[Libav-user] loudnorm filter and EBU R128 standard

Paul B Mahol onemda at gmail.com
Sun Feb 27 13:50:51 EET 2022

On Wed, Feb 5, 2020 at 10:33 PM Jiming Shi <jmshi.astro at gmail.com> wrote:

> Recently I'm looking into ways of doing audio loudness normalization and
> came across ffmpeg filter `loudnorm` .
> According to EBU R128 standard:  "measurement shall include a gating
> method as specified in ITU-R BS.1770" which requires a momentary
> measurement which is 400ms instead of the shortterm one (3sec) used in the
> loudnorm filter:
> https://github.com/FFmpeg/FFmpeg/blob/master/libavfilter/af_loudnorm.c#L473
> Did I miss  something here? And is there a way to make the change in
> ffmpeg?

That code part is used for dynamic mode, which is not part of standard.

> Jiming
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