[FFmpeg-trac] #9453(undetermined:new): Overlay with negative x/y produces artefacts

[FFmpeg]

#9453: Overlay with negative x/y produces artefacts
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             Reporter:  Jozef        |                    Owner:  (none)
  Chutka                             |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  4.3.2        |               Resolution:
             Keywords:  overlay      |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Jozef Chutka):

 I am aware that there are other ways to accomplish what I am trying to do,
 but this piece of filter comes from large one and current form is the
 minimum needed to replicate the issue.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9453#comment:2>
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