[MLA] Loudness example with distortion on Sound Check

[Kevin Gross]

On Sun, Oct 14, 2018 at 8:32 AM Bob Katz <bobkatz at digido.com> wrote:

>
> In our recent conversations, I pointed out that it's totally impractical
> to expect or even talk about any streaming player applying attenuation to
> avoid overs just post the decode stage. Therefore even though the clipping
> is not baked into a well-made encoder, it has to be the responsibility of
> the mastering engineer to prevent decoder clipping by reducing the level
> that will be applied to the encoder if necessary. Mastering engineers have
> to bake that level into the fixed point file that we supply to the
> distributors.
>

If you want to fix this pre-encoder, you're going to get content producers
to comply with something like Spotify's -2 dBTP suggestion. That means
bringing peaks down 4-6 dB compared to where they currently stand at 0
dBFS. I don't see mastering engineers getting behind this. I don't know if
we even want to recommend it either because it will result in more
squashing.

We should also be raising awareness of the potential for clipping
post-encoder and advocating for more robustness in players in this regard.
You're right, we're not going to be able to get all decoders fixed. We're
also not going to be able to get all masters fixed. If we work both ends,
we'll make the most meaningful progress.

Kevin
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