JackAudio September 2018

jackaudio@lists.linuxaudio.org

10 participants
7 discussions

by Stefan Hellkvist

Hi list, (Sorry this question has already been discussed but the search function in the archive of the list does not work) Is anyone working on the problem of getting Jack up and running on MacOS again? I installed Jack with brew but I get these “could not handle external client request” errors which seems to be old problems from looking at search results and GitHub discussions - problems introduced when MacOS audio architecture was changed a while back. Is there any progress on these matters? Is someone working on it? I need Jack as it is a dependency to another library I would like to use but I realize that I might have to abandon MacOS as a platform in the process. Kindest regards, Stefan

5 years, 9 months

[Jack-Devel] Edit WAF Script for Experimental Jack Backend

by Christoph Kuhr

Hi *, I am programming on an experimental Jack backend for AVB. I have a single source/header file but I need to link against a C library as well. How would I integrate the backend with the waf script? Thx, Ck

6 years, 3 months

[Jack-Devel] audioadapter: quality setting important when not changing sampling frequency?

by Holger Marzen

Hi all, since I only need one microphone when recording I am happy with my Focusrite Scarlett 2i4. I use the 2i4 for recording and direct monitoring with the line outputs feeding a headphones amp. I use the builtin headphones amp as well, both when recording and for mixing. So far, so good. Then I wanted 2 additional outputs to feed my active speakers (Neumann KH120A plus KH805 sub). Because of my room's damping of the high frequencies (at least compared to my headphones AKG K812) I need an EQ before them. So I use a Scarlett 2i2 for this purpose, with CALF Jackhost and a Calf EQ feeding this outputs. Now I have 2 audio interfaces that can't be synchronized with a wordclock cable. So I have to drive the 2i2 for the speakers in an async way. Since I use this output only for mixing/mastering I can live with some additional latency. I tried several ways to use the 2nd interface: - alsa_out - zita_j2a - audioadapter (jack_load -i "-dhw:2 -q0 -n2 -p128 -r48000" 2i2 audioadapter) The audioadapter is the most robust solution and doesn't crash when I resize jackd's bufsize on the fly, so I'd like to stay with it. As I played around with the quality setting (-q0 ... -q4) I noticed an enormous CPU load with -q4 (sinc) but couldn't hear any differences in audio quality. -q0 sounds as good as -q4. Now my question: When the audioadapter has to resample to the same frequency (from 48000 to 48000), do higher -q settings improve the audio quality? As I understand there is no interpolation needed at all so -q0 would be enough to have a perfect audio quality. Any comments/ideas to this? Regards Holger

