[FFmpeg-user] using loudnorm only for true-peak limiting ?

[Marton Balint]

On Fri, 14 Sep 2018, Frédéric Busnel-Joncour wrote:

> Hi there,
>
> I sometimes need to adjust true-peak of audio files, only for small 
> corrections (from -0.7 to -1.0 for example), and leave everything else 
> unchanged. As there's no dedicated true-peak limiter in ffmpeg audio 
> filters (if I'm not wrong), I tried with loudnorm filter, but even when 
> entering same input and output Integrated and LRA values, there's some 
> corrections that are made. Is there any way to tell loudnorm to just 
> adjust true-peak and leave anything else unchanged ?

For this, do not use loudnorm, just resample the audio to 4*sample_rate, 
apply a traditional limiter (e.g. alimiter filter) and then downsample it.

Regards,
Marton