[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
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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 |
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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
~/tmp/noise_422p10le_prores.mov
vs.
ffmpeg -f lavfi -i testsrc=s=3840x2160 -vf
format=pix_fmts=yuv420p,noise=c0s=10:allf=t -vcodec mpeg4 -q:v 0 -t 1
~/tmp/noise_420p_mpeg4.mov
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Ticket URL: <https://trac.ffmpeg.org/ticket/4017#comment:3>
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