Re: [LAU] [LAD] Document on using Jack Apps

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To: James Morris <james@...>
Cc: <linux-audio-user@...>
Date: Monday, August 2, 2010 - 2:53 am

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On Sun, Aug 1, 2010 at 3:08 PM, James Morris wrote:

> On 1 August 2010 19:37, Arvind Venkatasubramanian

*James:*

These are the responses I get from the program upon pinging the commands. I
am trying to set a time out: 500 ms and I do not get a successful return
flag. I also get some info about sys config which probably comes from
SElinux which I have forced it to permissive mode. What would you comment
on this?

[Arvind@laspr-01 ~]$ jackd -r -t 500
jackd 0.118.0
Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn 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

jackd 0.118.0
Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn 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

usage: jackd [ --no-realtime OR -r ]
[ --realtime OR -R [ --realtime-priority OR -P priority ] ]
(the two previous arguments are mutually exclusive. The default is
--realtime)
[ --name OR -n server-name ]
[ --no-mlock OR -m ]
[ --unlock OR -u ]
[ --timeout OR -t client-timeout-in-msecs ]
[ --port-max OR -p maximum-number-of-ports]
[ --debug-timer OR -D ]
[ --no-sanity-checks OR -N ]
[ --verbose OR -v ]
[ --clocksource OR -c [ c(ycle) | h(pet) | s(ystem) ]
[ --replace-registry ]
[ --silent OR -s ]
[ --version OR -V ]
[ --nozombies OR -Z ]
-d backend [ ... backend args ... ]
Available backends may include: alsa, dummy, freebob, firewire,
net, oss, sun, or portaudio.

jackd -d backend --help
to display options for each backend

[Arvind@laspr-01 ~]$ jackd -t 500
jackd 0.118.0
Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn 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 is running in realtime mode, but you are not allowed to use realtime
scheduling.

After applying these changes, please re-login in order for them to take
effect.

*You don't appear to have a sane system configuration.* It is very likely
that you
encounter xruns. Please apply all the above mentioned changes and start jack
again!
[Arvind@laspr-01 ~]$

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On Sun, Aug 1, 2010 at 3:08 PM, James Mo=
rris <james@jwm-a=
rt.net
> wrote:
On 1 August 2010 19:37, Arvind Venkatasubramanian <mdu.arvind@gmail.com> wrote:

> Question on using QJACKctl:

ts
tab of
and the
to set
lop?
e lower
=A0Or Do I
ually.
=A0I confirmed
sking

Typing in the console:

man jackd

will help you identify the nature of some of the command line options
for jack, as well as give you some clues for matching them to the tabs
within QjackCTL.

I'm no expert, and all I've ever tried for getting the best (lowest=
)
latency is by experimenting with seeing how low I can go with the
Frames/Period setting in QjackCTL which is the -p or --period setting
on the command line. If it works and no x-runs occur, then...
...it works :-)

A method of identifying which command line option to Jack relates to
which setting in QjackCTL is by changing a setting in qjackctl and
stop/starting Jack through qjackCTL while watching the messages log.

