[FFmpeg-trac] #2678(avfilter:new): Dscolored output with vf_gradfun and nv12 pixel format

[FFmpeg]

#2678: Dscolored output with vf_gradfun and nv12 pixel format
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             Reporter:  gjdfgh    |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avfilter  |                  Version:  unspecified
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 ```
 ffplay xtest720.mkv -vf format=nv12,gradfun=32:32,format=yuv420p
 ```

 My conclusion: vf_gradfun actually supports only strictly planar formats.
 nv12 is sort of half-packed (separate Y plain, but packed chroma), and
 maybe you normally don't see the bad effect on the crhoma so well.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2678>
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