Re: Coreaudio-api Digest, Vol 4, Issue 93
Re: Coreaudio-api Digest, Vol 4, Issue 93
- Subject: Re: Coreaudio-api Digest, Vol 4, Issue 93
- From: Dominic Feira <email@hidden>
- Date: Fri, 30 Mar 2007 16:41:24 -0400
* Summary of Problem:
When playing multiple audio files, a user reports drop-outs lasting from ~0.1 to ~1 second, usually around ~.5. The dropouts manifest across all files and all output channels simultaneously.
* Hardware / OS / file specs:
Dual 2.7GHz G5 with 4G RAM
OS 10.4.8 and 10.4.9 (Drive wiped clean, reinstalled OS to ensure clean system.)
<snip> When trying to recreate a similar system to test first-hand, I used:
1.25 GHz PowerPC G4 (1 CPU), 1 GB RAM (PowerBook) Firewire MOTU UltraLight
Strangely, I am getting no dropouts on my less powerful machine.
One thing to keep in mind with the G4s, is that their clock speed isn't skewed like a G5. It is always 1.25GHz. As I understand it the adjustment of clock speed on the G5 (which you can't disable) can take a relatively long time to occur. Real-time apps sometimes run "better" on G4s because of this. I'm sure the core audio guys can fill you in on this as they have to deal with it for their predictive audio callback scheduler.
This might not be part of your problem at all. I just thought I'd mention it.
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