JackAudio January 2018

jackaudio@lists.linuxaudio.org

22 participants
18 discussions

Re: [Jack-Devel] Using USB sound card with Jack

by Chris Caudle

On Sun, January 28, 2018 9:34 am, Benny Alexandar wrote: > After starting jack server using qjackctl What jack settings were used in qjackctl? Which driver was chosen, and which interface? > Then in qjackctl connected the graph as shown in the attached picture. That graph works if j2a is controlling the sound card, if jack was started with the ALSA driver and the USB device as the interface then jackd would already be controlling the sound card. When providing information it will save a lot of time if you actually copy and past the command line you used as well as the resulting messages. For example you stated that you started zita-a2j, did you start zita-j2a with the same command line parameters as zita-a2j? What status messages were printed at that time? What was in the messages window of qjackctl (that is where the output from the jackd server is displayed)? You have given about a fourth of the information needed to help you determine what is happening on your system. -- Chris Caudle

6 years, 7 months

[Jack-Devel] Problem with uninstalling Jack Audio Windows 10 / Problème avec désinstallation de Jack Audio Windows 10

by Vincent NICOLAS

Hello, Hello, I tried to configure Jack control (Jack_v1.9.11_64_setup.exe) to bind Traktor to Ableton but the solution did not suit me, I uninstalled Jack Audio control and since then I can not launch the TRAKTOR 64-bit application . I can still launch TRAKTOR in 32 but the uninstall has removed something that blocks the software. Thank you for your help. Vincent Bonjour, J'ai essayé de configurer Jack control (Jack_v1.9.11_64_setup.exe) pour lier Traktor vers Ableton mais la solution ne me convenant pas, j'ai désinstallé Jack Audio control et depuis je ne peux plus lancer l'appli TRAKTOR en 64 bits. Je peux encore lancer TRAKTOR en 32 mais la désinstallation à enlevé qelque chose qui bloque le logiciel. Merci de votre aide. Vincent

6 years, 7 months

[Jack-Devel] Problem with uninstalling Jack Audio Windows 10 / Problème avec désinstallation de Jack Audio Windows 10

by Vincent NICOLAS

6 years, 7 months

Re: [Jack-Devel] Using USB sound card with Jack

by Chris Caudle

On Tue, January 23, 2018 10:12 am, Benny Alexandar wrote: > Any documentation on how to use the jack_delay for measuring ? $ man jack_iodelay NAME jack_iodelay - JACK toolkit client to measure roundtrip latency SYNOPSIS jack_iodelay DESCRIPTION jack_iodelay will create one input and one output port, and then measures the latency (signal delay) between them. For this to work, the output port must be connected to its input port. The measurement is accurate to a resolution of greater than 1 sample. The expected use is to connect jack_iodelay's output port to a hardware playback port, then use a physical loopback cable from the corresponding hardware output connector to an input connector, and to connect that corresponding hardware capture port to jack_iode‐ lay's input port. This creates a roundtrip that goes through any analog-to-digital and digital-to-analog converters that are present in the audio hardware. Although the hardware loopback latency is the expected use, it is also possible to use jack_iodelay to measure the latency along any fully connected signal path, such as those involving other JACK clients. Once jack_iodelay completes its measurement it will print the total latency it has detected. This will include the JACK buffer length in addition to any other latency in the signal path. It will continue to print the value every 0.5 seconds so that if you wish you can vary aspects of the signal path to see their effect on the measured latency. If no incoming signal is detected from the input port, jack_iodelay will print Signal below threshold... . every second until this changes (e.g. until you establish the correct connections). To use the value measured by jack_iodelay with the -I and -O arguments of a JACK backend (also called Input Latency and Output Latency in the setup dialog of qjackctl), you must subtract the JACK buffer size from the result. The buffer size is determined by multiply‐ ing the number of frames per period (given to the jackd backend by the -p or --period option) by the number of periods per buffer (given to the jackd backend by the -n or --nperiods option). Note that JACK2 will add an implicit additional period when using the default asynchronous mode, so for JACK1 or JACK2 in synchronous mode, the buffer size is n*p, but for JACK2 in asynchronous mode the buffer size is (n+1)*p. Once the JACK buffer size is subtracted from the measured latency, the result is the "extra" latency due to the interface hardware. Then, if you believe that the latency is equally distrib‐ uted between the input and output parts of your audio hardware (extremely likely), divide the result by two and use that for input and output latency values. Doing this measure‐ ment will enable JACK clients that use the JACK latency API to accurately position/delay audio to keep signals synchronized even when there are inherent delays in the end-to-end signal pathways. AUTHOR Originally written in C++ by Fons Adriaensen, ported to C by Torben Hohn. 1.9.10 August 2017 JACK_IODELAY(1) -- Chris Caudle

6 years, 7 months

[Jack-Devel] Question regarding the Jack API and compiling Errors

by DaemoniumAer

Could someone please have a look at this <https://stackoverflow.com/questions/48336952/fail-to-compile-source-with-ja…> ? I have been trying to solve this for far too long hoping I could figure it out by myself. I really want to start using JACK in my project though and I am getting kind of frustrated. Maybe someone could tell me what they have running on their machine? Distro/Compiler/Compiling Arguments/Any other Programs/... Every help is appreciated :) If you feel like something doesn't add up, I am happy to retry everything. Kind regards, Ariel -- Sent from: http://jack-audio.10948.n7.nabble.com/Jackit-f3.html

