[FFmpeg-trac] #5864(avformat:new): Add support for MP42 major brand

[FFmpeg]

#5864: Add support for MP42 major brand
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             Reporter:               |                     Type:
  AssemblerX86                       |  enhancement
               Status:  new          |                 Priority:  normal
            Component:  avformat     |                  Version:
             Keywords:  mp42,        |  unspecified
  major, brand                       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 Add support for MP42 major brand to LibAV since it has more support among
 media players.

 How to reproduce:
 {{{
 Mux an MP4 file using Libavformat
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/5864>
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