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Old September 2nd, 2012, 12:04 PM   #1
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Artifacting with Cineform 4:2:2

Hi,

Im currently setting up my workflow for the Black Magic Camera and Cineform RAW and Im running into problems when using the cineform codec to render a master file.

Have a look at those pictures

1. Thats RAW. Cineform 4:4:4 looks identical.
http://www.steinhardtverlag.de/Felix/raw.JPG

2. 422. There is strange artifacting at color edges. Like saw teeth. I first thougt, this is the downside of 422 compared to 444.
http://www.steinhardtverlag.de/Felix/422.JPG

3. But pic 3 shows an x264 rendering directly from the raw file. x264 is just 4:2:0 and it looks good. Much less atrifacts than 422.
http://www.steinhardtverlag.de/Felix/x264.JPG

Im using Premiere CS5.5 and the current beta version of cineform studio premium.
Whats going on ?


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Old September 2nd, 2012, 02:17 PM   #2
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Re: Artifacting with Cineform 4:2:2

That is a display artifact not an encoding one. How are you outputing the JPG frames? You might try setting the "Filter 422 to 444" option within the "C" systray icon under "Decoder Settings"
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Old September 2nd, 2012, 02:51 PM   #3
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Re: Artifacting with Cineform 4:2:2

I output a single frame as tiff and then made the crop in photoshop.
I already see the artifacts in the premiere preview when I reimport the clip.

Filter 422 as 444 didnt help. Hmmm. I have no idea. The files look the same in Sony Vegas I just found out. No Premiere display problem.
I can of course output 444 but its unnecessary since a debayered and scaled picture of the BMC is only 4:2:2.
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Old September 2nd, 2012, 03:28 PM   #4
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Re: Artifacting with Cineform 4:2:2

I will look into why 4:2:2 to 4:4:4 filter is disbled in the 1.3 beta, should be an easy fix. As for 4:2:2 being equivalent because of bayer, that is not completely true, it is somewhere is between 4:2:2 and 4:4:4. Why not post in CineForm RAW?
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Old September 2nd, 2012, 03:35 PM   #5
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Re: Artifacting with Cineform 4:2:2

Quote:
Originally Posted by David Newman View Post
Why not post in CineForm RAW?
You mean why not do postproduction in RAW?
I will, I just want to render out a master file to archive or directly play my finished projects in maximum quality.
DNxHD also gives me some artifacts I have no solution for, so I want to use the cineform codec. As far as I know its more sophisticated than DNX, too.

But when you say the BMCC is above 422 Ill render 444 anyway.
Thanks a lot for your help!
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Old September 3rd, 2012, 11:02 AM   #6
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Re: Artifacting with Cineform 4:2:2

I just fixed the 4:2:2 to 4:4:4 presentation bug. All 4:2:2 encodings are fine.
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