12 May
2011
12 May
'11
10:35 a.m.
Excerpts from Aurelien's message of 2011-05-12 10:07:48 +0200:
On Tue, May 10, 2011 at 11:30:24AM -0400, Paul Davis
wrote :
You should try sndfile-info <exported_file>, it's a quick way to get the
real peak. Of course it would be nice if ardours metering was correct,
even on export.
On Tue, May 10, 2011 at 11:14 AM, Joe Hartley
<jh(a)brainiac.com> wrote:
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. On Tue, 10 May 2011 10:51:26 -0400
Paul Davis <paul(a)linuxaudiosystems.com> wrote:
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. 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?