[FFmpeg-trac] #9132(ffmpeg:open): Wrong pixel format/output when converting video to yuv444p*

[FFmpeg]

#9132: Wrong pixel format/output when converting video to yuv444p*
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             Reporter:  viley       |                    Owner:  (none)
                 Type:  defect      |                   Status:  open
             Priority:  important   |                Component:  ffmpeg
              Version:  git-master  |               Resolution:
             Keywords:  regression  |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  0           |
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Comment (by Balling):

 You also said FATE tests should be done :)
 You are wrong that it is only zscale. It is not:


 -vf 'scale=out_color_matrix=bt709:out_h_chr_pos=0:out_v_chr_pos=128'

 The position is specified in the luma grid / 256, so for a 4x4 grid in
 4:2:0, 0:0 is center of the first pixel, 256:256 the last, and 0:128 is in
 the first column, between both rows - ie. mpeg2 position.

 HEVC type 2 should be 0:0 from what I can tell (ffmpeg calls this
 AVCHROMA_LOC_TOPLEFT).
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Ticket URL: <https://trac.ffmpeg.org/ticket/9132#comment:21>
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