12bit UHD SDI capture is broken

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alatteri

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  • Joined: Fri Jul 17, 2020 7:22 pm
  • Real Name: Alan Latteri

12bit UHD SDI capture is broken

PostFri Sep 23, 2022 1:23 am

Hello,

I've been trying to figure this out with the UltraGrid guys. When capturing a 12bit RGB444 UHD SDI input signal, the colors are all crazy. When SDI output is 10bit RGB444 UHD, capture is fine. See attached screen shots.

I've tested capture with UltraGrid, FFMPEG and even MediaExpress (Ubuntu). I've tested outputs from both Flame and Resolve (RockyLinux). Always the same results.

2K DCI 12bit RGB444 is fine though, the issue is only UHD.

I've tried several different decklinks, from UltraStudio 4K Mini, Decklink 8K Pro, DeckLink 4K Extreme 12G.

Settings in Resolve

IMG_0654.jpeg
IMG_0654.jpeg (330.21 KiB) Viewed 212 times


IMG_0653.jpeg
IMG_0653.jpeg (147.69 KiB) Viewed 212 times


IMG_0652.jpeg
IMG_0652.jpeg (214.58 KiB) Viewed 212 times
Offline

alatteri

  • Posts: 12
  • Joined: Fri Jul 17, 2020 7:22 pm
  • Real Name: Alan Latteri

Re: 12bit UHD SDI capture is broken

PostFri Sep 23, 2022 10:31 pm

See this video, shows it all very clearly.


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