LinuxMusicians

Hello,

I am trying to get JACK started, but it is not going anywhere. I installed it, then it did not work. I tryd all of the changes provided in the link but they did not help eather. When i try to launch JACK i get this:

18:06:11.793 Patchbay deactivated.
18:06:11.924 Statistics reset.
18:06:12.003 Startup script...
18:06:12.004 artsshell -q terminate
18:06:12.160 MIDI connection graph change.
JACK tmpdir identified as [/dev/shm]
JACK tmpdir identified as [/dev/shm]
can't create mcop directory
Creating link /home/koen/.kde/socket-koen-laptop.
18:06:12.505 Startup script terminated with exit status=256.
18:06:12.505 JACK is starting...
18:06:12.505 jackstart -R -dalsa -dhw:0 -r44100 -p64 -n2 -m
18:06:12.509 Could not start JACK. Sorry.
18:06:14.039 JACK was stopped successfully.
18:06:14.041 Post-shutdown script...
18:06:14.043 killall jackd
jackd: er is geen proces afgebroken
18:06:14.274 Post-shutdown script terminated with exit status=256.
18:06:14.481 MIDI connection change.
18:06:28.443 Startup script...
18:06:28.444 artsshell -q terminate
JACK tmpdir identified as [/dev/shm]
can't create mcop directory
Creating link /home/koen/.kde/socket-koen-laptop.
18:06:28.729 Startup script terminated with exit status=256.
18:06:28.729 JACK is starting...
18:06:28.730 /usr/bin/jackd -R -dalsa -dhw:0 -r44100 -p64 -n2 -m
18:06:28.735 JACK was started with PID=21816 (0x5538).
jackd 0.103.0
Copyright 2001-2005 Paul Davis and others.
jackd comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK compiled with System V SHM support.
cannot use real-time scheduling (FIFO at priority 10) [for thread -1210324288, from thread -1210324288] (1: Operation not permitted)
cannot create engine
18:06:28.749 JACK was stopped successfully.
18:06:28.749 Post-shutdown script...
18:06:28.749 killall jackd
jackd: er is geen proces afgebroken
18:06:28.963 Post-shutdown script terminated with exit status=256.
18:06:30.777 Could not connect to JACK server as client. Please check the messages window for more info.
JACK tmpdir identified as [/dev/shm]


This means nothing to me, i have no clue of what it is about but can someone help me?

Koen.

Hi Koen,

To answer your question. I'm not a jack expert. Maybe you can try set off realtime? Maybe you should set a higher value at Frames/Period....
Maybe try to set on 'softmode'... did you pick the right soundcard (I've hw 0;0) ??

sadly none of your solutions seem to work. Where is jack for anyway? What does it do? Well i think ill launch windows again and try my luck on fruityloops or something else.

koenvanwijk wrote:sadly none of your solutions seem to work. Where is jack for anyway? What does it do? Well i think ill launch windows again and try my luck on fruityloops or something else.

from http://jackaudio.org/
What is JACK?

Have you ever wanted to take the audio output of one piece of software and send it to another? How about taking the output of that same program and send it to two others, then record the result in the first program? If so, JACK may be what you've been looking for.
JACK is a low-latency audio server, written for POSIX conformant operating systems such as GNU/Linux and Apple's OS X. It can connect a number of different applications to an audio device, as well as allowing them to share audio between themselves. Its clients can run in their own processes (ie. as normal applications), or can they can run within the JACK server (ie. as a "plugin").
JACK was designed from the ground up for professional audio work, and its design focuses on two key areas: synchronous execution of all clients, and low latency operation. More background information is available.

More information about the jack setup is here: http://www.64studio.com/manual/audio/jack

Here s another setup: http://img525.imageshack.us/img525/4308 ... tupqy7.png

I always have a RT kernel, but someone says it is not needed perse.. but I think it will give you better results.

Maybe you have to edit your /etc/security/limits.conf
more info about that you can find here: http://tapas.affenbande.org/wordpress/?page_id=73


You can try to install the ubuntu studio audio packages which installs the RT kernel and a lot(!?!) other (useful) packages.... You can also try it at #ubuntustudio @ freenode, IRC chat....

studio32 wrote: cannot use real-time scheduling (FIFO at priority 10) [for thread -1210324288, from thread -1210324288] (1: Operation not permitted)
cannot create engine

I think this is the core of your problem - google turns up quite some results for this, for example this one looks promising.

@ Koen, so it seems you have to edit your /etc/security/limits.conf

I had a very simple solution for my jack not running, not on Linux right now, but look into your settings. Something like HW1 -> look if your soundcard is recognized of that you selected the right one. Also, look in the howto, I posted a link on how to configure your settings for jack.