Help! 10-bit ProRes422HQ problems

[Jeremy Garchow]

A couple of things pop in to mind.
What’s your source footage?

[Mike Parfit]

Thanks for writing,

The source footage is varied. Most of it is HDV captured through SDI into ProRes422HQ. Other stuff is DV uprezzed to ProRes1080i using Compressor. One clip that really suffers is a high resolution still.

In addition to the problems above, I’ve also noticed that some clips have a few places where other colors, mostly green, pop up here and there — not necessarily at the brightest parts of the picture, and again only when rendering in 10 bit.

The timeline is ProResHQ at 1080i 60.

Thanks for any help you may have,

Mike

[David Roth weiss]

Mike,

Change the compressor to ProRes non-HQ, then re-render, and see if that helps. If not, then try capturing a bit at non-HQ quality and see if that helps. I recommended this to another user and it seemed to cure similar issues.

David

David Roth Weiss
Director/Editor
David Weiss Productions, Inc.
Los Angeles

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[Mike Parfit]

Hi, David,

Thanks. We don’t have any problem getting a rendered clip or creating a timeline that renders fine — as long as we don’t render in 10-bit. I’m not sure how much we give up by going to non HQ, but my guess would be it could be the same level of loss (but not the same kind) that we get going from 10 bit to 8 bit with the HQ stuff. We get an instantly visible difference in image quality in some kinds of images when we render with 10 bit. But if we’re going to get these kinds of artifacts in some of the shots, that makes the whole thing questionable.

The problem only happens with 10-bit rendering, not with ProResHQ in 8-bit. That is what seems puzzling.

Thanks,

Mike

[Todd Dalton]

Hi,

You mention the rendering in YUV, have you tried rendering in RGB (as in the timeline options page)? I’ve had similar where my graphics card couldn’t handle rendering certain fx in YUV – full green screens instead of colourful pictures and the like. Switching the option to RGB gave me an output… Not that it guarantees legalised pictures! Had to be careful about that 🙂

T

[Rafael Amador]

Mike,
The Nattress Chroma Smooth/Sharpen Filter will be helpful for your 4.2.0/8b footage going 4.2.2/10b.
I had some times a strong electric-blue in dark areas when using the 3W-CC. No problems with Colorista.
Rafael

http://www.nagavideo.com

[Jeremy Garchow]

[Mike Parfit] “One clip that really suffers is a high resolution still. “

Make sure that your stills are RGB and not CMYK

[Connie Simmons]

Hi. I had a program (HD Cam footage imported through AJA IOHD into ProResHQ) and I used many high resolution stills. I also tried to render in YUV high precision. I had different things happen to the renders of the stills(black screen instead of still, strange color, so I ended up 1) taking those stills and handles and putting them in a timeline where I changed the settings to 8-bit YUV), 2) rendering them, and 3)exporting them as a QT movie, current settings (no Audio), and then 4) importing them into my timeline as a clip.

A pain but seemed to work. I am still not sure if there is a difference in final quality of the 8-bit and 10-bit YUV high quality rendering setting.

Best, Connie

[Chris Borjis]

mike do you have the render setting for 32-bit high precision yuv?

that has been a problem for me everytime I use it no matter the codec.

try putting it at 10-bit or 8-bit, one of those should get you through.