How to : HDR ?

[pcossinet]

Today we work with AvPro decklink in 1080i50, 1080p50 & 20160p50 with Decklink duo 2 & Decklink 8K and all is ok, the plugin is awesome.

We are looking for the future: HDR

Our Dev Setup

• Unity 2020.3.12f1
• AvPro Decklink 1.9.5
• Decklink API 12.2.0.0
• Decklink UltraStudio 4K Mini
• Decklink Video Assist 7" HDR 12G

With a clean Project we added a Camera and Avpro Decklink Output
common setting:

• HD1080p
• FrameRate 50
• No Interlaced
• Use Hdr enabled

Test 1: 8-bit UYVY 4:2:2 / Rec 709

Output ok
No HDR icon on Monitor
Rec.709 indicator

Test 2: 8-bit UYVY 4:2:2 / Rec 2020

Output ok
No HDR icon on Monitor
Rec.709 indicator

Test 3: 8-bit UYVY 4:2:2 / Rec 2100

Output ok
HDR icon on Monitor
Rec.709 - HLG indicator

Test 4: 10-bit UYVY 4:2:2 / Rec 2100

Output Dark
HDR icon on Monitor
Rec.709 - HLG indicator

8-bit RGBA & 8-bit ARGB works like 8-bit UYVY
10-bit RGB, RGBX & RGBX LE doesn't output anything

So we are a little confuse about the right utilisation of the plugin for HDR output.

What we expected is:

• 10-bit format
• enabled HDR
• select the rightColor Space with the BroadCast partner

But the only good setting with this setup is:
Setup 3: 8-bit UYVY 4:2:2 or 8-bit RGBA / Rec 2100

Output ok
HDR icon on Monitor
Rec.709 - HLG indicator

What is in your opinion the good settings or requested version or setup to have a true HDR output ?

Thanks for your feedback

[RichRH]

Hi @pcossinet,

Thanks for your feedback and the detailed report - I'm looking into this to see if I can spot any other oddities but observations/feedback so far:

• You state 'No Interlaced' but the monitor is reporting '1080i50' in your grabs - I've tested here and toggling the interlaced flag seems to correctly report 1080i50/1080p50 (just wondering if you're seeing a bug)
• I'm testing with a new scene like yours, Decklink 8K Pro into Video Assist 7" HDR 12G over SDI (1080p50)
• 'Use Hdr' flag is required for capture textures to be treated as floating point (and thus permit HDR ranges)
• Rec. 709, 2020 and 2100 appear to output and be correctly detected by the Video Assist with YUV formats (NOTE: 2100 is reported as '2020 - HLG')
• Only Rec. 2100 supports HDR output and we currently only support the HLG transfer function - 8 and 10-bit YUV seem to output and be detected as expected, although 8-bit shouldn't really be used with HDR
• I've located a bug with 10-bit RGB formats which indeed prevents output - will look into fixing ASAP, so currently Rec. 2100 10-bit YUV is your best bet for HDR <- UPDATE: I've fixed 10-bit RGB output for the next release but the current shaders don't handle any HLG conversion, only 10-bit YUV does (adds to below TODO)
• We have some improvements on our TODO list including HDR10/PQ support and 12-bit formats

Cheers,

[RichRH]

With the release of 1.9.6 (fix for 10-bit RGB not outputting) I'm changing this ticket to an 'enhancement' for the 'HDR10/PQ support and 12-bit formats' TODOs

[pcossinet]

Hello,

Thanks for your fast response !

With the same setup (Decklink UltraStudio 4K Mini + Decklink Video Assist 7" HDR 12G) and the new 1.9.6 release 10-bit RGB is working very well.

I still have something strange with the interlaced option:
FrameRate 50 + interlaced Off > the Video Assist show "1080i50 HDR Rec 709 - HLG"
FrameRate 50 + interlaced On > the Video Assist show "1080i50 HDR Rec 2020 - HLG"
FrameRate 25 + interlaced Off > the Video Assist show "1080p25 HDR Rec 2020 - HLG"

I don'k know if it come from my setup (I'm not using a decklink 8k pro)

UPDATE:

I solve the problem with Smtpe Level setting
If I set this setting to Level A instead of unspecified the output in Video Assist is good;
FrameRate 50 + interlaced Off > the Video Assist show "1080p50 HDR Rec 2020 - HLG"

https://photos.google.com/photo/AF1QipMWxTKp9clvPQ0LkXqdrGvEHVeYGiOvrRlWxNQk

Thanks for all, your plugin is amazing !

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