[FFmpeg-trac] #4017(avfilter:new): noise filter breaks when combined with scaling

FFmpeg trac at avcodec.org
Tue Oct 14 13:43:53 CEST 2014

#4017: noise filter breaks when combined with scaling
             Reporter:  rmk         |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avfilter
              Version:  git-master  |               Resolution:
             Keywords:  noise       |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |

Comment (by rmk):

 I am attaching screenshots clipped out of the output, so you see what I
 mean. The difference is not subtle. When using yuv420p and mpeg4, the
 noise pattern is as expected. So it may be a side-effect of implicit pixel
 format conversions but someone else should make that analysis as i am only
 guessing here.

 Command lines used:

 ffmpeg -f lavfi -i testsrc=s=3840x2160 -vf
 format=pix_fmts=yuv422p10le,noise=c0s=10:allf=t -vcodec prores -q:v 0 -t 1


 ffmpeg -f lavfi -i testsrc=s=3840x2160 -vf
 format=pix_fmts=yuv420p,noise=c0s=10:allf=t -vcodec mpeg4 -q:v 0 -t 1

Ticket URL: <https://trac.ffmpeg.org/ticket/4017#comment:3>
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