Recent changes to support-requests

Midas M32 glitches even with high frame values

juan ramon castan — Tue, 01 Dec 2020 13:13:27 -0000

When I start jackd using Midas M32 with low frames (i.e. 32) value it glitches. I know it is normal but when I try higher values it works fine but after a while (5, 10, ? minutes) glitches begin and them go to more and more until it sounds as a smaller frames value.
It doesn't happen with other interfaces like RME UFXII or Focusrite PRO40.
Neither when I use ALSA directly.
Someone can brings some light to this dark behavior

loosing sample frames

Anonymous — Wed, 31 Jan 2007 07:12:42 -0000

Cuando trato de grabar via MIDI con Rosegarden, sale este mensaje: "subsistema de audio jack está perdiendo muestras". ¿Qué significa? ¿Qué implica?.
Utilizo Ubuntu Dapper y tarjeta de sonido USB Audiophile). Gracias por vuestro trabajo.

multiple sound cards

bob dagit — Fri, 16 Jun 2006 03:02:11 -0000

my linux music dstros recognize both my es1371 sound
cards, and i can output to midi through both cards at
the same time. but only seem to output to one pcm out
port. i can reset jackd through qjackctl to use either
sound card hw:0 or hw:1 and that does change the pcm
out audio device.
it is clear now that both cards work in alsa at the
same time, and their midi parts work in jackd all right.
why can't i have both pcm out devices or how to i
configure jackd to do that?
i even started two instances of jackd (not in real
time), one configured for each card, but again only one
pcm out device is working, the first instance started.

can't compile with realtime capabilities

bikkobold — Sun, 28 Aug 2005 10:55:18 -0000

hi i use jack since a year and i'm very happy about it.
thanks for all your work. I tried to use a patched
kernel to improve latency but i could'nt compile jack

my config
i586 mandrake 10.2 kernel 2.6.1.7 patched
realtime-preemption
Alsa 1.0.8

i tried to compile jack 0.100 with realtime
capabilities but got this error while 'configure'

checking for capgetp in -lcap... no
configure: WARNING: *** no libcap present
configure: WARNING: *** required program md5sum not found
configure: error: *** Capabilities support not present.
Run configure again without --enable-capabilities.

compiling without realtime works fine

i have libcap 1.10 and md5sum installed

any idea to solve this problem?

jackd can't see alsa

Anonymous — Sun, 08 May 2005 08:49:46 -0000

I have jack and alsa installed but when I run:
jackd -d alsa

...I get an error:
jackd: unknown driver 'alsa'

I do have alsa installed: kinfocenter shows 'Type 10
ALSA emulation' as my driver.

Should I be doing something to point jack at alsa?

Thanks in advance

Damon can't start (PCM assertion failed)

Anonymous — Tue, 24 Aug 2004 20:38:12 -0000

It throws me the following errors:

16:31:34.901 /usr/bin/jackd -v -dalsa -dhw:1 -r48000 -p1024
-n2 -P
16:31:34.951 JACK was started with PID=3000 (0xbb8).
getting driver descriptor from /usr/lib/jack/jack_alsa.so
getting driver descriptor from /usr/lib/jack/jack_dummy.so
jackd 0.94.0
Copyright 2001-2003 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
registered builtin port type 32 bit float mono audio
loading driver ..
new client: alsa_pcm, id = 1 type 1 @ 0x8058a00 fd = -1
apparent rate = 48000
creating alsa driver ... hw:1|-|1024|2|48000|0|0|nomon|
swmeter|rt|32bit
jackd: pcm.c:690: snd_pcm_nonblock: Assertion `pcm' failed.

I know it's related to the pcm, but don't know what to do...

won't configure on IRIX 6.5(missing getopt_long)

Anonymous — Sun, 11 Jul 2004 20:57:58 -0000

...
checking for getopt_long... no
configure: error *** JACK requires GNU getopt_long
-----------------------------------------------------------

this is not a part of IRIX OS, nor of a compatible freeware, which
seems to mean JACK can't work with IRIX, unlike announced.

SYSTEM: 6.5.14
COMPILER:mipsPRO-7.3.1.2

if anyone has experience how to get around, please, let me know:

stanko.juzbasic@zg.htnet.hr

jack client make questions on Linux

Mark J. Hufe — Thu, 10 Jun 2004 16:02:34 -0000

I'm running Mandrake 10, with kernal 2.6. I installed
jack-audio-connection-kit-0.98.1 and it seems to work
with the examples provided. However, I'm at a loss when
it comes to compiling, linking, and running a file
outside of the make file provided in the examples. That is,
make jack_simple_client

produces an executable that works fine.

However, I really don't understand much of what the
make file is doing. What is the .libs directory for,
which seems to get a copy of the executable?

When I my own version of simple_client and compile it:

gcc -g -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS -Wall
-L/usr/local/lib -lpthread -ldl -lm -ljack -o
simple_client simple_client.c

it compiles and links okay. But when I run it I get the
following message, even though libjack.so.0 is in
/usr/local/lib

[hufe@localhost pelaudio]$ ./simple_client mark
./simple_client: error while loading shared libraries:
libjack.so.0: cannot open shared object file: No such
file or directory
[hufe@localhost pelaudio]$

What is the purpose of the .libs directory? Also, what
would make the library invisible at run time, even
though it is there?

I can't run jackd as user

Tommy — Sun, 16 May 2004 16:10:32 -0000

I use Debian Sid and Kernel 2.6.6

I can use as root jackd, but as user not.

I've installed the module "realtime lsm" but have the
same probelm.

Jackd don't work as user also without the "-R" param.

"ALSA: cannot set number of periods to 2 for capture"

jago pearce — Sat, 24 Jan 2004 14:47:52 -0000

Soundcard is yamaha ymfpci. Using Alsa9 and Gentoo.
Can post more details if required.

betty.net[~] $ jackd -d alsa
jackd 0.71.1
Copyright 2001-2003 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
loading driver ..
creating alsa driver ...
default|1024|2|48000|swmon|swmeter|rt
open
You appear to be using the ALSA software "plug" layer,
probably
a result of using the "default" ALSA device. This is less
efficient than it could be. Consider using a
~/.asoundrc file
to define a hardware audio device rather than using the
plug layer

ALSA: cannot set number of periods to 2 for capture
ALSA: cannot configure capture channel
starting engine
engine driver not set; cannot start
cannot start main JACK thread
jack main caught signal 15
received signal 11 during shutdown (ignored)
betty.net[~] $