[FFmpeg-trac] #2559(avfilter:new): Bad pixel format negociation with scale and gray

[FFmpeg]

#2559: Bad pixel format negociation with scale and gray
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             Reporter:  ubitux      |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avfilter
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by ubitux):

 Replying to [comment:2 cehoyos]:
 > I don't think this is a valid ticket: FFmpeg tries to only insert the
 scale filter once and succeeds.
 I see 4 auto-inserted filters, in addition to the explicit scale filter.
 And that behavior is not expected anyway; if a user wants to reduce the
 amount of auto-inserted filter, it can pre-convert to gray.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2559#comment:3>
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