[FFmpeg-trac] #9633(undetermined:new): gblur ignores resized input

[FFmpeg]

#9633: gblur ignores resized input
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             Reporter:  Jozef        |                    Owner:  (none)
  Chutka                             |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  gblur        |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Jozef Chutka):

 Hi Michael,

 Thanks for the proposed workaround. I can see `eq` working ok with dynamic
 size, however `fillborders` or `colorchannelmixer` do not.

 With the proposed workaround `gblur` might blend transparent pixels (from
 overlay bg) into the main image and `fillborders` will be problematic as
 well.

 I would like to propose for `gblur` the following:
 - expressions for sigma and sigmaV with available n/t/iw/ih... variables
 (sendcmd works now but undocumented)
 - implement `eval=frame` so each frame is re-evaluated for expressions +
 dynamic input size
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9633#comment:7>
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