[FFmpeg-trac] #9915(undetermined:closed): gblur sigma=0 vs sigmaV=10

[FFmpeg]

#9915: gblur sigma=0 vs sigmaV=10
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             Reporter:  Jozef        |                    Owner:  (none)
  Chutka                             |
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:  wontfix
             Keywords:  gblur        |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Michael Koch):

 With gblur=sigma=1:sigmaV=5 it's not a purely vertical blur. It has a
 small horizontal blur component.

 ffmpeg -f lavfi -i color=black:s=50x50 -vf
 drawbox=w=1:h=1:x=25:y=25:color=white,gblur=sigma=1:sigmaV=5,colorlevels=rimin=0:gimin=0:bimin=0:rimax=0.1:gimax=0.1:bimax=0.1
 -frames 1 -y out.png

 Purely horizontal blur does work fine: gblur=sigma=5:sigmaV=0
 It sounds logical that purely vertical blur should also work, but it
 doesn't: gblur=sigma=0:sigmaV=5
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Ticket URL: <https://trac.ffmpeg.org/ticket/9915#comment:6>
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