[FFmpeg-trac] #4724(undetermined:new): support reporting on max variation in astats

[FFmpeg]

#4724: support reporting on max variation in astats
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               Reporter:  dericed    |                  Owner:
                   Type:             |                 Status:  new
  enhancement                        |              Component:
               Priority:  normal     |  undetermined
                Version:             |               Keywords:  astats
  unspecified                        |               Blocking:
             Blocked By:             |  Analyzed by developer:  0
Reproduced by developer:  0          |
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 Summary of the bug:

 I suggest adding a metadata value to the astats output to record the
 maximum variance in audio samples. The maximum variance would be the
 maximum absolute value of sample n minus sample n-1. This information
 could be useful to discover spikes, audio errors, edits, etc.

 Imagined use:
 {{{
 ffprobe -f lavfi movie=movie.mov:s=a,astats=metadata=1 -show_entries
 frame_tags=lavfi.astats.1.Max_variance
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/4724>
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