[FFmpeg-trac] #3469(avfilter:open): pullup crashes with gray8

[FFmpeg]

#3469: pullup crashes with gray8
-------------------------------------+-------------------------------------
             Reporter:  Timothy_Gu   |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:  crash        |               Blocked By:
  SIGSEGV pullup                     |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * keywords:  pullup => crash SIGSEGV pullup
 * status:  new => open
 * reproduced:  0 => 1


Comment:

 Reproducible with:
 {{{
 $ ffmpeg -f lavfi -i testsrc -vf format=gray,pullup -f null -
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/3469#comment:1>
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