[FFmpeg-trac] #11438(avfilter:open): vf_crop filter breaks setting variables like x=x+1

[FFmpeg]

#11438: vf_crop filter breaks setting variables like x=x+1
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             Reporter:  Alan Amaral  |                    Owner:  Gyan
                 Type:  enhancement  |                   Status:  open
             Priority:  normal       |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:  crop         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  1            |
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Comment (by Alan Amaral):

 It would also be great if there was a way to change X and Y at the same
 time.  My current use case shows a stair-step effect when I pan diagonally
 because I have to step in the X direction, then the Y direction.
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Ticket URL: <https://trac.ffmpeg.org/ticket/11438#comment:2>
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