#11342: colorspace filter does not apply dither=fsb when in/out primaries is the
same
-------------------------------------+-------------------------------------
Reporter: Seb | Type: defect
Status: new | Priority: minor
Component: ffmpeg | Version: git-
Keywords: colorspace | master
dither dithering | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
I have 10bits BT.709 videos and i want to use colorspace filter to convert
to 8bits (personal choice over format filter).
The problem is that dither=fsb options does not work when output primaries
is the same as input.
This example does not apply any dithering :
{{{
% ffmpeg -i input -vf colorspace=all=bt709:format=yuv420p:dither=fsb [...]
}}}
But dither=fsb works with this workaround, by forcing a primaries
transformation (i used bt2020 but it could be anything).
{{{
% ffmpeg -i input -vf
zscale=p=2020,colorspace=all=bt709:format=yuv420p:dither=fsb [...]
}}}
Note:Dither is also disabled with fast=1
For now i can use my workaround, but this slows down the encoding by a lot
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11342>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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