[FFmpeg-trac] #10836(avfilter:new): ebur128: Support tracking max short term loudness

[FFmpeg]

#10836: ebur128: Support tracking max short term loudness
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             Reporter:  hsn       |                     Type:  enhancement
               Status:  new       |                 Priority:  normal
            Component:  avfilter  |                  Version:  6.1
             Keywords:  ebur128   |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 Delivery standard enforced by TV usually looks like:

 Audio:
 * 8 AES audio tracks with one audio channel each /24 Bit
 * EBU norm R128
 * Programme loudness: -23 LUFS +/- 0.5 LU
 * Maximum short term loudness: -18 LUFS (= +5 LU relative)
 * Maximum true peak level: -3 dBTP (= dBFS measured with oversampling true
 peak meter)

 ebur128 filter already supports short term loudness computation and
 printing per frame but it doesn't track maximum reached level and prints
 it in summary. Tracking highest short term loudness level is needed for
 making ebur128 filter usable for broadcast QA checks.
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Ticket URL: <https://trac.ffmpeg.org/ticket/10836>
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