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

FFmpeg trac at avcodec.org
Sat May 10 08:59:25 CEST 2014

#3625: Unscaled conversion from yuv420p to gray is slow
             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           |

Comment (by andreasg):

 I don't really understand the question about setting the range.  I still
 kind of consider it to be a bug that converting YUV to gray takes that
 long with sws_scale.  However, this conversation has been very helpful for
 me in understanding some FFmpeg internals so that I can work around this

 You can close the bug if you think that this is the intended performance.

Ticket URL: <https://trac.ffmpeg.org/ticket/3625#comment:11>
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