[FFmpeg-trac] #8785(avfilter:new): af_loudnorm: Limiter does not handle new peaks in ATTACK/RELEASE states

FFmpeg trac at avcodec.org
Sat Jul 11 16:25:46 EEST 2020


#8785: af_loudnorm: Limiter does not handle new peaks in ATTACK/RELEASE states
-------------------------------------+------------------------------------
             Reporter:  slomo        |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avfilter
              Version:  unspecified  |               Resolution:
             Keywords:  loudnorm     |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by slomo):

 I provided an analysis and solution above, you can follow it by reading
 the code. I worked on this a few months ago and don't have the sample
 anymore that caused the clipping and also didn't try reproducing it with
 ffmpeg but only noticed it while working on my own code, but it was very
 easy to reproduce with music and selecting a higher-than-default target
 loudness.

 I reported this here in case you want to fix it in your version of the
 code too. If there's no interest in that feel free to just close this
 issue.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8785#comment:2>
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