[FFmpeg-trac] #10431(avfilter:new): Bug in lut3d.c

[FFmpeg]

#10431: Bug in lut3d.c
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             Reporter:  Michael Koch  |                    Owner:  (none)
                 Type:  defect        |                   Status:  new
             Priority:  normal        |                Component:  avfilter
              Version:  git-master    |               Resolution:
             Keywords:                |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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Comment (by Michael Koch):

 Replying to [comment:7 Elon Musk]:
 > Please cite specification to make this valid link. Not going to research
 whole specification from link for you, have not much that free time.

 It seems there exist two different syntax specifications:

 1.
 LUT_1D_INPUT_RANGE min max
 LUT_3D_INPUT_RANGE min max
 The first one is already implemented in lut3d.c, but clipped to wrong
 range in lines 1763 to 1765. For examples see
 https://forum.blackmagicdesign.com/viewtopic.php?f=21&t=40284

 2.
 DOMAIN_MIN rl gl bl
 DOMAIN_MAX rh gh bh
 For specification see chapter 5.6 in
 https://web.archive.org/web/20201027210201/https://wwwimages2.adobe.com/content/dam/acom/en/products/speedgrade/cc/pdfs
 /cube-lut-specification-1.0.pdf
 See also this implementation, beginning in line 142:
 https://github.com/JakubOchnik/Cube-LUT-
 Loader/blob/main/src/DataLoader/CubeLUT.cpp

 I'm not sure which of these two syntax versions is newer or older.
 Seems best if FFmpeg accepts both of them for compatibility.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10431#comment:8>
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