[FFmpeg-trac] #11256(avfilter:new): How to use "curves" filter with "hwupload" in FFmpeg?

[FFmpeg]

#11256: How to use "curves" filter with "hwupload" in FFmpeg?
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             Reporter:  elias tsolis  |                    Owner:  (none)
                 Type:  task          |                   Status:  new
             Priority:  normal        |                Component:  avfilter
              Version:  7.0           |               Resolution:
             Keywords:  curves        |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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Comment (by elias tsolis):

 thanks! i search all over the internet and could find any example for
 that. Please, add it as an example to ffmpeg curves guid. It does not take
 too much time from your side, instead to search a whole day how to do it.

 Double quotes (") on outer ffmpeg command can make single quoted (')
 ffmpeg sub-operands to work very fine, inside these double quotes.

 For future reference, I place the whole command:

 {{{
 ffmpeg  -hwaccel vaapi -hwaccel_output_format yuv420p -vaapi_device
 /dev/dri/renderD128 -i vid_original.mp4 -vf "curves=all='0/0 0.8/0.8
 1/1',format=nv12, hwupload" -strict experimental   -c:v hevc_vaapi
 vid_copy.mp4
 }}}

 if I want to update ffmpeg guide, how I can do it?
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Ticket URL: <https://trac.ffmpeg.org/ticket/11256#comment:8>
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