[FFmpeg-trac] #5253(undetermined:new): In vidstabtransform filter the zoomspeed option does not work

[FFmpeg]

#5253: In vidstabtransform filter the zoomspeed option does not work
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             Reporter:  TomSteck     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
  vidstabtransform zoomspeed         |  Reproduced by developer:  0
  libvidstab                         |
             Blocking:               |
Analyzed by developer:  0            |
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 Summary of the bug: I try to stabilize various videos and I am checking
 different vidstabtransform options. I can confirm that optzoom=2 option
 works (dynamic zoom) but the zoomspeed option doesn't.

 First I stabilized video with zoomspeed = 0.01 (min value), then I
 stabilized the same video with zoomspeed = 5 (max value). Finally I
 compared two videos with kdenlive "difference" transition and there was no
 difference (black screen). Therefore, my conclusion is that zoomspeed
 option doesn't work.

 How to reproduce:
 {{{
 % ffmpeg -i input -vf
 vidstabtransform=input=input.xml:interpol=bicubic:smoothing=100:optzoom=2:zoomspeed=5
 -vcodec libx264 -level 4.2 -preset veryslow -tune film -crf 23 -an output
 ffmpeg version N-77953-gcc83177
 built with gcc 5.2.0 (GCC)
 ffmpeg-20160119-git-cc83177-win64-static.7z
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5253>
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