[HELP] 4K HDR x265 to 1080p SDR AV1

[LuCa4S]

Hello,

I have problem with conversion 4K HDR10 x265 to 1080p SDR AV1.
Almost everything works perfectly fine, but I can't achieved SDR colors.
I tried Filtering->Vapoursynth->Color->HDR to SDR->HDR10ToSDR but it doesn't effect. 
I tried also ToneMap setting, but I only enable it. I didnt change anything so... it also dont make effect
After conversion source and output videos looks the same.


I found this thread:

https://forum.selur.net/thread-249.html

But settings are completely different for AV1 codec. 
If I may please some guide to make through this. My ideas end

I'll be grateful for any help.

Greetings
PS: Sorry I forgot. I using Windows 10 and newest hybrid (today downloaded) version.

[Selur]

Filtering->Vapoursynth->Color->HDR to SDR->HDR10ToSDR but it doesn't effect.

Did a quick test, just enabling HDR10ToSDR and it works fine here:

I also checked the Vapoursynth script view:

# Imports
import vapoursynth as vs
# getting Vapoursynth core
import sys
import os
core = vs.core
# Import scripts folder
scriptPath = 'F:/Hybrid/64bit/vsscripts'
sys.path.insert(0, os.path.abspath(scriptPath))
# Loading Plugins
core.std.LoadPlugin(path="F:/Hybrid/64bit/vsfilters/SourceFilter/DGDecNV/DGDecodeNV.dll")
# Import scripts
import tmap
# source: 'G:\TestClips&Co\files\HDR\HDR10\HDR 2020.mkv'
# current color space: YUV420P10, bit depth: 10, resolution: 3840x2160, fps: 23.976, color matrix: 2020ncl, yuv luminance scale: limited, scanorder: progressive
# Loading G:\TestClips&Co\files\HDR\HDR10\HDR 2020.mkv using DGSource
clip = core.dgdecodenv.DGSource("J:/tmp/mkv_7fdb93a272e97a08002fb0b6279a6406_853323747.dgi")# 23.976 fps, scanorder: progressive
frame = clip.get_frame(0)
# Setting detected color matrix (2020ncl).
clip = core.std.SetFrameProps(clip, _Matrix=9)
# Setting color transfer (to 2020ncl), if it is not set.
if '_Transfer' not in frame.props or not frame.props['_Transfer']:
  clip = core.std.SetFrameProps(clip, _Transfer=14)
# Setting color primaries info (to 9), if it is not set.
if '_Primaries' not in frame.props or not frame.props['_Primaries']:
  clip = core.std.SetFrameProps(clip, _Primaries=9)
# Setting color range to TV (limited) range.
clip = core.std.SetFrameProp(clip=clip, prop="_ColorRange", intval=1)
# making sure frame rate is set to 23.976
clip = core.std.AssumeFPS(clip=clip, fpsnum=24000, fpsden=1001)
clip = core.std.SetFrameProp(clip=clip, prop="_FieldBased", intval=0) # progressive
# Color Adjustment
clip = tmap.hablehdr10tosdr(clip=clip, source_peak=1000, desat=50, tFormat=vs.YUV420P8, tMatrix="709", tRange="limited", color_loc="center", lin="True", show_satmask="False", show_clipped="False")
# adjusting output color from: YUV420P8 to YUV420P10 for NVEncModel
clip = core.resize.Bicubic(clip=clip, format=vs.YUV420P10, range_s="limited")
# set output frame rate to 23.976fps (progressive)
clip = core.std.AssumeFPS(clip=clip, fpsnum=24000, fpsden=1001)
# Output
clip.set_output()

and the script looks as it should.
I additionally tried the other HDR->SDR methods with their default values,... (settings usually should be adjusted)
I then disabled HDR10toSDR and enabled ToneMap:

then I disabled ToneMap and enabled 'HDR10 to SDR (DG)'

disabled 'HDR10 to SDR (DG)' and enabled 'ToneMap (Placebo)':

disabled 'ToneMap (Placebo)' and enabled 'TimeCube with 'BT2020 to BT601_NTSC':


Not sure, what you are doing. One thing that comes to mind is that you might want to check the VUI settings in your encoding settings.

After conversion source and output videos looks the same.

On an HDR monitor or with a media player that supports HDR to SDR conversion on-the-fly, this is the ideal outcome.
(ideally HDR->SDR converts the HDR data to change the SDR representation so that it looks as similar as possible to the HDR version)

Can't really reproduce your problem.

=> What does MediaInfo say about the input and the output?

Cu Selur

Ps.: in Comparison view for HDR content, the left always shows the SDR data in the stream without the HDR data applied. (so the same way a none-HDR capable player would show the video)

[LuCa4S]

I'm sorry Mr. Selur.

Propably You have right, its working. Filters are working.
But look:
Screenshots:


On the left original file, on the right after conversion.
Differences are obvious...
But later i open both files in same time in 2 different vlc's and this is effect:



Same here. Left are original. Right converted. For me difference are not that "big".
It's weird. I dont know what is happen. Thanks anyway Mr Selur  .

[Selur]

Like I wrote, you might want to tweak the settings of the HDR->SDR conversion.
What HDR to SDR does is color grading, and there is no 'this is the way'-method/-standard to do it.

Also, not sure how well this can be captured on screen captures, since on a real hdr monitor the monitor does the hdr data handling, not the gpu/cpu.
Also, if you don't have an HDR monitor, the player also does HDR->SDR which might be similar/identical to the settings you used.
+ media player are often not that good running in parallel and using video overlays.

Cu Selur