[FFmpeg-trac] #10987(avfilter:new): Blend video filter *_expr options don't handle store and load functions correctly.

[FFmpeg]

#10987: Blend video filter *_expr options don't handle store and load functions
correctly.
-------------------------------------+-------------------------------------
             Reporter:  Fallan       |                    Owner:  (none)
                 Type:  enhancement  |                   Status:  new
             Priority:  normal       |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:  "blend       |               Blocked By:
  filter" "store and load" st()      |
  ld()                               |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Comment (by Fallan):

 Some more information that might be useful:   I ran Michael Koch's
 simplified example using st and ld (with "-frames=25" to avoid error
 message) for ffmpeg versions 6.1, 5.1 and 4.4 and found the same
 problematic noisy result.   Also, I ran the recent version 7 master
 several times and got different random noise each time; feeding the
 outputs into hstack makes an easy comparison.

 So the "overwriting" of the stored variable is not systematic, it's as if
 its memory is mistakenly freed and used for some other things at random.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10987#comment:4>
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