[pipmak-devel] Sound playback issue at >44.1kHz sample rate

[jcowen]

Hi Everyone,

I'm wondering if anyone has experienced sound playback distortion when
sample rates greater than 44.1kHz are in the game engine? This seems to
occur if the source files are at 48kHz for instance when converted to ogg,
and also when the engine pitches sounds up.

For instance, a 44.1kHz ogg file placed on the knobs in the demo project
building will distort/playback with digital artifacts when the knob is tied
to the pitch variable of that sound.

This is only occurring on the Mac OS 10.5. I have not had the opportunity to
check on Snow Leopard.

Thank you,
JC

[Christian Walther]

Post by jcowen
I'm wondering if anyone has experienced sound playback distortion when
sample rates greater than 44.1kHz are in the game engine? This seems to
occur if the source files are at 48kHz for instance when converted to ogg,
and also when the engine pitches sounds up.
For instance, a 44.1kHz ogg file placed on the knobs in the demo project
building will distort/playback with digital artifacts when the knob is tied
to the pitch variable of that sound.
This is only occurring on the Mac OS 10.5. I have not had the opportunity to
check on Snow Leopard.

I see no such issues here, with either 44.1 or 48 kHz files. All I hear
is a slight pop when the pitch changes between exactly 1.0 and >1.0,
otherwise playback is smooth and clear, even at varying pitch. This is
on a MacBookPro2,2 with 10.5.8.

One thing you could try is to use the system-provided OpenAL framework
instead of the one that comes with Pipmak (which is there because OpenAL
was only included in Mac OS from 10.4 on). To do this, right-click
(ctrl-click) on the Pipmak application and choose "Show package
contents". Navigate to Contents/Frameworks and move the folder
OpenAL.framework away (to your desktop or somewhere else outside of the
application package).

-Christian

[jcowen]

Post by Christian Walther

Post by jcowen
I'm wondering if anyone has experienced sound playback distortion when
sample rates greater than 44.1kHz are in the game engine?

One thing you could try is to use the system-provided OpenAL framework
instead of the one that comes with Pipmak (which is there because OpenAL
was only included in Mac OS from 10.4 on). To do this, right-click
(ctrl-click) on the Pipmak application and choose "Show package
contents". Navigate to Contents/Frameworks and move the folder
OpenAL.framework away (to your desktop or somewhere else outside of the
application package).

Thanks Christian! That solved it!

JC

[Christian Walther]

Post by jcowen
Thanks Christian! That solved it!

OK, good to know! That means I'll have to use a newer version of the
framework for the next release, rip it out altogether, or find a way of
using the system-provided one in preference to the built-in one.

-Christian