24 Jan
2005
24 Jan
'05
4:56 a.m.
Antonio "Willy" Malara wrote:
First thing you're missing is probably the realtime-lsm module. Without it
you can't run "jackd -R ..." as a regular user (only as root?).
Cheers.
--
rncbc aka Rui Nuno Capela
rncbc(a)rncbc.org
Both modes are perfectly legal but, with this
later one, you can run on
much lower latency settings (e.g. -p64 -n2) without crackling your ears
:)
[snip] Zeryn:/home/willy/Pacchi/jack-0.99.48-cvs20040122#
jackd -dalsa -dhw:0,2
-r44100 -p64 -n2 -S
jackd 0.99.48
[...]
loading driver ..
apparent rate = 44100
creating alsa driver ...
hw:0,2|hw:0,2|64|2|44100|0|0|nomon|swmeter|-|16bit
control device hw:0
ALSA/USX2Y: EXPERIMENTAL hwdep pcm device hw:0,2 (aka "rawusb")
configuring for 44100Hz, period = 64 frames, buffer = 2 periods
Couldn't open hw:0,2 for 16bit samples trying 24bit instead
Couldn't open hw:0,2 for 24bit samples trying 32bit instead
Sorry. The audio interface "hw:0,2" doesn't support any of the hardware
sample formats that JACK's alsa-driver can use.
ALSA: cannot configure capture channel
i've tried with plug layer (-d plughw:0,2) and it worked, i get some
xruns, but the audio is a loud continous noise.
What hardware is this?
Anyway, try some deffensive approaches:
1) jackd -R -d alsa -d hw:0 -r44100 -p1024 -n2 -S
2) jackd -R -d alsa -d plughw:0 -r44100 -p1024 -n2 -S
3) repeat without nrpacks=1 parameter
Be advised
however, that you get far better results if you're running
jackd in realtime mode (-R) *and* under the help of a RT capable kernel,
like 2.6.10-mm1 with Ingo's V0.7.34-01 realtime-preempt patch.
unfortunately i cant compile realtime preempt patches, i've tried almost
any version but they seems to be linux/x86 only. i keep searching some
kind of lowlatency patches that i can apply succesfully