[FFmpeg-trac] #4614(undetermined:new): sws_dither arguments aren't affecting output in colorspace conversion

FFmpeg trac at avcodec.org
Fri Jun 12 17:52:49 CEST 2015


#4614: sws_dither arguments aren't affecting output in colorspace conversion
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             Reporter:  surfdog2020  |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  2.6.3        |  undetermined
             Keywords:  sws_dither   |               Resolution:
  dithering                          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by surfdog2020):

 I'm looking to be able to specify the dithering algorithm used. I tried:
 ./ffmpeg -v debug -sws_flags +accurate_rnd+full_chroma_inp+full_chroma_int
 -y -i /mnt/storage/ProRes_10bit_422.mov -t 30 -pix_fmt yuv420p -an
 -threads 36 -vf scale=1920:-1:sws_dither='''a_dither'''
 mnt/storage/raw_8bit_420_adither.yuv

 ./ffmpeg -v debug -sws_flags +accurate_rnd+full_chroma_inp+full_chroma_int
 -y -i /mnt/storage/ProRes_10bit_422.mov -t 30 -pix_fmt yuv420p -an
 -threads 36 -vf scale=1920:-1:sws_dither='''bayer'''
 mnt/storage/raw_8bit_420_bayer.yuv

 Both output files are still equal to each other, have the same md5 value.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4614#comment:7>
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