[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:16 spookybathtub]:
 > Alright, tried that.  The RGB conversion is not the problem.  The
 following commands produce identical files, both of which look different
 than DaVinci's:
 > {{{
 > ffmpeg -i J001C031_140110_R6MS.mov -an -vcodec v210 -vf
 "lut3d=file=LogC_to_709.dat" Jv210-LUT.mov
 > ffmpeg -i J001C031_140110_R6MS.mov -an -vcodec v210 -vf
 "format=pix_fmts=rgb48le, lut3d=file=LogC_to_709.dat,
 format=pix_fmts=yuv422p10le" Jv210-rgb-yuv-LUT.mov
 > }}}

 Is LogC_to_709.dat an identity LUT (no change to the visuals)?

 Do some comparison without lut3d at all (or with an identity lut3d, aka no
 change): just -vf "format=pix_fmts=rgb48le,format=pix_fmts=yuv422p10le"

 > One other variable here is that DaVinci works in 32 bit float.  Perhaps
 that accounts for the difference?

 FFmpeg as well

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Ticket URL: <https://trac.ffmpeg.org/ticket/2847#comment:17>
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