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Re: [fluid-dev] Re: An evil screeching noise when playing

From: Josh Green
Subject: Re: [fluid-dev] Re: An evil screeching noise when playing
Date: Thu, 13 Oct 2005 13:53:27 -0700

On Thu, 2005-10-13 at 18:36 +0300, Kimmo Sundqvist wrote:
> Toby wrote:
> > Can you investigate further?
> I installed 1.0.5 and played Overture to a New World by Chris Tilton.  The 
> problem is repeatable, not dependent on the used soundfont (tried Unison and 
> Merlin 22MB, and experienced it with both) or system load patterns.
> The CPU usage, as shown by top, is 99% all the time, music or not, soundfont 
> loaded or not, and I experienced no skipping.
> I did not experience Fluidsynth going totally berserk, but it segfaulted once 
> when I killed pmidi.
> The screech comes at certain points in the song.  Imagine a wave hitting a 
> rocky shore, but instead of water swooshing, imagine a sound much like a 
> broken MP3 (with continuous CRC errors, with blips indistinguishable from 
> each other, but no skips).  That is exactly how it sounds in the Overture.  
> The envelope of the noise rises and decays exactly like a wave hitting a 
> shore.
> And it is not mathematical random noise, like one gets with
> cat /dev/urandom > /dev/dsp
> My ALSA is 1.0.9
> Is it possible that there is a subformat of .sf2 or a format of compressed 
> samples that Fluidsynth doesn't support?  This would be an odd coincidence, 
> because changing the soundfont didn't change the noise in any way.
> Playing a midi file with no soundfont loaded results in total silence.  Again 
> Fluidsynth takes 99% of a CPU, but no noise (and no music) comes out.
> -Kimmo S.

The rest of your problems are likely related to the 100% CPU usage.
This is not normal behavior for FluidSynth.  Have you tried building
from a tarball with just the default settings (don't enable anything
fancy)?  Best regards,
        Josh Green

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