I don't have definitive evidence that it's a true 4:4:4:4.


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Jeff Kirkland
Re: 4:4:4 1080 from 4K workflow in FCPX
on May 20, 2016 at 10:44:34 am

I've seen the math but I'm not convinced it's more than a theoretical advantage.

(For some reason I can't edit my own posts so apologies in advance for the stupid mistakes and bad English that I can't go back and fix)

Jeff Kirkland | Video Producer & Cinematographer
Melbourne, Australia | Twitter: @jeffkirkland


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