Re: Clipping

Are we seeing different things on different OSs?  I'm on Win
XP. 
Leland may be on *nix (or maybe a mainframe) and Richard on
Mac?

If I'm right, it seems like Win and Mac are affected, *nix
not. 
Leland, do you see this problem elsewhere?  What about your
missus?

Martyn

Richard Ash wrote:
> On Fri, 2008-01-18 at 21:52 +0000, Richard Ash wrote:
>> On Wed, 2008-01-09 at 00:13 -0600, Leland wrote:
>>> On 1/6/08 7:51 PM, "Martyn Shaw"
<martynshaw99googlemail.com> wrote:
>>> Okay, so I enabled "Show clipping",
generated noise with a 30 minute
>>> duration, amplified it by 8dB (allowing
clipping) and hit OK.  The noise was
>>> amplified fine and I got a really nice red wave
on my display.  
>>>
>>> I'm able to scroll the display without issue as
well.  I do see that
>>> Audacity uses 100% of one of my CPUs while
scrolling, but it does go back
>>> down when I stop.
>>>
>>> So, I guess I'm not seeing the problem.  Any
other methods I might be able
>>> to use to reproduce?
>> Not a reproduction, but length-for-length enabling
show clipping is much
>> slower when reading from an original .WAV file than
from data stored in
>> audacity (not surprising). I'm already seeing about
2 seconds delay
>> using a 30 minute mono file at 22050 Hz. Note of
course that amplifying
>> the file to cause clipping copies the data into the
project folder,
>> which speeds things up.
> 
> OK, I should test these things more thoroughly. When I
have this file
> imported into audacity, and turn show-clipping on, the
CPU usage goes up
> to the roof and audacity gets very sluggish and
unresponsive. It doesn't
> actually lock up, but I suspect with a less responsive
system (I'm using
> 1000Hz kernel ticks) it would be pretty much the same
thing.
> 
> This is now 100% reproduceable:
> * Import uncompressed file, with the option to read
directly from them
> enabled.
> * Turn show clipping on.
> * See CPU usage go mad.
> 
> Richard
> 
> 
>
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On 1/18/08 6:33 PM, "Martyn Shaw"
<martynshaw99googlemail.com> wrote:

> Are we seeing different things on different OSs?  I'm
on Win XP.
> Leland may be on *nix (or maybe a mainframe) and
Richard on Mac?
> 
> If I'm right, it seems like Win and Mac are affected,
*nix not.
> Leland, do you see this problem elsewhere?  What about
your missus?
> 
I'll start looking into this tonight.  If I'm remembering
correctly, this
"may" not be easily correctable.  It's embedded
smack dab in the middle of a
heavily hit bit of code and the method of finding the clips
isn't very
optimized.  We'll see...

It's been very difficult remembering "the routine"
so I've only been looking
every so often.

My two main plats are OSX and Windows...though I don't get
to the latter for
anything but Audacity.  When I hit Linux, I use SuSE and
*buntu.

But, all of that is on different partitions and rebooting is
a pain in the
patootie, so once the new Mac Pro gets here, I'll be using
VMware Fusion to
do it all much easier.

The only thing I'm not sure of is I'll be keeping the PPC
Mac.  If I don't
then we're gonna have a heck of a time supporting the
non-Intel Macs.

Leland



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