Re: [Audacity-devel] [Fwd: Re: [Audacity-help] Re: Buzz when exporting to mp3 or wav]

[Dominic M. <do...@mi...>]

Markus Meyer wrote:
> These are the infos for my system:
> 
> [markus@markus markus]$ cat /proc/cpuinfo | grep "model name"
> model name      : Intel(R) Pentium(R) 4 CPU 2.26GHz
> 
> [markus@markus markus]$ gcc --version
> gcc (GCC) 3.2.2 20030222 (Red Hat Linux 3.2.2-5)
> 
> I never had a similar problem with any program I wrote so I'm totally
> lost on what may cause this.

I've seen this before.  I'll try compiling your program with
gcc 3 on a P4 at work and figure out what's going on.

Could you see if removing optimization fixes all resampling
problems in Audacity, too?

- Dominic


> 
> Markus
> 
> Am Mon, den 05.01.2004 schrieb Dominic Mazzoni um 13:04:
> 
>>Markus Meyer wrote:
>>
>>>The output I get is below (note how it reports 'nan' for some samples):
>>>
>>>[markus@markus libresample]$ tests/testresample
>>>resampling 1024 samples of silence
>>>used 1024 output samples
>>>number of output samples = 6145
>>>sum of output samples = nan
>>>some example samples:
>>>dst[42] = nan
>>>dst[43] = 0.000000
>>>dst[44] = 0.000000
>>>dst[45] = 0.000000
>>>dst[46] = 0.000000
>>>dst[47] = 0.000000
>>>dst[48] = nan
>>>dst[49] = 0.000000
>>>dst[50] = 0.000000
>>>dst[51] = 0.000000
>>>[markus@markus libresample]$
>>
>>On my machine:
>>
>> > tests/testresample
>>resampling 1024 samples of silence
>>used 1024 output samples
>>number of output samples = 6145
>>sum of output samples = 0.000000
>>some example samples:
>>dst[-1] = 0.000000
>>dst[0] = 0.000000
>>dst[1] = 0.000000
>>dst[2] = 0.000000
>>dst[3] = 0.000000
>>dst[4] = 0.000000
>>dst[5] = 0.000000
>>dst[6] = 0.000000
>>dst[7] = 0.000000
>>dst[8] = 0.000000
>>
>>I'm using gcc 2.96 (RH 7.x) on an Athlon 1.2 GHz.  I also have
>>access to a G4, and at work a Pentium III, Pentium IV, Athlon XP,
>>and more.  What processor and compiler do you have?
>>
>>BTW, definitely test without optimization, or with -O instead of
>>-O2.  I'll bet that will fix it.  Of course, since that source
>>file contains the main inner loop, it will also slow down
>>resampling, so that's obviously not the final solution.
>>
>>- Dominic
>>
>>
>>
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> 
> 
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