Opened 4 years ago

Closed 4 years ago

#9845 closed defect (fixed)

gblur sigma=0 and sigmaV=0

Reported by: Jozef Chutka Owned by:
Priority: normal Component: undetermined
Version: unspecified Keywords: glbur
Cc: Jozef Chutka Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

Using latest ffmpeg (2022-07-24-git-39a538f430-full_build-www.gyan.dev), having parameter sigmaV=0 for filter glubr is causing video to disappear:

ffmpeg -i video.mp4 -vf "gblur=sigmaV=0" -y out.mp4

This is the minimal reproducible command and however it might look unreasonable, there are multiple reasons why you end up needing sigmaV=0:

  1. applying horizontal blur only sigma=10:sigmaV=0
  2. "animating" sigmaV via sendcmd=c='0 [expr] gblur sigmaV 100-N

Current workaround is to apply some low value sigmaV=0.001.

Slightly different issue appears when using sigma=0, which is causing vertical blur being ignored:

ffmpeg -i video.mp4 -vf "gblur=sigma=0:sigmaV=10" -y out.mp4

Workaround is to use sigma=0.001:sigmaV=10

Change History (1)

comment:1 by Elon Musk, 4 years ago

Resolution: → fixed
Status: new → closed

Fixed in 49a1de26ec6c358e5367ba1fb6e5828196626201
.

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