4 Sep
2019
4 Sep
'19
11:46 a.m.
Thanks for the answers! Helps me a lot! I'm glad JACK can do this number
of channels with low latency :-)
But this remarks about 'if you have bad luck' scares me a little bit.
And I hope that setting up a real time kernel is not needed. Isn't audio
in general driven (timed) by the final target device? E.g. the audio
output of the computer?
Maybe I should explain a little what we want to do:
We want to use SuperCollider to generate hunderds of sounds. Then this
should be streamed to our game engine using JACK where there will be som
processing and mixing. The final result is 2 channel audio that should
be routed to some audio output (USB Dac for instance).
Do I need to set up my own real time kernel for this?
Suppose we use JACK for the connection to SuperCollider and to the final
audio output. Will that be easy? Is the audio timing in this case
controlled by the audio output? If not, then there need to be some audio
resampling. That will cause latency and probably distortion. So I want
to prevent that.
B.T.W., we are running on Windows 10.
Op 4-9-2019 om 18:06 schreef Ralf Mardorf:
On Wed, 4 Sep 2019 17:09:49 +0200, Robin Gareus
wrote:
The hard part is usually setting up JACK and
tweaking a system for low
latency.
Hi,
IMO setting up jack is no issue at all (assuming there are no other
sound servers installed, that could cause trouble), but I agree that
tweaking the system for lowlatency could be hard, but not necessarily
is hard to do. In my bad and good experiences it depends on luck related
to the mobo and audio device.
If you should have good luck, all you need is a vanilla kernel booted
with 'threadirqs' or a real-time patched
kernel, https://mirrors.edge.kernel.org/pub/linux/kernel/projects/rt/
and what ever kernel you run, the rtirq script,
https://github.com/rncbc/rtirq .
If you should have bad luck with the hardware, you could try a lot of
other things that might or might not improve audio latency and/or MIDI
jitter. For me migrating from AMD based hardware, to Intel based
hardware and avoiding the usage of a professional, but bad supported RME
PCIe card by an USB class compliant prosumer device was the most
successful step.
"hundreds of audio channels", at least when using Ardour, are no big
deal, even not with an energy-efficient CPU, with less horsepower.
However, I wonder what you consider to be "lowlatency" and what else
apart from the amount of audio channels might have impact on the load.
Some people expect latency way lower, than any usual digital stomp
box or 19" effect provides.
YMMV!
Ralf