[MLA] Spotify’s plans

[Kevin Gross]

As Thomas would tell you, the same concern exists for driving a DAC. I
beleive fixed-point decode is also still common. This is also what the EBU
128 -2 dBTP recommendation is about.

If you're going to be doing lossy compression, I guess you don't need to be
worried about losing bit transparency by attenuating first.

Kevin Gross - AVA Networks


On Tue, Nov 5, 2019 at 10:57 AM Bob Katz <bobkatz at digido.com> wrote:

>
> On 11/4/19 6:38 PM, Kevin Gross wrote:
>
> Since much of our audio processing is now done in floating point, I don't
> think clipping at the encoder is that big of an issue anymore. The problem
> is with the decoder which can produce higher peak levels than the signal
> sent into the encoder and that can cause clipping in the conversion to
> fixed point going to your DAC.
>
>
> If the encoder is driven with a sufficiently low signal, then the decoder
> will not clip. And that's a form of protection worth doing considering what
> might not be done well on the decode end.
>
>
> Bob
>
>
>
> Kevin Gross - AVA Networks
>
>
> On Mon, Nov 4, 2019 at 10:45 AM Bob Katz <bobkatz at digido.com> wrote:
>
>> Even if a master is softer than the highest target it could benefit from
>> attenuation to avoid codec clipping. If attenuation to avoid codec clipping
>> is their motivation then they could measure the max true peak level and
>> decide to attenuate based on that criterion.
>>
>>
>> Bob
>>
>>
>>
>> On 11/3/19 6:10 AM, Grimm | Eelco wrote:
>>
>> Why don't they just attenuate every song 3 dB and add metadata.
>>
>>
>> Because they don’t want to attenuate soft tracks that do not benefit from
>> attenuation. In other words: if your master is softer than the highest
>> target, they will not touch its original audio data.
>>
>> Cheers,
>> Eelco
>>
>>
>> Since they're planning on using metadata all the time in every player
>> then there's no reason to prenormalize any piece to any target. They didn't
>> get any advantage anyway.
>>
>>
>>
>> Bob
>>
>> --
>>
>>
>>
>> If you want good sound on your album, come to
>> Bob Katz 407-831-0233 DIGITAL DOMAIN MASTERING STUDIO
>> Author: *Mastering Audio*Digital Domain Website <https://www.digido.com/>
>>
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>>
>>
>>
>> If you want good sound on your album, come to
>> Bob Katz 407-831-0233 DIGITAL DOMAIN MASTERING STUDIO
>> Author: *Mastering Audio*Digital Domain Website <https://www.digido.com/>
>>
>> No trees were killed in the sending of this message. However a large number
>> of electrons were terribly inconvenienced.
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>
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> --
>
>
>
> If you want good sound on your album, come to
> Bob Katz 407-831-0233 DIGITAL DOMAIN MASTERING STUDIO
> Author: *Mastering Audio*Digital Domain Website <https://www.digido.com/>
>
> No trees were killed in the sending of this message. However a large number
> of electrons were terribly inconvenienced.
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