[FFmpeg-trac] #6574(swscale:new): ffmpeg butchers video quality when downscaling

[FFmpeg]

#6574: ffmpeg butchers video quality when downscaling
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             Reporter:  birdie      |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  critical    |                Component:  swscale
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by birdie):

 When encoding a single image using

 {{{
 ffmpeg -i source.png -vf scale=768x342:flags=lanczos result.png
 }}}

 The problem disappears (the colors are slightly off though). It's only
 when encoding the entire video there's this issue.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6574#comment:4>
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