[FFmpeg-trac] #8384(avcodec:new): incorrect help msg for -h decoder=ayuv

[FFmpeg]

#8384: incorrect help msg for -h decoder=ayuv
----------------------------------+----------------------------------
             Reporter:  gslayden  |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avcodec   |                  Version:  4.1.4
             Keywords:  ayuv      |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 Summary of the bug:
 How to reproduce:
 {{{
 % ffmpeg -h decoder=ayuv
 ffmpeg 4.1
 built on 20181017
 }}}

 Result of the command:

  V....D ayuv  Uncompressed packed MS 4:4:4:4

 According to the following website the planar format should be referred to
 as "4:4:4":

 https://docs.microsoft.com/en-us/windows/win32/medfound/recommended-8-bit-
 yuv-formats-for-video-rendering#ayuv

 Note that ffmpeg lists an extra ":4" in the help text for the decoder
 name.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8384>
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