6 years, 3 months

[Jack-Devel] [ANN] QjackCtl 0.5.4 - An Early Autumn'18 Release

by Rui Nuno Capela

That's it! QjackCtl 0.5.4 (early-autumn'18) is out! QjackCtl [1] is a(n ageing but still modern, maybe not so 'simple' anymore) Qt [2] application to control the JACK [3] sound server, for the Linux Audio [5] infrastructure. Website: https://qjackctl.sourceforge.io http://qjackctl.sourceforge.net Project page: http://sourceforge.net/projects/qjackctl Downloads: http://sourceforge.net/projects/qjackctl/files - source tarball: http://download.sf.net/qjackctl/qjackctl-0.5.4.tar.gz - source package (openSUSE Tumbleweed): http://download.sf.net/qjackctl/qjackctl-0.5.4-33.rncbc.suse.src.rpm - binary package (openSUSE Tumbleweed): http://download.sf.net/qjackctl/qjackctl-0.5.4-33.rncbc.suse.x86_64.rpm - AppImage [7] package: http://download.sf.net/qjackctl/qjackctl-0.5.4-5.x86_64.AppImage Git repos: https://git.code.sf.net/p/qjackctl/code https://github.com/rncbc/qjackctl.git https://gitlab.com/rncbc/qjackctl.git https://bitbucket.com/rncbc/qjackctl.git Change-log: - Graph port-type colors are now configurable (cf. menu View > Colors. - Make Graph nodes (ie. client boxes) transparent for yet some eye-candiness ;). Also keep the (Graph) current selection across port (dis)connections. - Drawing patchbay connector lines as (bezier) curves is now a difinitive and fixed feature (as long as no moreremains from the so called "Cambric explosion era" are still lurking in there). - AppStream metadata updated to be the most compliant with latest freedesktop.org specification and recommendation. - Graph auto-layout improvement for brand new node clients. - Avoid showing setup warning when no server settings have changed. - Fixed JACK D-Bus settings for MIDI driver parameter. License: QjackCtl [1] is free, open-source Linux Audio [5] software, distributed under the terms of the GNU General Public License (GPL) version 2 or later [6]. See also: http://www.rncbc.org/drupal/node/1941 References: [1] QjackCtl - A JACK Audio Connection Kit Qt GUI Interface https://qjackctl.sourceforge.io http://qjackctl.sourceforge.net [2] Qt framework, C++ class library and tools for cross-platform application and UI development http://qt.io/ [3] JACK Audio Connection Kit http://jackaudio.org [4] ALSA, Advanced Linux Sound Architecture http://www.alsa-project.org/ [5] Linux Audio consortium of libre software for audio-related work http://linuxaudio.org [6] GPL - GNU General Public License http://www.gnu.org/copyleft/gpl.html [7] AppImage, Linux apps that run anywhere http://appimage.org/ Enjoy && have fun! (what else?) -- rncbc aka Rui Nuno Capela

6 years, 3 months

[Jack-Devel] Focusrite Scarlett USB interfaces: 48000 preferred over 44100?

by Holger Marzen

Hi all, I have several Focusrite Scarlett USB interfaces: - Solo - 2i2 - 2i4 They work out of the box but I noticed some flaw in either their firmware or ALSA or jackd: - with 48000 I can use much lower buffer sizes (down to 32) as with 44100 (at least 96) - with 44100 I have some slight clicks, about one per minute, sometimes less. Those clicks sound as if an electrical device (refrigerator, lights) was switched on. - with 48000 I have no such clicks. Has anyone made the same experiences? With Scarletts? With other USB-Interfaces? Is jackd or ALSA optimized for multiples of 48000 instead of 44100? Regards Holger

6 years, 4 months

[Jack-Devel] Jack on Win7 with DirectSound devices?

by Rick Bidlack

Hi, Perhaps a newbie question, but the available information is somewhat contradictory. I'm under the impression that the Jack server on Windows only works with ASIO devices, along the lines of: jackd -R -S -d portaudio -d "ASIO::<device name here>" Is it possible to instead use a DirectSound device? Documentation indicates that it should be, but on my machine any variation like this fails: jackd -R -S -d portaudio -d "DirectSound::<device name here>" Am I missing something, or is it in fact not currently possible to to connect to a directsound device? -Rick

6 years, 4 months

[Jack-Devel] Problem with RME babyface pro :-(

by Elekim86

Hi guys and thx for reading! I can't use my rme babyface pro with jack to route audio form cubase 9.5 pro to harrison mixbus32c v4 :-( Jack works with the asio4all v2, but if I setting "C:\Program Files (x86)\Jack\jackd.exe" -R -S -d portaudio -d "ASIO::ASIO Fireface USB" in jackd proprieties and ASIO::ASIO Fireface USB as interface in jack audio connecting kit settings nothing hapens :-( 0 signal in cubase! The meters don't move as I setted no driver in cubase. Any tips? where did I wrong? Help please!!!! ps. I tried to use asio4all as driver for jack setting ASIO::ASIO Fireface USB as interface in jack audio connecting kit settings and the sound appeared! But it glitch a lot... heeeeeelp T_T thx guys and sorry for my english! -- Sent from: http://jack-audio.10948.n7.nabble.com/Jackit-f3.html

6 years, 4 months

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JackAudio September 2018