Re: Cannot start jack from KDE

Actually, scratch that. I initialised everything from one
account and Jack 
got working BUT now AmaroK's Xine sound engine will not
initialise anymore

Any help?

>From: Paul Davis <paullinuxaudiosystems.com>
>Reply-To: paullinuxaudiosystems.com
>To: Chris Delahousse <dahouse7hotmail.com>
>CC: jackit-devellists.sourceforge.net
>Subject: Re: [Jackit-devel] Cannot start jack from KDE
>Date: Tue, 17 Apr 2007 20:54:11 -0400
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>On Tue, 2007-04-17 at 20:50 -0400, Chris Delahousse
wrote:
> > Hey guys,
> >
> > I just installed jack and when I launch it from
super user status in a
> > terminal, it'll load, but when I installed
qjackctl and added it to 
>KDE's
> > start menu, it won't connect to Jack. I need to
start jack manually by
> > opening up Konsole, going into SU mode and running
it. It then freezes 
>the
> > terminal window (ie. I can no longer enter
commands).
> >
> > So, is there a way so that I can launch the server
with qjackctl from 
>KDE
> > without needed to get super user privileges. I
added my user to the 
>audio
> > group.
>
>with released versions of JACK, the user who starts
jackd and the user
>who starts JACK applications must be the same. if you
are using root to
>start it so that you can use SCHED_FIFO (-R), please fix
your system to
>allow non-root users to do that. google will reveal all
(even though the
>jackaudio.org website should).
>
>earlier today, i committed some changes to svn that
allow a more
>"promiscuous" model.
>
>--p
>
>

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On Tue, 2007-04-17 at 21:31 -0400, Chris Delahousse wrote:
> Actually, scratch that. I initialised everything from
one account and Jack 
> got working BUT now AmaroK's Xine sound engine will not
initialise anymore

that is correct. JACK takes exclusive control of the audio
h/w. Desktop
linux audio sucks (TM)

--p



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On Wed, April 18, 2007 03:26, Paul Davis wrote:
> On Tue, 2007-04-17 at 21:31 -0400, Chris Delahousse
wrote:
>
>> Actually, scratch that. I initialised everything
from one account and
>> Jack got working BUT now AmaroK's Xine sound engine
will not initialise
>> anymore
>
> that is correct. JACK takes exclusive control of the
audio h/w. Desktop
> linux audio sucks (TM)
>

Sucks a bit less nowadays 

Xine has a jack backend driver for some time now. You can
configure it
either from xine setup or/and from amarok. See amarok's
Settings/Configure
Amarok/Engine, on Sound System="xine Engine" set
Output plugin = "jack".

Ah, there's a catch: now amarok/xine will get muted when
jackd is not
running :P You'll have to decide whether you really want to
run jackd all
the time or not. Another issue, in case you decide going
jackified all the
way: flash9 audio won't work, e.g. youtube videos will have
no sound
unless you setup your jackd alsa backend for dmix or
something (.asoundrc
magic). But OK, that's another Desktop-linux-audio-sucks(TM)
story 

Regarding artsd, I do disable it permanently from KDE
Control Panel,
setting Sound and Multimedia/Sound System/Enable the sound
system off.

Then, on QjackCtl I have this example on Setup/Options:

  [x] Execute script on Startup:

      artsshell -q terminate

  [x] Execute script after Startup:

      artsd -F 4 -S 4096 -q jack -m artsmessage -c drkonqi
-l 3 -f &

  [x] Execute script on Shutdown:

      artsshell -q terminate

  [x] Execute script after Shutdown:

      killall artsd jackd

So that you let artsd (late KDE's sound system) also coexist


Of course this one time setup suggestion works best if you
set QjackCtl as
a shortcut entry under ~/.kde/Autostart, so let it run on
every KDE login
startup, and also remember to give it all the way clear on
Setup/Misc/,
like for instance:

   [x] Start JACK audio server on application startup

Hope it would suck a bit less now ;)

Cheers.
-- 
rncbc aka Rui Nuno Capela
rncbcrncbc.org

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