[FFmpeg-trac] #9898(undetermined:closed): Different result using FFmpeg 5.1 and 5.0.1 with -color_trc log / log_sqrt

[FFmpeg]

#9898: Different result using FFmpeg 5.1 and 5.0.1 with -color_trc log / log_sqrt
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             Reporter:  gabriele_ls  |                    Owner:  (none)
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:  invalid
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Changes (by Balling):

 * status:  new => closed
 * resolution:   => invalid

Comment:

 log_sqrt is described in ITU-T H.273 and has nothing to do with Slog3,
 Slog2 or panasonic V-Log or Leica L-Log.

 Logarithmic transfer characteristic (100 * Sqrt( 10 ) : 1 range) is
 described here: https://www.itu.int/rec/T-REC-H.273-202107-I/en

 sLog3 is here: https://pro.sony/s3/cms-static-
 content/uploadfile/06/1237494271406.pdf

 L-Log is here: https://leica-camera.com/sites/default/files/pm-65977
 -210914__L-Log_Reference_Manual_EN.pdf

 You must use those, fully and correctly implemented here:
 https://github.com/colour-science/colour/pull/338

 NEVER USE 3DLUTs for this!! 3DLUTs are only for calibration.

 Use Davinci, it allows to just right click on file and select the transfer
 function.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9898#comment:3>
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