[MLA] AES71 comments

[Bob Katz]

I think we'd have to bring in Dolby and other experts at least as 
consultants. I only understand the basics of Metadata so I'd be shooting 
in the dark.


Bob



On 6/6/18 5:01 PM, Kevin Gross wrote:
> We need to get this metadata thing sorted out. AES71 tells you when to 
> use metadata but it doesn't say exactly what it is, how to transport 
> it or what you should do with it. Is this something that we help could 
> flesh out?
>
> Kevin Gross - AVA Networks
>
> On Wed, Jun 6, 2018 at 1:22 PM, Bob Katz <bobkatz at digido.com 
> <mailto:bobkatz at digido.com>> wrote:
>
>     I'm in favor of any solution that lowers the recommended target!
>     But it's always interim.
>
>
>     -18 LUFS is 5 dB away from -23. It ought to be safe for the
>     majority of program with an emergency protection limiter, at least
>     for portable devices. But I would NOT recommend -18 LUFS target
>     for set top devices playing wide range program material on
>     loudspeakers. There's the rub and the need for metadata.
>
>
>     Bob
>
>
>
>     On 6/5/18 8:49 PM, Ian Shepherd wrote:
>>
>>
>>>     Maybe the solution for fallback in the absence of metadata on
>>>     portable devices we recommend a gain boost of 7 dB with a
>>>     protection limiter. Since it's music it's likely to have a PLR
>>>     of less than 16 dB so if it was normalized to -23 it would
>>>     hardly trigger the limiter. But without metadata how do you know
>>>     it's music? And if they normalize regular program to -23 it will
>>>     be too low for many portable devices, also.
>>>
>>>     Shit (excuse my French)
>>>
>>     We’ve settled on around -18 LUFS for my podcast, which is plenty
>>     loud on my (European) iPod with stock earbuds. Anecdotally the
>>     BBC seems to be similar, and also works works fine, for the most
>>     part.
>>
>>     We should look back through our notes for the meeting where the
>>     podcast providers joined in, Bob - from memory most of them had
>>     also settled on -16 or -18, I think.
>>
>>     I assume your concern is that raising normal program to -16 would
>>     trigger excessive limiting, Bob. Perhaps suggesting -18 (which is
>>     the median of the AES recommended range) for everything would be
>>     a workable compromise, when there’s no meta-data ?
>>
>>     Ian
>>
>>
>
>     -- 
>
>     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 <http://www.digido.com/> No trees
>     were killed in the sending of this message. However a large number
>     of electrons were terribly inconvenienced.
>
>

-- 

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 <http://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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