Blurry Clean Feed playback with cropped UHD clips

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Ben Carlson

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  • Joined: Tue May 14, 2013 3:07 pm

Blurry Clean Feed playback with cropped UHD clips

PostFri Nov 26, 2021 4:46 pm

I have just noticed that when playing UHD2160 (H.264 MP4) clips in a FHD1080 timeline, with the Retime&Scaling/Scaling set to "crop" (to use the extra source resolution for virtual pan&zoom) and Clean Feed set to my secondary FHD display, the picture is slightly but visibly blurred and returns to normal sharpness as soon as I stop playback. I don't have this with (non-cropped) FHD clips.
I wonder if this due to the GPU decoding during playback (nVidia Quadro P2000/4GB) or if this is a 'feature' because the real-time scaling (actually NOT, since this is a FHD crop in a UHD clip).
In my current project, this makes judging the sharpness of the cropped pic more difficult, the real scene's sharpness being visible only when I stop playback.
Also, before finalizing my overall workflow for this first long (multicam, multi-res, 40+ hours of rushes) project with Resolve Studio, I would like to be sure the final output will be as sharp as possible.

(Resize filter is set to Lanczos, but changing this param doesn't change anything as there's NO resize in this case with a FHD crop in a UHD clip)

What is the cause of this ? Will it impact my final output ? Is there a way to keep maximum sharpness when playing back the FHD cropped UHD ?
Could it be controlled by one of the [many] settings found in the nVidia Control Panel ?
DR Studio 18.1.4 Win10Pro 22H2 19045.3448 i7-8850H 2.6GHz - 32GB RAM;
nVidia Quadro P2000 4 GB (532.09)
OS,Library,Project: 1TB SSD - Cache & src media files: 500GB NVMe
ATEM TVS (8.6.4), VA 4k (2.5.4)
Mini Monitor & Mini Recorder (Deskt Vid 12.0)
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Brown5x

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  • Joined: Tue Jul 28, 2020 12:39 pm
  • Real Name: David Brown

Re: Blurry Clean Feed playback with cropped UHD clips

PostFri Nov 26, 2021 8:17 pm

Is this your issue?

(From a previous thread)

If you're a Windows user and you try to set the Davinci Workspace to multiple 4k monitors, you're in "unsupported" territory, and you may have cropped clean feeds, unrecognized mouse clicks, etc. These problems are NOT caused by an incompatible scaling setting somewhere that you can find and magically fix. The limitation is baked into the Davinci software (at least through Davinci version 17.2.2).

There is a way to completely eliminate the problem. In the Windows settings for Display, downgrade all displays to 1920x1080 scaled at 100%. Now your multi-monitor setup in Windows will be fully supported by Davinci. You can right-click on any screen, and you can send a clean feed to any screen. Everything works if you monitor in HD.
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John Paines

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Re: Blurry Clean Feed playback with cropped UHD clips

PostFri Nov 26, 2021 8:41 pm

Disable Performance Mode under user preferences (playback settings), and see what happens.

Ben Carlson wrote:I have just noticed that when playing UHD2160 (H.264 MP4) clips in a FHD1080 timeline, with the Retime&Scaling/Scaling set to "crop" (to use the extra source resolution for virtual pan&zoom) ?


You do know that 'crop' isn't necessary for your purposes? You can scale these images to fit on a HD timeline, and still zoom and pan without losing access to the original UHD resolution.
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Ben Carlson

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  • Joined: Tue May 14, 2013 3:07 pm

Re: Blurry Clean Feed playback with cropped UHD clips

PostSat Nov 27, 2021 11:02 am

Brown5x wrote:Is this your issue?

(From a previous thread)

If you're a Windows user and you try to set the Davinci Workspace to multiple 4k monitors, you're in "unsupported" territory, and you may have cropped clean feeds, unrecognized mouse clicks, etc. These problems are NOT caused by an incompatible scaling setting somewhere that you can find and magically fix. The limitation is baked into the Davinci software (at least through Davinci version 17.2.2).

There is a way to completely eliminate the problem. In the Windows settings for Display, downgrade all displays to 1920x1080 scaled at 100%. Now your multi-monitor setup in Windows will be fully supported by Davinci. You can right-click on any screen, and you can send a clean feed to any screen. Everything works if you monitor in HD.

My 2 monitors are 1920x1200
DR Studio 18.1.4 Win10Pro 22H2 19045.3448 i7-8850H 2.6GHz - 32GB RAM;
nVidia Quadro P2000 4 GB (532.09)
OS,Library,Project: 1TB SSD - Cache & src media files: 500GB NVMe
ATEM TVS (8.6.4), VA 4k (2.5.4)
Mini Monitor & Mini Recorder (Deskt Vid 12.0)
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Ben Carlson

  • Posts: 226
  • Joined: Tue May 14, 2013 3:07 pm

Re: Blurry Clean Feed playback with cropped UHD clips

PostSat Nov 27, 2021 11:02 am

John Paines wrote:Disable Performance Mode under user preferences (playback settings), and see what happens.

Will try that
DR Studio 18.1.4 Win10Pro 22H2 19045.3448 i7-8850H 2.6GHz - 32GB RAM;
nVidia Quadro P2000 4 GB (532.09)
OS,Library,Project: 1TB SSD - Cache & src media files: 500GB NVMe
ATEM TVS (8.6.4), VA 4k (2.5.4)
Mini Monitor & Mini Recorder (Deskt Vid 12.0)

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