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Old 11-16-2013, 09:53 AM
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Arno Peeters Arno Peeters is offline
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Default Inverse clipping with consolidating crossfades...

Haven't seen this before: I was compiling a short music-mix for a friend of mine (some imported mp3's, some CD-tracks) and after stitching it all together, I consolidated the lot for export to CD. This is a PT11 HD Native session 44.1 @32bits.

See what happens: above the original cross, below the result of consolidation and below that an AS render with Waves' S1 along with some gain reduction, just for comparison.
Whether I use Reverse or Gain (-0,1 dB), the clipping still occurs. This is not one, but there a several instances in this session.

I reinstalled PT11 and this is on a newly build-up Mountain Lion system (clean), because of the problems with Mavericks.

Anyone seen this before? Any clue where to get this solved?
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Last edited by Arno Peeters; 11-17-2013 at 06:08 AM.
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Old 11-16-2013, 02:05 PM
Andi R Andi R is offline
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Default Re: Inverse clipping with consolidating crossfades...

can you actually hear it?

I have never seen this, sorry I am no help here....
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Old 11-16-2013, 02:09 PM
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Default Re: Inverse clipping with consolidating crossfades...

First time also, that I see that myself.
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Old 11-16-2013, 11:30 PM
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Default Re: Inverse clipping with consolidating crossfades...

Yes, definitely clipping. But the phase invert is also weird. The tracks weren't that loud (lowered some with clip gain), but in any case: this should not happen.
Drive is healthy, permissions set to 'ignore'.
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Old 11-17-2013, 12:49 AM
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Default Re: Inverse clipping with consolidating crossfades...

Have you tried refreshing the waveform? Select the clip in the Edit window or Clip List > Clip list pop up > Recalculate Waveform Overviews:



It might be worth a try.

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Michael Wagener 25th July 2005, 02:59 PM

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Old 11-17-2013, 06:06 AM
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Default Re: Inverse clipping with consolidating crossfades...

Yes, did that. Also found out that a few WAV-files were still residing on my system-drive (sorry, sorry), but after copying those, deleting unused, recalculating waveforms and even changing the crossfades slightly, the clipping still keeps occurring... Never seen this kinda extreme behavior, at least not on a healthy system and drive...

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Old 11-17-2013, 12:12 PM
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Default Re: Inverse clipping with consolidating crossfades...

Quote:
Originally Posted by Arno Peeters View Post
Avid? Reading along?
I'd call that a bug. The best way to get it attention is to report it here with reproducable steps.

Shane
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Michael Wagener 25th July 2005, 02:59 PM

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Old 11-17-2013, 04:22 PM
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Default Re: Inverse clipping with consolidating crossfades...

Is elastic audio in use?
I've had issues that I could clear up by selecting all unused and clearing from session which then gives you the clear undue cache opportunity. (Consolidating EA tracks with x-fades)

Have you tried removing the WaveCache from the sessions folder prior to opening?
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Old 11-17-2013, 06:07 PM
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Default Re: Inverse clipping with consolidating crossfades...

Did you try AS DC Offset?

I've seen this in the past, and DC Offset corrected

Sometimes I could hear it (before correction) and sometimes I could not hear it - as if it were simply a graphical anomaly....

Though, I am led to believe that something is actually going on here, as, at times I could hear it

Even in those cases I could not, the graphical appearance of the waveforms were the same or dang close - so I presumed some sort of phasing issue

I have the S1's and I have not gotten this with them when used as inserts

I can try them AS tomorrow to see if I can replicate

If you'd like, please email me at : shortyemcee via gmail

Also, please let me know specifically which S1 you are using (Mine are version 9 latest revision and I have them all)

Also, if you would like, if you want to send me that short clip - attach as wav/mp3 and I can even try with the same audio

PT11.0.2 HD on latest OS ML on MacPro via HDN & HD I/O 16 on my end
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Old 11-18-2013, 01:53 AM
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Default Re: Inverse clipping with consolidating crossfades...

No, did not try DC-offset and no elastic audio is used: it is a straight on quick music-mix for a friends' welcoming party. And for clarity: the Waves S1 has nothing to do with the issue. It's just that used an alternative form of AS-processing with gain reduction to see whether clipping would still occur. Even reversing the part will keep the clipping in place.
I tried several things to see how long this bug would last, including saving a fresh copy, compacting and finally saving it from WAV to AIFF: it keeps in place.

So main question is: if there IS clipping, because two adjacent files summed would incur distortion, shouldn't that also be visible in the fades? And if not, why does processing bring this to light? It's no visual artifact, it is clearly clipped audio and hearable as such.

I think indeed I'll post this as a bug...
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