[FFmpeg-trac] #9772(avfilter:new): colorspace filter fails on trc=linear

[FFmpeg]

#9772: colorspace filter fails on trc=linear
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             Reporter:  Llyw         |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avfilter
              Version:  unspecified  |               Resolution:
             Keywords:  colorspace   |               Blocked By:
  conversion linear gamma            |
  resampling                         |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Llyw):

 Could you please elaborate? From what I understand, the `scale` filter
 won't convert to linear gamma before computing the resampled pixel value
 and that's why I am explicitly trying to convert to a linear transfer
 curve before the `scale` filter. And reapply a gamma function afterwards.
 (From what I understood, people are generally suggesting `zscale` because
 it is better at handling color space information, but I have given my
 reasons for not wanting to use it.) Are you suggesting that the `scale`
 filter can indeed convert to linear gamma internally? If so, what
 parameters do I have to specify for it to do so? Are `in_color_matrix` and
 `out_color_matrix` sufficient? And would that require git master or is the
 5.0 release branch sufficient?

 Note that the original issue that I reported, namely `colorspace` failing
 when trying to use `trc=linear`, still remains, but if I don't need the
 `colorspace` filters for the task at hand that would at least provide a
 solution for me, if not fixing the bug itself.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9772#comment:4>
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