[FFmpeg-trac] #9410(avfilter:new): Problem in vidstabtransform

FFmpeg trac at avcodec.org
Tue Sep 7 18:33:33 EEST 2021

#9410: Problem in vidstabtransform
             Reporter:  Michael      |                     Type:  defect
  Koch                               |
               Status:  new          |                 Priority:  normal
            Component:  avfilter     |                  Version:  git-
                                     |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
 It seems in the "vidstabtransform" filter the option "crop=black" doesn't
 work. Can be reproduced as follows:

 rem  Make a video with vertical jitter:
 ffmpeg -f lavfi -i testsrc2=d=10 -lavfi
 sendcmd=f=cmd.txt,rgbashift=rv=0:gv=0:bv=0 -y shaky.mp4

 The file cmd.txt contains these 3 lines:
 0 [expr] rgbashift rv 'mod(3*N,10)';
 0 [expr] rgbashift gv 'mod(3*N,10)';
 0 [expr] rgbashift bv 'mod(3*N,10)';

 rem  Stabilize the video:
 ffmpeg -i shaky.mp4 -lavfi vidstabdetect -y dummy.mp4
 ffmpeg -i shaky.mp4 -lavfi vidstabtransform=crop=black:optzoom=0 -y

 I would expect sometimes to see black borders.
 Either these areas are filled with other colors, or a zoom is active,
 which shouldn't be the case with optzoom=0.
Ticket URL: <https://trac.ffmpeg.org/ticket/9410>
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