[FFmpeg-trac] #11408(avfilter:new): loudnorm performance improvement

[FFmpeg]

#11408: loudnorm performance improvement
-------------------------------------+-------------------------------------
             Reporter:  guillaumekh  |                     Type:
                                     |  enhancement
               Status:  new          |                 Priority:  minor
            Component:  avfilter     |                  Version:  git-
             Keywords:  loudnorm     |  master
  loudness performance ebur128       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 **Summary of the bug:**

 The loudnorm audio filter is slow.

 On my M2 Max MacBook Pro running FFmpeg 7.1, it typically reaches 25-35x
 speed.

 Some other ITU1770 implementations manage better throughput. I’m currently
 aware of the following implementations :
 - [https://github.com/jiixyj/libebur128 libebur128] (C library) : similar
 to FFmpeg's loudnorm
 - [https://github.com/sdroege/ebur128 ebur128] (Rust port of libebur128):
 reportedly only moderately faster than libebur128
 [https://github.com/jiixyj/libebur128/issues/122#issuecomment-1145974074
 according to authors]
 - [http://pbelkner.de/projects/web/bs1770gain/ bs1770gain]: ≈100x faster
 than realtime
 - Adobe Audition: takes the crown, at ≈275x faster than realtime

 How to reproduce:
 {{{
 % ffmpeg -i sometestaudiofile -vn -af loudnorm -f null /dev/null
 }}}

 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11408>
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