[FFmpeg-trac] #7978(undetermined:closed): inaccurate conversion from YCbCr Narrow range to RGB Full range

FFmpeg trac at avcodec.org
Tue Aug 31 05:22:32 EEST 2021


#7978: inaccurate conversion from YCbCr Narrow range to RGB Full range
-------------------------------------+-------------------------------------
             Reporter:  cepesh       |                    Owner:  (none)
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:  invalid
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by Balling):

 * status:  new => closed
 * resolution:   => invalid

Comment:

 As was said downstream this is not a bug. https://github.com/sekrit-
 twc/zimg/issues/109


 {{{
 found that you must add 'format=gbrp16le' after 'zscale'. Otherwise,
 FFmpeg instructs z.lib to perform a no-op conversion from YUV to YUV, and
 instead uses its internal code to convert to RGB. After I did this, I
 verified that I got '38004' when converting from '572'. This bug(?) exists
 in FFmpeg, not z.lib.
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/7978#comment:4>
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