#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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