Cannot output HDR metadata EOTF = HDR(1). Not supported?

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altug.simsek

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Cannot output HDR metadata EOTF = HDR(1). Not supported?

PostWed Feb 05, 2020 10:12 am

I am using SignalGenHDR to output HDR metadata and CapturePreview to display them.
I am focusing on HDR metadata EOTF.

PQ and HLG EOTF metadata works OK. When I select PQ or HLG on the SignalGenHDR, I see the corresponding values in CapturePreview.

When I try to implement HDR EOTF (which I believe is traditional gamma 2.4 on HDR), I cannot observe it on CapturePreview. I observe SDR.

Supported EOTFs are defined as SDR=0, HDR=1, PQ=2, HLG=3.
Is HDR EOTF metadata output not supported in current software version?


Card used: Decklink 4K Extreme 12G
Driver 11.4.1
SDK: 11.4
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Cameron Nichols

Blackmagic Design

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Re: Cannot output HDR metadata EOTF = HDR(1). Not supported?

PostThu Feb 06, 2020 1:50 am

Hi Altug,

Can you confirm whether you are capturing from HDMI or SDI?

Regards
Cameron
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altug.simsek

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Re: Cannot output HDR metadata EOTF = HDR(1). Not supported?

PostWed Feb 19, 2020 2:55 pm

Dear Cameron,

We use HDMI.
An HDMI cable is used to loop HDMI output to HDMI input on the same card.

A
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Cameron Nichols

Blackmagic Design

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Re: Cannot output HDR metadata EOTF = HDR(1). Not supported?

PostWed Feb 19, 2020 11:47 pm

Hi Altug,

No EOTF = 1 is not supported by HDMI capture. The EOTF support is advertised in EDID by calling IDeckLinkHDMIInputEDID::SetInt[1] with ID bmdDeckLinkHDMIInputEDIDDynamicRange[2]. The accepted values for dynamic range are defined by enum BMDDynamicRange[3]

Regards
Cameron

References
[1] 2.5.45.1 IDeckLinkHDMIInputEDID::SetInt method
[1] 2.7.67 HDMI Input EDID ID
[2] 2.7.68 Dynamic Range
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altug.simsek

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Re: Cannot output HDR metadata EOTF = HDR(1). Not supported?

PostThu Feb 20, 2020 11:24 am

Dear Cameron
Thanks for your reply.
We are not obliged to use HDMI. I can switch to SDI.
Are all EOTF values supported in SDI?
Both capture and output?

Regards
Altug

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