using loudnorm only for true-peak limiting ?

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using loudnorm only for true-peak limiting ?

Frédéric Busnel-Joncour
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 ?


Best regards,

Fred

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Re: 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
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Re: using loudnorm only for true-peak limiting ?

Frédéric Busnel-Joncour
>> 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.


Thanks Marton, that makes sense.


Best regards,

Fred
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Re: using loudnorm only for true-peak limiting ?

Frédéric Busnel-Joncour
In reply to this post by Marton Balint
>> 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.


Thanks Marton, that makes sense.


Best regards,

Fred
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