[MLA] Fwd: Information about loudness normalization

[Grimm | Eelco]

This is very encouraging news:

I had found a "Rite of Spring" album on Apple Music that clipped when using album normalization. It turned out that during some limited time there had been an error in the peak calculation algorithm and a couple of hundred albums had been affected by that when they were ingested. Please keep this confidential. But my presentation of last year should have mentioned this.

The really interesting part is this: Buddy just sent me the afinfo data of the recalculated album. And look: they now include 1770-style loudness!!! I am really becoming optimistic that my -14 LUFS album normalization recommendation will be adopted by Apple Music...

I wonder what "aa" means...

Cheers,
Eelco


> Here’s the old data (from afinfo in Terminal):
> 
> Loudness Info:
>     sound check info                 :
>         sc ave perceived power coeff     : "705 775"
>         sc max perceived power coeff     : "3978 4854"
>         sc peak amplitude msec           : "72075 69846"
>         sc max perceived power msec      : "69846 69846"
>         sc peak amplitude                : "25902 26583"
> 
> 
> sound check volume normalization gain: 1.00 dB
> and here’s the new data (which includes 1770-style loudness info too):
> 
> 
> Loudness Info:
>     sound check info                 :
>         sc ave perceived power coeff     : "754 691"
>         sc max perceived power coeff     : "7607 8119"
>         sc peak amplitude msec           : "71866 71843"
>         sc max perceived power msec      : "71912 71935"
>         sc peak amplitude                : "31906 28628"
> 
>     main loudness parameters         :
>         aa ebu max momentary loudness    : -8
>         aa ebu top of loudness range     : -12
>         aa itu sample peak               : -0.21875
>         aa itu true peak                 : -0.1875
>         aa ebu max short-term loudness   : -10
>         aa itu loudness                  : -16
>         aa ebu loudness range            : 15.5
> 
> 
> sound check volume normalization gain: -0.81 dB

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