[FFmpeg-trac] #9316(undetermined:new): nnedi af mode causes flicker at top and bottom row

[FFmpeg]

#9316: nnedi af mode causes flicker at top and bottom row
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             Reporter:  Tom B        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 I'm using the following filter:

 -vf nnedi=weights.bin:all:af

 This generally works great, however, when converting 50i to 50p footage it
 causes a flicker at the top and bottom field in most frames.

 It seems that odd frames are simply black. It would be good if it used a
 bob/weave here as the result is distracting. yadif=1 produces worse
 results overall (e.g. scrolling text looks horrible) but does not produce
 this same flicker.

 This doesn't just happen on PAL videos like this with a black half row at
 the top/bottom. It happens on any video when `af` is specified.

 Using `a` mode works fine but obviously drops 50% of frames.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9316>
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