Re: Dropouts/Glitches with FW interfaces was Re: IOAudioStream[0x148cc00]::clipIfNecessary() - Error:
Re: Dropouts/Glitches with FW interfaces was Re: IOAudioStream[0x148cc00]::clipIfNecessary() - Error:
- Subject: Re: Dropouts/Glitches with FW interfaces was Re: IOAudioStream[0x148cc00]::clipIfNecessary() - Error:
- From: William Stewart <email@hidden>
- Date: Wed, 03 Nov 2004 14:52:36 -0800
Are the glitches at these lower buffer size conditions also occurring with
the built-in driver, or just with the M-Audio FW interface?
Bill
On 3/11/04 10:37 AM, "seb_plogue" <email@hidden> wrote:
> I did some more investigating with a M-Audio FW 410
> and the behavior I experience with Bidule is
> reproducible with both Live and Rax
>
> I chose Live because Stephan posted about his problems
> yesterday and Rax because from what I gather it's using AUGraph and
> the Audio Output Unit (which I guess should be the closest
> to a "perfect" implementation for accessing CoreAudio)
> All of these apps AFAIK would be making all the work for
> the requested buffer inside the IOProc using the same
> buffer size everywhere which would be different than some DAWs
> that would use different buffer size throughout the tracks
> depending on which one(s) have focus/external MIDI input.
>
> (All these done with an eMac G4/700 as it is easier to
> reach these cpu usages quickly)
>
> I get glitches/dropout if I set the buffer size to 256 and
> the cpu reaches about 70-something% (according to each app
> display, not using top/Activity Monitor), if I increment the
> buffer size to 512(or more), no glitches occur. If I use the
> built-in audio @ 256, no glitching there also.
>
> If I lower the buffer size to 128, it starts glitching
> way sooner (i'll say around the 50-something) and 64
> is even worse (40% or so)
>
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