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<p>Ian, it's been a while since I performed this test. I would have
to retest to be sure, but to the best of my recollection, <b>the
clipping is ONLY on the repro side and only when converted to
fixed point.</b> Remember that all the codecs (both encode and
decode side) are 32 bit floating point. <br>
</p>
<p>If you run an attenuator in the floating point domain after the
decoder, you can fix any over issues which would manifest as
clipping when converted to fixed. Test it yourself. Run Apple's AU
lab with the round trip codec and Bitter placed in critical
places. <br>
</p>
<p>Then put a 24 bit dithering plugin and run a distortion test on a
sine wave to make sure it's not an illusion. If you guys don't
perform this test before the weekend, I'll try to do it myself
again. <br>
</p>
<p><br>
</p>
<p>Best wishes,<br>
</p>
<p><br>
</p>
<p>Bob</p>
<br>
<div class="moz-cite-prefix">On 10/7/18 7:39 PM, Ian Shepherd wrote:<br>
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<blockquote type="cite"
cite="mid:6B53EC47-F16D-4FB3-B502-AB894D6CA471@mastering-media.co.uk">
<pre wrap="">
Hi All !
My recent blog post about lossy encode clipping has had quiet a bit of attention:
<a class="moz-txt-link-freetext" href="http://productionadvice.co.uk/spotify-upload-true-peak/">http://productionadvice.co.uk/spotify-upload-true-peak/</a>
Including an email from Robert Bleidt @ Fraunhofer. He’s asking if I have specific examples of encodes that have “baked in” the clipping, because his position is that it shouldn’t happen, these days.
I’d like to give him a helpful reply and I’ve experienced problems myself in the past with encoding from Logic and Audacity, for example, but the truth is I don’t have a collection of examples on hand to offer him.
Do any of you have recent examples that I can point him at, or know for sure of current encoders that consistently have issues with extremely loud content ?
Thanks for any suggestions,
Ian
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