[LAU] [Ardour] Offline export with OSC

Aurelien tyranorl at free.fr
Thu May 12 08:07:48 UTC 2011


On Tue, May 10, 2011 at 11:30:24AM -0400, Paul Davis wrote :
> On Tue, May 10, 2011 at 11:14 AM, Joe Hartley <jh at brainiac.com> wrote:
> > On Tue, 10 May 2011 10:51:26 -0400
> > Paul Davis <paul at linuxaudiosystems.com> wrote:
> >> the data path during export is EXACTLY the same as during normal
> >> playback except for the conversion to an integer format. since
> >> metering occurs before this, the data the metering displays is
> >> IDENTICAL to the data that would be seen during normal playback.
> >
> > It would seem to me that if the meters are checking their inputs
> > n times per second, then if an export is occurring and is running say
> > 3 times faster than real time, there is the possibility that a peak
> > could happen at a moment that the input isn't being checked, and thus
> > the peak levels could be reported differently during export than in
> > real time.  I wouldn't expect to see a huge difference in the reported
> > values, but I can see how this would happen.
> >
> > Does this make any sense, or have I misunderstood how the meters
> > get their values?
> 
> well, the numerical values should match because the actual "peak"
> values are based on all data since the last meter update. but its
> definitely true that the "graphical" part of the meters could be
> different for precisely the reason you mention on the other hand, if
> there *is* a difference, its mostly likely to be an error with
> metering and not with any difference in the data generated for export.

OK, not sure to have all understood, but, by the way, when speaking
about vu-meters, I obviously mean "numerical values". It's true that I
just trusted those values, and never compared them to the data generated
for export.

So, just to be sure, I just have to ignore values of meters (including
numerical ones?) when exporting, and refering to the ones appearing when
listening to my mixes before exporting?

By the way, I would have to retry (and I have no time for this today),
but I'm almost sure to have got different numerical values from one
"realtime listen" to another. I especially remember a session with a
zone in which I sometimes get huge saturation (+1dB or more), and the
time right after got -0.8dB. It was a very low dynamic region (metal
music), and I had to get it the loudest I could, and it was quite a
pain.


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-- 
Aurélien


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