[FFmpeg-trac] #3625(swscale:new): Unscaled conversion from yuv420p to gray is slow

[FFmpeg]

#3625: Unscaled conversion from yuv420p to gray is slow
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             Reporter:  andreasg    |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  swscale
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by cehoyos):

 Replying to [comment:4 andreasg]:
 > I verified that the values in frame->data[0] and gray_frame->data[0] are
 the same when considering the respective linesize[0].

 This means that the output is not correct (there is a filter that produces
 this output iirc), yuv420p is MPEG-style scale, gray should be full scale.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3625#comment:5>
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