I've managed to get it down to 15ms on a g4 1ghz powerbook with a motu828mkII .. but nothing below that. 12ms almost works.. but 10 and under are a complete mess.
is this because of portaudio on os x? or is there something i can do about it? i know that the motu will do 3-4ms with max/msp and reaktor, but not with pd.
matt.
From: plessas@sbox.tugraz.at Date: 2003/11/15 Sat AM 08:58:08 EST To: pd-list@iem.at Subject: [PD] latency
dear list,
who managed to run pd with less than 30 msec of latency? how do you do that?
i tried: osx on a g3 pismo (~500MHz) osx on a g3 pismo (~500MHz) using an rme/hdsp win2k on a P4 2.5GHz using asio and an rme/hdsp and nothing less than 30msec!
thanks for any replies!
peter_p
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How do you measure the latency on your machines ?
I tried to use the "latency.pd" patch in the "tools" folder, but the latency I get is usually about 340 ms, which looks wrong : when I route an incoming signal from [adc~] to [dac~] (a kind of audio bypass patch), I don't hear any latency between the direct source and the output. Therefore the latency of my computer should be at least lesser than 10 ms ; my sound card is set to 128 samples (3 ms)
Quoting julien.breval@tremplin-utc.net:
How do you measure the latency on your machines ?
I tried to use the "latency.pd" patch in the "tools" folder, but the latency I get is usually about 340 ms, which looks wrong : when I route an incoming signal from [adc~] to [dac~] (a kind of audio bypass patch), I don't hear any latency between the direct source and the output. Therefore the latency of my computer should be at least lesser than 10 ms ; my sound card is set to 128 samples (3 ms)
What soundcard on what OS on what CPU is this?
regards! Peter_P
Selon plessas@sbox.tugraz.at:
What soundcard on what OS on what CPU is this?
the sound card is an RME Hammerfall Multiface the computer is a PC with a Pentium 4 2.4 GHz CPU, with a RAM of 512 Mo the OS is Windows XP professional
for Pure Data, Nuendo and Max/MSP, I have set the latency of the sound card to 128 samples (3 ms), but 64 samples (1.5 ms) usually works
but I don't know what is the effective latency (from analogue input to analogue output) I get using Pure Data, as the result given by "latency.pd" looks false (usually 300-400 ms)
Hallo, julien.breval@tremplin-utc.net hat gesagt: // julien.breval@tremplin-utc.net wrote:
Selon plessas@sbox.tugraz.at:
What soundcard on what OS on what CPU is this?
the sound card is an RME Hammerfall Multiface the computer is a PC with a Pentium 4 2.4 GHz CPU, with a RAM of 512 Mo the OS is Windows XP professional
for Pure Data, Nuendo and Max/MSP, I have set the latency of the sound card to 128 samples (3 ms), but 64 samples (1.5 ms) usually works
latency.pd measures round-trip latencies, your figures here seem to only use a one-way ticket.
but I don't know what is the effective latency (from analogue input to analogue output) I get using Pure Data, as the result given by "latency.pd" looks false (usually 300-400 ms)
That's too worse. Pd should be better than that.
ciao
Frank Barknecht _ ______footils.org__
Quoting mattn-l@rogers.com:
is this because of portaudio on os x?
yes.
or is there something i can do about it?
start here: http://developer.apple.com/audio/macosxaudio.html
i have too much on my plate right now to rip all the portaudio out of pd and replace it with straight CoreAudio calls. but that's what someone needs to do...
i know that the motu will do 3-4ms with max/msp and reaktor, but not with pd.
there's not a single reason pd can't do the same - all it requires is a little work. pd desperately needs a few more OSX devs that know their shit. we've got the video down cold, and jamie is hard at work making tcl/tk less ass-tastic, but some of the basic pd functionality still needs work. nothing a little OSX native code/APIs couldn't fix.
cgc
matt.
-
cgc＠humboldtblvd.com -
Frank Barknecht -
julien.breval＠tremplin-utc.net -
mattn-l＠rogers.com -
plessas＠sbox.tugraz.at