[FFmpeg-trac] #4980(avcodec:open): yuv444p hevc wrong resolution if x265 ultrafast was used for encoding

[FFmpeg]

#4980: yuv444p hevc wrong resolution if x265 ultrafast was used for encoding
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             Reporter:  psteinb       |                    Owner:
                 Type:  defect        |                   Status:  open
             Priority:  normal        |                Component:  avcodec
              Version:  git-master    |               Resolution:
             Keywords:  hevc libx265  |               Blocked By:
             Blocking:                |  Reproduced by developer:  1
Analyzed by developer:  0             |
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Comment (by kurosu):

 The bug concerning 320x248.hevc is probably in x265 (the ffmpeg wrapper
 doesn't seem to have this issue): they specify both a default display
 window in the VUI and a conformance cropping window in the SPS. Both
 contain a bottom offset of 8 to get from the coded size of 256 to the
 final display size of 248.

 But equations E-47 to E-50 say that the 2 shall be *summed* to produce the
 final offsets. So libavcodec correctly interprets the signalling as "crop
 the bottom 8+8 pixels".

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Ticket URL: <https://trac.ffmpeg.org/ticket/4980#comment:15>
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