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IDProjectCategoryView StatusDate SubmittedLast Update
0002355DCP-o-maticFeaturespublic2022-10-17 23:252025-01-31 12:56
Reportercarl Assigned Tocarl  
PrioritynormalSeverityminorReproducibilityN/A
Status acknowledgedResolutionopen 
Target Version2.18.x 
Summary0002355: Add a tonemapping filter to make Rec.2020 sources look better
Description

I'm not sure if this is necessary (or even a good idea) but let's see if we can find somebody to test some Rec2020 material and see.

TagsNo tags attached.
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Estimated weeks required
Estimated work required

Relationships

related to 0002318 closedcarl Messed up colours with "HDR" yuv420p10le source 
related to 0002287 acknowledgedcarl Support UHD BluRay / HDR 

Activities

carl

2022-10-23 20:32

administrator   ~0005274

Tester has used a 4K Barco projector, and compared HDR sources with HDR sources converted to SDR with FFmpeg:

ffmpeg -i INFILE -map 0:0 -map 0:1 -vf zscale=t=linear,tonemap=hable,zscale=p=709:t=709:m=709 -c:v hevc_videotoolbox -b:v 70000k -profile:v main10 -c:a copy OUTFILE

and reports that DCPs made from the HDR source are not dark enough and lack saturation (which is similar to what is wrong with the preview).

carl

2022-10-23 20:35

administrator   ~0005275

Also notes that 4K HDR encodes took about twice as long as the SDR ones, which is odd.

Kurville

2023-09-19 18:26

reporter   ~0005953

The FFmpeg conversion that I use now is:
ffmpeg -i INFILE -map 0:0 -map 0:1 -vf zscale=t=linear, tonemap=hable,zscale=p=2020:t=2020_10:m=2020_ncl -c:v hevc_videotoolbox -b:v 70000k -profile:v main10 -c:a copy OUTFILE

And force Rec. 2020 in DOM colour setting.

Colour are better, a bit more saturated and without the slight yellow shift I noticed last year with my initial FFmpeg conversion.

Issue History

Date Modified Username Field Change
2022-10-17 23:25 carl New Issue
2022-10-17 23:25 carl Assigned To => carl
2022-10-17 23:25 carl Status new => acknowledged
2022-10-17 23:25 carl Relationship added related to 0002318
2022-10-23 20:32 carl Note Added: 0005274
2022-10-23 20:35 carl Note Added: 0005275
2023-09-16 21:17 carl Target Version 2.16.x => 2.18.x
2023-09-19 18:26 Kurville Note Added: 0005953
2024-01-08 20:59 carl Relationship added related to 0002287