#2373: hqdn3d produces banding
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Reporter: sun | Type: defect
Status: new | Priority: normal
Component: avfilter | Version: git-master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Summary of the bug: the temporal denoiser of the hqdn3d filter produces
banding. This is mostly noticeable on fine gradients with low luma value
and some noise. Seems that the filter tries to clamp a pixel's value over
the time.
How to reproduce:
I have uploaded a short example raw file that will show banding in the
thicker parts of the tree. There is not much noise, but this shows that
some gradients get destroyed by the filter.
http://www.mediafire.com/?dyy3knfcbmh4ftr
{{{
% ffmpeg -i input -vcodec dnxhd -acodec copy -vb 120000k -vf
hqdn3d=0:0:8:8 output
ffmpeg version N-37943-gc87c2d0
built on N-37943-gc87c2d0
}}}
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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2373>
FFmpeg <http://ffmpeg.org>
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