Hello all,
The thread on 'crackles in audio' reminded me of a similar problem
which upset me for some years now.
I normally run Jack all the time, and for apps that don't support it
there's an ~/.asoundrc like this:
pcm.!default {
type plug
slave { pcm "jack" }
}
pcm.jack {
type jack
playback_ports {
0 zita-mu1:in_2.L
1 zita-mu1:in_2.R
}
capture_ports {
0 system:capture_1
1 system:capture_2
}
}
If you don't know what zita-mu1 is, see here:
<http://kokkinizita.linuxaudio.org/linuxaudio/zita-mu1-doc/quickguide.html>
The only use case for this is viewing youtube videos with either
Chromium or Firefox, which will use ALSA's default device.
This works ok but after some time I get 'crackles'. It sounds
like a buffer wraparound. Repositioning or stopping/restarting
the video usually solves the problem, but it will come back
after some time.
I see no reason why things shouldn't 'just work'. And I've been
wondering: is this a long-standing problem with ALSA's Jack
plugin, or are the browsers doing something wrong ? In either
case, is there a solution (not involving PA or loop devices) ?
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)
If one would like tu use Linux as an audio workstation with say, Ardour
to do the recording, all housed inside a midsize tower i5 or so
computer, what would be the recommended audio interface ? The one that
integrates to Linux 99% and works really well while providing a
certain number of I/Os ?
There must be one that satisfies serious home (or small studio) uses. I
do not believe that all Linux audio users are clinging to their legacy,
no-longer-sold M-Audio 1010 interfaces :)
Cheers.
Yet a other one off the mini series from GUI-less LV2 plugs,
This time, a analogue simulation of the Vintage Fuzz Master (Devi Ever)
This one comes with a bass/bright switch and is a bit modified to
produce less Volume then the original pedal.
With "Intensity" down, it will blow up the low end, but by turn it up,
it produce the well known and loved octave up artefacts.
https://github.com/brummer10/GxVintageFuzzMaster.lv2
>All we wanna do is have some fuzz
This piece is built around an acoustic guitar improvisation laid over
a drum riff. Various sounds swishes around amongst phaser cymbals
while a lead ethnic synth of future tribal times tells a story of not
so quiet times floating over a loose and dirty bass.
Enjoy.
https://soundcloud.com/nominal6/jam35
Hello,
Suddenly the audio started crackling. I was listening to a youtube
tutorial (firefox) and it started. Bitwig and Renoise were running but
not playing anything. I looked at the log files (syslog, kern) nothing
relevant. Card is 10101LT.
jackd runs at about 10.3ms latency (last time I checked using
jack_iodelay), so it run as:
/usr/bin/jackd --sync -T -P95 -ndefault -dalsa -dhw:M1010LT -r44100
-p128 -n2
scaling_gouvernor all set to performance. Interrupt prio looks OK:
PID CLS RTPRIO NI PRI %CPU STAT COMMAND
436 FF 90 - 130 1.6 S irq/18-snd_ice1
47 FF 50 - 90 0.0 S irq/9-acpi
limits audio.conf is:
@audio - rtprio 95
@audio - memlock unlimited
Interrupts servicing for all 4 CPUs (i5) :
0: IR-IO-APIC-edge i8042
4: IR-IO-APIC-edge
8: IR-IO-APIC-edge rtc0
9: IR-IO-APIC-fasteoi acpi
12: IR-IO-APIC-edge i8042
18: IR-IO-APIC-fasteoi snd_ice1712
jackd and pulse processes:
/usr/bin/pulseaudio --start --log-target=syslog
[pulseaudio] <defunct>
/usr/bin/jackd -T -ndefault --sync -T -P95 -ndefault -dalsa
-dhw:M1010LT -r44100 -p128 -n2
The pa zombie was there way before the crackling started. Not sure if
this is related.
The pulseaudio jackd sink is active and can be seen in qjackctl.
So it seems OK. But the audio is full of crackles. In firefox, as
well as Bitwig and Renoise when now something is played. Of course,
when the machine was started some audio was played in both Bitwig and
Renoise and it was fine. Then I watched a youtube tutorial and bam,
after maybe 15 minutes, all audio output is full of crackling.
Since the log files shows nothing. How is troubleshooting information
gathered ? There should be some SW system component that can be
probed, somwthing that could be observed. - or is it that the 1010LT
is going awry ? Can this happen at all ?
Thanks for suggestions and comments !
Cheers.
Hi all,
What's there on the market nowadays that works very well in Linux ?
I use many in/out lines on the 1010LT. I use 5 line outs, 4 line
ins, 2 XLR ins. I find it practical not having to re-connect things.
Nice for recording. And also, not needing extra hardware to connect
many lines to an interface limited in I/O is good.
The replacement audio card should have a good number of I/o lines, as
well as XLR inputs.
Just got recently an ART MPA II pre-amp which I'm slowly exploring. So
phantom power from an audio interface is not a criteria.
Browsing the M-Audio site, the M-Track Eight rack mount USB unit might
be something along those lines, although since I also have things
connected to the 3 USB ports, I would tend to prefer one that does not
use USB. Also, it sounds like it comes with controlling software that
could be not available on Linux, or available with limited
capabilities. Some for the Octane Preamp Technology M-Audio is
boasting about that interface: not needed. I'd prefer putting money
into the interface itself.
The other offerings from M-Audio are those rather limited-looking
interfaces with a big knob sitting on top.
I do not know of any other serious audio interfaces out there -
suggestions and comments are welcomed !
Cheers.
I want to collaborate with someone in non-realtime. I see that there is a
project called ardour session exchange. I read on the ardour forum that it
has been included into ardour code now. I don't see where this is
documented though. Does anyone know how to use it? Is this the best choice
to collaborate with people on a recording project in a non-realtime way?
Thanks,
Jeremiah
>
> "jonetsu(a)teksavvy.com":
> Hello,
>
> Suddenly the audio started crackling. I was listening to a youtube
> tutorial (firefox) and it started. Bitwig and Renoise were running but
> not playing anything. I looked at the log files (syslog, kern) nothing
> relevant. Card is 10101LT.
>
>
Are you running demo versions of the u-he plugins in bitwig or renoise?
Hey hey everyone,
I've looked more into this problem and found that JACK will start by using
between one and two percent of the CPU, but will gradually require more. After
a day JACK's CPU usage stands at about 65-85%.
Usage: currently only mpv (multimedia player, completely shut down after every
use). No persisting audio connections, no other realtime and CPU hungry
applications.
JACK Version: 0.121.3
Kernel Version: 3.9.0-rc6 SMP PREEMPT
CPU scheduling/scaling_governor: powersave
CPU setting: 800MHz single-core (of a 3GHz quadcore)
Underlying soundcard device: ALSA multi with two MAudio Delta 1010 LT cards,
sync'ed via S/PDIF.
JACK commandline:
jackd --timeout 4500 -R -d alsa -C cdelta -P pdelta -r 48000 -p 256 -z shaped
short-time load average: 0.47 (decreasing for longer periods).
If more information or experimentation, to identify the issue, is necessary,
please let me know.
Thank you for any help and hints in the right direction.
Ta-ta,
----
Ffanci
* Homepage: https://freeshell.de/~silvain
* Twitter: http://twitter.com/ffanci_silvain
* GitHub: https://github.com/fsilvain
