[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
-------------------------------------+------------------------------------
             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            |
-------------------------------------+------------------------------------
Changes (by Gyan):

 * analyzed:  0 => 1
 * keywords:  vf_crop => crop
 * owner:  (none) => Gyan
 * status:  new => open
 * type:  defect => enhancement
 * version:  6.1.1 => git-master

Comment:

 Yeah, changing x and y through commands would need to be handled
 differently. Currently all commands are treated effectively as reinit of
 all filter state variables.

 I'll send a patch for this soon-ish.
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Ticket URL: <https://trac.ffmpeg.org/ticket/11438#comment:1>
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