Re: [pygame] Pygame Mixer Crackle noise not an SDL_Mixer problem

["etrek" <etrek@xxxxxxx>]

Hi,
I uploaded my example SDL/SDL_Mixer source code and media files to here:
http://www.filejumbo.com/Download/3F840964D8B19B91

The folder is called wavIt.zip.  There is a README file included.
As I said, this program produces no crackling on my Vista32 machine,
whereas the equivalent Pygame program does.  Even a much simpler
program like jukebox.py from Book Chap 10 with no animation causes the 
crackling.

Thanks,
Ethan


----- Original Message ----- 
From: "René Dudfield" <renesd@xxxxxxxxx>
To: <pygame-users@xxxxxxxx>
Sent: Thursday, April 17, 2008 11:15 PM
Subject: Re: [pygame] Pygame Mixer Crackle noise not an SDL_Mixer problem


> hi,
>
> did your rewritten scripts use video?  Or just sound?
>
> Do you have a url for your scripts somewhere?
>
>
> cheers,
>
>
>
> On Fri, Apr 18, 2008 at 4:03 PM, etrek <etrek@xxxxxxx> wrote:
> > Hello Pygame developers:  Please read entire message before assuming 
> > you've
> > heard this before:)
> >
> > I am a new user of Pygame.  I have the book "Beginning Game Dev with 
> > Python
> > and Pygame". So far I am very impressed with Pygame;  It has excellent
> > graphics response and input capabilities.  The sound Mixer library has
> > problems though.
> >
> > When I tried the examples in Chapter 10 "Making Things Go Boom",  I 
> > noticed
> > a "Crackling" noise when playing sound effects (short wav files) and 
> > music
> > (long Ogg files).
> >
> > I have searched the archives at Seul.org  and searched on Google for 
> > fixes
> > to this problem.  The solutions suggested basically amount to changing
> > arguments passed into:  pygame.mixer.pre_init(...)
> > I tried many different settings:
> > pygame.mixer.pre_init(44100, -16, 2, 4096)
> > pygame.mixer.pre_init(22050, -16, 2, 4096)
> > pygame.mixer.pre_init(22050, 16, 2, 1024 * some_number)
> > Too many to keep listing.
> > I also tried leaving the settings at default, which actually produces the
> > least amount to crackling.
> >
> > I played the music/sound files with Windows Media Player to rule out my
> > system or bad files.  There was no crackling there.
> >
> > On some of the Google searches, I saw that people were pointing to the
> > problem being in the actual SDL_Mixer.
> >
> >
> > So I downloaded SDL/SDL_Mixer extension and re-wrote the example scripts 
> > in
> > SDL/C++, using the same music/sound files.
> > To my surprise, there was NO Crackling noise.
> >
> >
> > So,  the problem is NOT my system, it's not the arguments I'm passing 
> > into
> > pygame.mixer, and it's not SDL_Mixer.
> > The problem has to be somewhere in the Pygame Sound/Music libraries.
> >
> > I even tried swapping out the SDL_Mixer libs that came with Pygame for 
> > the
> > ones that came with SDL_Mixer, and still got the crackling in Pygame.
> >
> > It would be nice if this could be fixed.  Because the crackling is
> > essentially making the library unuseable.  Which would be a shame, 
> > because
> > Pygame is a terrific library/tool.
> >
> > Thanks,
> > Ethan D.
> > Systems Programmer, SR.
> > Planetary Lab, Univ Arizona
> >
> > My System:
> > Windows Vista 32bit home premium
> > IP35-Pro mobo, integrated sound, latest drivers
> > 4 Gig RAM
> > Intel Quad core