6 years, 7 months

Re: [Jack-Devel] Using USB sound card with Jack

by Chris Caudle

On Tue, January 16, 2018 10:36 am, Benny Alexandar wrote: > I want to test how zita-ajbridge behaves when there is a drift in clock. > Any idea how to artificially create clock drift for testing purpose. The clocks are going to naturally drift if they are not synchronized externally. In a lab environment I would use a frequency generator on a device that could provide a S/PDIF stream for one of the devices to lock to, and slowly vary the frequency. Without lab equipment the best you could do would be to change the temperature of the crystal that controls the sampling rate for one of the devices. Typically the equipment would be running around 30 degrees C, but the components should be able to handle up to 50 degrees or 60 degrees C, and down to about 0 degrees. The quartz oscillators will vary in frequency several PPM as the temperature swings. Just be careful not to swing the temperature too quickly, you could crack a solder joint, or potentially cause the clock generator to lose sync if the frequency changes faster than any PLL can track. Assuming you don't have any lab rework equipment that can generate controlled temperature air over a small area, your best bet might be a hair dryer on low, and control the temperature by distance from the blower. -- Chris Caudle

6 years, 8 months

[Jack-Devel] Using USB sound card with Jack

by Benny Alexandar

Hi, I'm using latest jack audio server version jackd 1.9.12. I have built simple client.c app and able to capture audio from microphone input and play it out. I have another USB soundcard which is connected to pc through USB. How to get input from USB soud card ? After connecting USB sound card and when printed the ports[] array after executing the jack API jack_get_ports() I could see only PC microphone capture ports, not showing USB ports. -ben

6 years, 8 months

[Jack-Devel] LAC 2018 : Call for Papers / Posters / Workshops/ Music Performances / Multimedia Installations

by Robin Gareus

[Apologies for cross-postings] [Please distribute] Conference date: 7th - 10th June 2018 The Linux Audio Conference 2018 will be hosted at c-base, Berlin - in partnership with the Electronic Music Studio (TU Berlin) and Spektrum. https://lac.linuxaudio.org/2018 Deadline for all submissions: Friday, February 28th, 2018 (23:59 UTC) - - - 1: Call for Papers / Posters / Workshops LAC 2018 invites submissions of papers, posters and workshops addressing all areas of audio processing based on Linux and open source software. All submissions and presentations are in English. All submissions are peer reviewed by a committee of experts from different disciplines. Submissions can focus on technical, artistic or scientific issues and can target developers or users. For more details see the website: https://lac.linuxaudio.org/2018/pages/cfp/ *Papers* Papers must be written and presented in English. The length of papers is 4 to 8 pages, with up to 5 keywords, and an abstract of up to 200 words. The poster presentations are based on paper submissions of 2-4 pages, with up to 5 keywords and an abstract of up to 150 words. *Workshops* The workshop presentation (max duration of 2h) should be 1-4 pages, with up to 5 keywords, and an abstract of up to 150 words to be published on the conference website. Submit a brief description of the workshop including URL (if available). How to submit? * Use the OpenConf online submission tool at https://lac.linuxaudio.org/2018/openconf * Select the relevant submission type ('_ PAPER _' / '_ POSTER _' / '_ WORKSHOP _') * The required file format is PDF, formatted for A4 paper. Authors are required to use the templates for paper formatting available as download on the conference website. * Please notify us if you need a special technical setup for your presentation. - - - 2: Call for Music Performances / Multimedia Installations LAC 2018 also invites submissions of Electroacoustic Works and Multimedia Installations. A jury will select the compositions and installations to be included in the conference program according to artistic merit and technical feasibility. Please be prepared to perform your work yourself and make sure that you have all resources needed to perform your piece at your disposal (e.g. instruments, other performers, etc.). Unfortunately, LAC 2018 cannot pay a fee neither for you nor for any additional performers, and LAC 2018 cannot organize or pay for travel or accommodation neither for you nor for any additional performers. All submissions are peer reviewed by a committee of experts in music and arts. Electroacoustic Works and Multimedia Installation can address all areas of digital audio and audiovisual art. Available Technical Setups For concerts, the LAC will provide the following equipment: * 8-channel - speaker setup * Stereo setup + video projection * Digital mixing desk Additional requests can not be guaranteed. How to submit? * Use the OpenConf online submission tool at https://lac.linuxaudio.org/2018/openconf * Select the submission type '_ PERFORMANCE _' * The required file format is PDF, formatted for A4 paper. It includes: * Description of the project program notes * Link to video or audio demonstration of the project * Technical rider of the work Important Dates * Deadline for all submissions: Friday, February 28th, 2018 (23:59 UTC) * Acceptance notification: March 31st, 2018 * Final deadline for 'camera ready' paper: April 15th, 2018 * Author registration deadline: April 15th, 2018 * Final program: May 1st, 2018 Up-to-date information regarding the conference can be found on its website: https://lac.linuxaudio.org/2018 Looking forward to seeing you in Berlin! The Linux Audio Conference 2018 team

6 years, 8 months

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JackAudio January 2018