JACK audio server problem

randhir phagura rsphagura at hotmail.com
Sat Mar 8 22:53:19 PST 2008


Hi all,

This may not be exactly part of BLFS but still is related. Just trying my luck in case someone on our lists have been playing with JACK. I have tried google as well as man but have not found a remedy.

I want to use JACK with ardour-2.3.1. But it gives the following messages:

1. The output of the following command is given below:

rsp at laptop:~> jackd -v -R -d alsa -d hw:0 -r 44100 -p 1024 -n 2
getting driver descriptor from /usr/lib/jack/jack_oss.so
getting driver descriptor from /usr/lib/jack/jack_dummy.so
getting driver descriptor from /usr/lib/jack/jack_alsa.so
getting driver descriptor from /usr/lib/jack/jack_freebob.so
jackd 0.109.2
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 POSIX SHM support.
server `default' registered
cannot use real-time scheduling (FIFO at priority 10) [for thread -1210767680, from thread -1210767680] (1: Operation not permitted)
cannot create engine
cleaning up shared memory
cleaning up files
unregistering server `default'

2. The output without realtime option (-R) gives the following output:

rsp at laptop:~> jackd -v -d alsa -d hw:0 -r 44100 -p 1024 -n
getting driver descriptor from /usr/lib/jack/jack_oss.so
getting driver descriptor from /usr/lib/jack/jack_dummy.so
getting driver descriptor from /usr/lib/jack/jack_alsa.so
getting driver descriptor from /usr/lib/jack/jack_freebob.so
jackd 0.109.2
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 POSIX SHM support.
server `default' registered
registered builtin port type 32 bit float mono audio
registered builtin port type 8 bit raw midi
clock source = system clock via clock_gettime
loading driver ..
apparent rate = 44100
creating alsa driver ... hw:0|hw:0|1024|2|44100|0|0|nomon|swmeter|-|32bit
new client: alsa_pcm, id = 1 type 1 @ 0x805be18 fd = -1
control device hw:0
configuring for 44100Hz, period = 1024 frames (23.2 ms), buffer = 2 periods
ALSA: final selected sample format for capture: 32bit little-endian
ALSA: use 2 periods for capture
ALSA: final selected sample format for playback: 32bit little-endian
ALSA: use 2 periods for playback
new buffer size 1024
Segmentation fault

3. Trying to start JACK with QJackCtl - which is an application for starting the server- get the following error:

cannot load driver module alsa
no message buffer overruns
10:00:58.001 JACK was started with PID=15338.
10:00:58.002 JACK was stopped successfully.
10:00:58.003 Post-shutdown script...
10:00:58.003 killall jackd
jackd: no process killed
10:00:58.410 Post-shutdown script terminated with exit status=256.
10:01:00.114 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info.
JACK tmpdir identified as [/dev/shm]

4. On starting from ardour I get the following error:

Ardour could not start JACK
There are several possible reasons:

    1)You requested audio parameters that are not supported..
    2)JACK is running as another user.
  Please consider the possibilities and perhaps try different parameters.

Can anyone suggest a solution please?

Thanks & Regards

Randhir Phagura
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