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CESNET / UltraGrid

UltraGrid low-latency audio and video network transmission system
http://www.ultragrid.cz
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HDR Metadata over HDMI #131

Closed garcurr closed 3 years ago

garcurr commented 3 years ago

Hi All

Having followed a previous thread started by alatteri I am trying without success to get the HDR metadata over HDMI from a Decklink (4K Extreme 12G) to work.

I'm running UltraGrid 1.6+ (tags/continuous rev 73d4a5b1 built Feb 10 2021 14:59:38)

I've tried an LG, Sony and Panasonic TV. But with all available options ./uv -d decklink:HDR=PQ, =HLG etc the TV's stay in SDR and do no switch to the flagged HDR mode. I've tried rolling back BMD drivers to 11.6 but that hasn't made any difference.

Any help would be greatly appreciated. Thanks Gary

MartinPulec commented 3 years ago

Hi Gary,

just FYI, it is also possible in UltraGrid to use numbers 0-7 (should be indices of transfer functions as per CEA 861).

UltraGrid tries to mimic the behavior of SignalGenHDR example from BlackMagic DeckLink SDK. Would you be able to compile and run it to check whether you can find a suitable parameters there? If you give me your platform, I may perhaps compile it for you.

garcurr commented 3 years ago

Hi Martin

I did try 0-7 without success. If I run ./uv -d decklink:hdr=help I do see the HDR parameters are available for the card, I think. I'm a bit new to compiling so will give it a go but if you were able to compile that would be great. I'm on a Mac Pro (2019) Catalina 10.15.3.

Many Thanks Gary

MartinPulec commented 3 years ago

Hi Gary,

If I run ./uv -d decklink:hdr=help I do see the HDR parameters are available for the card, I think.

Not really - it is not taken from the card. I think that if the card supports HDR, it can output arbitrary HDR metadata.

I'm a bit new to compiling so will give it a go but if you were able to compile that would be great. I'm on a Mac Pro (2019) Catalina 10.15.3.

Fortunately notably for macOS there are precompiled binaries in the SDK - if you unzip the SDK, there is an image in the SDK root directory - Mac/Samples/Binaries.dmg. If you mount and open it, there are bunch of apps, but notably SignalGenHDR. I've tried and the application shows a window where there can be tweaked those HDR parameters (I could not have tested with a real DeckLink, since I have no attached, however).

Regards, Martin

garcurr commented 3 years ago

Hi Martin.

Tried SignalGenHDR, and it looks like the decklink card is older than I realised and doesn't have HDMI 2.0a output. Getting hold of a newer Decklink. Thanks for your help.

Best Gary

MartinPulec commented 3 years ago

Ok, thanks for the info, so I'd perhaps close it for now.

garcurr commented 3 years ago

Working with a Decklink 4k Mini Monitor. Thanks