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Old 23rd September 2019, 08:54   #1  |  Link
VictorLS
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Join Date: Mar 2009
Location: Russia
Posts: 166
HLG processing for good picture on SDR monitor

Due to huhn's "madVR doesn't support HLG" in thread LAV Filters - DirectShow Media Splitter and
Decoders
here I've known madVR still not support HLG if it can be correctly done at all (as MPC-BE developer says there's only few HLG content so they don't want support HLG in their MPC-BE well - present their EVR Custom Presenter (EVR-CP)'s auto switching on as minimum with DXVA2 (native and copy-back) Processing: HDR(HLG) to SDR gives overcontrasted and bad saturated video as minimumn on SDR monitors - even worse than without any processing - washed out colors and i.e. red becomes orange w/o processing:
SDR (well):

HLGw/oProcessing (undersaturated and undercontrasted):

HLGtoSDRprocessing (oversaturated and overcontrasted):

I've found with old version of LAV Video Decoder 0.68.1.35 (modified by Aleksoid1978 to accelerate 4K h265 10bit via NVIDIA CUVID in WinXP) Processing: HDR(HLG) to SDR not switching on even in any DXVA2 mode.
Return to huhn's "madVR doesn't support HLG" - I'm not pity very much because my old computer couldn't use madVR in modes showing not worse than EVR or EVR-CP on 4K but I want watch F1 in HLG h265 10bit 4:2:0 4K with colors not worse than before HLG (see SDR picture) in i.e. 2018 - I've recorded many files to compare - here's three of them:
20180729-160530_RTL UHDsdr.ts (73MB) https://yadi.sk/i/nKbwy-6ohkWQxw
20190511-140255_RTL UHDhlg.ts (19MB) https://yadi.sk/d/sVcYR6QgkfcGOw
20190630-183800_RTL UHDhlg.ts (14MB) https://yadi.sk/d/OjMMtl5d6JibQQ
But my GTX750v2 videocard is strong enough to process 4K video with shaders (i.e. Convert HDR to SDR or HDR but they gives wrong colors too) in EVR-CP so my questions are:
1. Does anybody know some another HLG to SDR shader I can try?
2. Can anybody write such shader which can process HLG metadata (repeat - if it can be correctly done at all)?
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