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On 10/13/18 4:22 PM, Ian Shepherd wrote:<br>
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Another example of why we need lower normalisation reference levels sooner rather than later, though...!
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How about saying: "Lower normalization reference levels, no positive
gain and no peak limiting." <br>
<br>
It's amazing how the streaming services reinvent the wheel wrong
again and again and don't consult with experts like us. Even Dolby
got it right historically with Dialnorm always being a downward
normalization approach. Thanks to efforts of Thomas, Eelco and
others, some of the services are just beginning to listen to us. <br>
<br>
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. <br>
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<br>
Bob K<br>
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<blockquote type="cite"
cite="mid:AC3AD567-662C-4D8C-B598-324C511772A6@mastering-media.co.uk">
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Ian
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<pre wrap="">On 13 Oct 2018, at 17:35, Thomas Lund <a class="moz-txt-link-rfc2396E" href="mailto:thomas@lund.one"><thomas@lund.one></a> wrote:
Hi Bob,
That’s still an excellent example, and points to the danger of allowing positive gain, especially when having a bad limiter in the system.
cheers,
Thomas
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<pre wrap="">On 13 Oct 2018, at 18.21, Robert Ludwig <a class="moz-txt-link-rfc2396E" href="mailto:gatewaybob@mac.com"><gatewaybob@mac.com></a> wrote:
Hi Ian,
As you like to write about Loudness I wanted to give you something I came across before you joined the group.
We were once on the lookout for real world examples of tracks that needed boosting on iTunes Sound Check and that boosting would cause distortion I came across this example in my iTunes library.
Attached is a 5:26 Victoria Mullova & Kristian Beuldenhout Beethoven Violin Sonata movement on iTunes that peaks at -2.8 dBFS on the left channel at 4:26 on the 3 loud chords.
Sound Check says it needs to be raised to +8.8dB! It technically has 6dB of distortion at that peak if Sound Check was being used.
BS-1770 says it has a Program Loudness of -27.7, so if iTunes had used ITU as a measurement it would have raised it even more!
Best,
Bob Ludwig
<02 Victoria Mullova & Kristian Bezuidenhout.m4a>_______________________________________________
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