[FFmpeg-trac] #9037(undetermined:new): Add option to provide loudness information by way of a loudness box ('ludt')

[FFmpeg]

#9037: Add option to provide loudness information by way of a loudness box
('ludt')
-------------------------------------+-------------------------------------
             Reporter:  gordon       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 HLS calls for a loudness box:


 {{{
 2.19. In fMP4 files, you SHOULD provide loudness information by way of a
 loudness box ('ludt'). When present, the loudness box takes precedence
 over any loudness information in the audio stream.
 }}}

 Ref
 https://developer.apple.com/documentation/http_live_streaming/hls_authoring_specification_for_apple_devices

 FFmpeg can be used to normalize and provide this data
 (https://github.com/slhck/ffmpeg-normalize)

 It would be helpful if loudness metadata could be provided on the command
 line and then written to the 'ludt' loudness box when using the dash and
 hls output formats

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Ticket URL: <https://trac.ffmpeg.org/ticket/9037>
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