[FFmpeg-trac] #2847(avfilter:closed): 3D_LUT_Filter seems to work incorrect

[FFmpeg]

#2847: 3D_LUT_Filter seems to work incorrect
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             Reporter:  rainer fritz  |                    Owner:
                 Type:  defect        |                   Status:  closed
             Priority:  normal        |                Component:  avfilter
              Version:  git-master    |               Resolution:  fixed
             Keywords:  lut3d         |               Blocked By:
             Blocking:                |  Reproduced by developer:  1
Analyzed by developer:  0             |
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Comment (by ubitux):

 Replying to [comment:18 spookybathtub]:
 > When testing an identity cube LUT today, I got nearly perfect results.
 > I forgot about the `interp` option, that's probably a factor too.  If
 I'm not mistaken, the lut3d filter works in rgb48, which is 16
 bits/channel.  DaVinci works in 32 bits/channel, isn't that a key
 difference?
 >

 It's converted to 32 bits float for interpolation in lut3d. I have no idea
 what DaVinci is doing, and if it's more correct than what we do.

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Ticket URL: <https://trac.ffmpeg.org/ticket/2847#comment:19>
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