James.
_______________________________________________James:These are th=
e=A0responses=A0I get from the program upon pinging the commands. =A0I am t=
rying to set a time out: 500 ms and I do not get a=A0successful=A0return fl=
ag. =A0I also get some info about sys config which probably comes from SEli=
nux which I have forced it to permissive mode. =A0What would you comment on=
this?
[Arvind@laspr-01 ~]$ jackd -r -t 500jackd 0.=
118.0Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Q=
uinn, Torben Hohn and others.jackd comes with ABSOLUTELY NO WARR=
ANTY
This is free software, and you are welcome to redistribute itunder certain conditions; see the file COPYING for details=
jackd 0.118.0Copyright 2001-2009 Paul Davis, Stephane=
Letz, Jack O'Quinn, Torben Hohn and others.
jackd comes with ABSOLUTELY NO WARRANTYThis is free softwar=
e, and you are welcome to redistribute itunder certain condition=
s; see the file COPYING for details
usage: jackd [ --no-realtime OR -r ]=A0=A0 =A0 =A0 =A0 =A0 =
=A0 [ --realtime OR -R [ --realtime-priority OR -P priority ] ]=
=A0=A0 =A0 =A0(the two previous arguments are mutually exclusive. The defau=
lt is --realtime)
=A0=A0 =A0 =A0 =A0 =A0 =A0 [ --name OR -n server-name ]=A0=
=A0 =A0 =A0 =A0 =A0 =A0 [ --no-mlock OR -m ]=A0=A0 =A0 =A0 =A0 =
=A0 =A0 [ --unlock OR -u ]=A0=A0 =A0 =A0 =A0 =A0 =A0 [ --timeout=
OR -t client-timeout-in-msecs ]=A0=A0 =A0 =A0 =A0 =A0 =A0 [ --p=
ort-max OR -p maximum-number-of-ports]
=A0=A0 =A0 =A0 =A0 =A0 =A0 [ --debug-timer OR -D ]=A0=A0 =
=A0 =A0 =A0 =A0 =A0 [ --no-sanity-checks OR -N ]=A0=A0 =A0 =A0 =
=A0 =A0 =A0 [ --verbose OR -v ]=A0=A0 =A0 =A0 =A0 =A0 =A0 [ --cl=
ocksource OR -c [ c(ycle) | h(pet) | s(ystem) ]
=A0=A0 =A0 =A0 =A0 =A0 =A0 [ --replace-registry ]=A0=A0 =A0 =A0 =
=A0 =A0 =A0 [ --silent OR -s ]=A0=A0 =A0 =A0 =A0 =A0 =A0 [ --ver=
sion OR -V ]=A0=A0 =A0 =A0 =A0 =A0 =A0 [ --nozombies OR -Z ]=A0=A0 =A0 =A0 =A0 -d backend [ ... backend args ... ]
=A0=A0 =A0 =A0 =A0 =A0 =A0 Available backends may include: alsa, dummy=
, freebob, firewire, net, oss, sun, or portaudio.=
=A0=A0 =A0 =A0 jackd -d backend --help=A0=A0 =A0 =A0 =A0 =A0 =A0=
to display options for each backend
[Arvind@laspr-01 ~]$ jackd -t 500jackd 0.118=
.0Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quin=
n, Torben Hohn and others.jackd comes with ABSOLUTELY NO WARRANT=
Y
This is free software, and you are welcome to redistribute itunder certain conditions; see the file COPYING for details=
JACK is running in realtime mode, but you are not=
allowed to use realtime scheduling.
After applying these changes, please re-login in order =
for them to take effect.You don't appear to have a sane system con=
figuration. It is very likely that you
encounter xruns. Please apply all the above mentioned changes and star=
t jack again![Arvind@laspr-01 ~]$=A0=A0

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Messages in current thread:
Re: [LAU] [LAD] Document on using Jack Apps, Arvind Venkatasubramanian..., (Sun Aug 1, 6:37 pm)
Re: [LAU] [LAD] Document on using Jack Apps, Jean-Yves Poilleux, (Tue Aug 3, 11:02 am)
Re: [LAU] [LAD] Document on using Jack Apps, Paul Davis, (Tue Aug 3, 1:54 pm)
Re: [LAU] [LAD] Document on using Jack Apps, Jean-Yves Poilleux, (Tue Aug 3, 2:23 pm)
Re: [LAU] [LAD] Document on using Jack Apps, James Morris, (Sun Aug 1, 7:08 pm)
Re: [LAU] [LAD] Document on using Jack Apps, Arvind Venkatasubramanian..., (Mon Aug 2, 4:48 am)
Re: [LAU] [LAD] Document on using Jack Apps, Arvind Venkatasubramanian..., (Mon Aug 2, 2:53 am)