Linux-audio-user

linux-audio-user@lists.linuxaudio.org

3 participants
20662 discussions

by James Stone

Hi all, Sorry for this uneducated post, but I am sure there are many people here who know a lot more about this than me. This discussion about the Scarlett 18i8 has got me thinking about latency with USB devices. Is there an accepted buffer size that USB audio interfaces should be able to use with jackd now? I do seem to be getting xruns with 128/2 (even occasionally with 256/2 on program startup/shutdown), but I have not made any particular effort to try to tune my system for low-latency use. At 64/2, the sound breaks up in a kind of electronic sounding way (like a robot voice from the 70s), and linuxsampler (for example) complains the buffer size is too small.. Not quite sure what's going on there. I had a vague idea from discussions years back that there was a hard lower limit to usb latency, and that all devices, regardless of quality/chipset would share the same properties in terms of latency under USB. Presumably this is not the case any more (if it ever was??) Also, how meaningful is the reported jackd buffer size in terms of actual latency? When I was trying to help with fixing the kernel bug on my 2i4, I was told that the actual time between i/o packets was actually much lower than what was reported by jackd. Could this really be true? James

11 years, 10 months

acoustic alignment

by Patrick Shirkey

Hi, Interesting study here on the action of acoustic alignment of nanofibres in immersed in liquid. http://onlinelibrary.wiley.com/doi/10.1002/cplu.201300400/full It seems that classical music really does have the power to affect us physically at the nano level and in realtime. No doubt the researchers preferred to listen to classical music. What results might be seen with some of the other genres. -- Patrick Shirkey Boost Hardware Ltd

11 years, 10 months

FFMPEG on Debian and derivatives

by Patrick Shirkey

Hi. For those who are interested there is an RFP that has been running for a couple of months to get FFMPEG reinstated as either the default option or at least an option for Debian and derivatives such as Ubuntu instead of libav. http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=729203 You can post to this email address if you want to add your comment. 729203(a)bugs.debian.org Given the number of users here who have experienced issues with libav compared to ffmpeg it should be a no brainer. -- Patrick Shirkey Boost Hardware Ltd

11 years, 10 months

rmc fireface ucx / class compliant mode / 192khz

by tim

hi all, i've just connected my new fireface ucx to my linux machine. most of the stuff works fine, except that the mixer is a bit limited ... however i wonder, has anyone been able to run it with 192 khz? starting jack with 192khz gives me: > Thu Jan 9 20:58:20 2014: creating alsa driver ... hw:UCX23624905,0|hw:UCX23624905,0|1024|2|192000|0|0|nomon|swmeter|-|32bit > Thu Jan 9 20:58:20 2014: Using ALSA driver USB-Audio running on card 1 - RME Fireface UCX (23624905) at usb-0000:00:1d.0-1.2, high speed > Thu Jan 9 20:58:20 2014: configuring for 192000Hz, period = 1024 frames (5.3 ms), buffer = 2 periods ... but then it runs with 96khz ... thoughts? thanks a lot, tim

11 years, 10 months

Linux Audio Conference 2014 - Call for Participation (Reminder)

by Götz Dipper

[Sorry for cross-posting, please distribute] Just a friendly reminder that January 27th is the deadline for all submissions to the Linux Audio Conference (LAC 2014), which will take place at ZKM (Karlsruhe, Germany) in May 2014. http://lac.linuxaudio.org/2014/ We look forward to seeing you in Karlsruhe in May! Sincerely, The LAC 2014 Organizing Team - - - - - - - - - Linux Audio Conference 2014 - Call for Participation We are happy to announce the next issue of the Linux Audio Conference (LAC), May 1-4, 2014 @ ZKM | Institute for Music and Acoustics, in Karlsruhe, Germnany. http://lac.linuxaudio.org/2014/ The Linux Audio Conference is an international conference that brings together musicians, sound artists, software developers and researchers, working with Linux as an open, stable, professional platform for audio and media research and music production. LAC includes paper sessions, workshops, and a diverse program of electronic music. *Call for Papers, Workshops, Music and Installations* We invite submissions of papers addressing all areas of audio processing and media creation based on Linux. Papers can focus on technical, artistic and scientific issues and should target developers or users. In our call for music, we are looking for works that have been produced or composed entirely/mostly using Linux. The online submission of papers, workshops, music and installations is now open at http://lac.linuxaudio.org/2014/participation The Deadline for all submissions is January 27th, 2014 (23:59 HAST). You are invited to register for participation on our conference website. There you will find up-to-date instructions, as well as important information about dates, travel, lodging, and so on. This year's conference is hosted by the ZKM | Institute for Music und Acoustics (IMA). The IMA is a forum for international discourse and exchange and combines artistic work with research and development in the context of electroacoustic music. By holding concerts, symposia and festivals on a regular basis it brings together composers, musicians, musicologists, music software developers and listeners interested in contemporary music. Artists in Residence and software developers work on their productions in studios at the institute. With digital sound synthesis, algorithmic composition, live-electronics up to radio plays, interactive sound installations and audiovisual productions their creations cover a broad range of what digital technology can inspire the musical fantasy to. The ZKM is proud to be the place of the LAC for the fifth time after having initiated the conference in 2003. http://www.zkm.de/musik We look forward to seeing you in Karlsruhe in May! Sincerely, The LAC 2014 Organizing Team

11 years, 10 months

Re: [LAU] Focusrite Scarlett 18i8

by Chris Caudle

On Wed, January 8, 2014 7:41 am, linux-audio-user-request(a)lists.linuxaudio.org wrote: > I'm enquiring about this for a friend who needs an USB card to be > used with the RPi, with 4 mic inputs. Application is environmental > noise monitoring AFAIK. All suggestions welcome ! I believe that the Ethernet of the RPi is connected to the processor via USB, so if this application needs to remotely monitor the RPi status, the Ethernet traffic might cause problems for the audio interface since they share a USB connection. Should be checked thoroughly for multichannel use, I have heard complaints from people trying to build network connected music players with only two channel playback. -- Chris Caudle

11 years, 10 months

Linux/SuperCollider in action this month

by Marije Baalman

Hiho, Linux Audio will be in action quite a bit this month; showing two projects twice, so I thought it was worthwhile to post this. Both projects are controlled from SuperCollider, running on Linux, and involve the Sense/Stage wireless units. January 9 - 19: n-Polytope at Vitra Design Museum in Weil am Rhein (near Basel) January 18: performing Wezen at Rammelfest in Amsterdam. January 26 - February 23: n-Polytope at Stattbadt Wedding, as part of CTM Festival, in Berlin. February 1: performing Wezen at NK Projekt in Berlin. Previews: Wezen - https://vimeo.com/80685324 N-Polytope - https://vimeo.com/82416225 More info and event links: http://marijebaalman.eu Hope to see some of you at these events! sincerely, Marije

11 years, 10 months

wine-rt on debian stable

by Atte

Hi What's the easiest way to install wine-rt on a debian stable system? -- Atte http://atte.dk http://modlys.dk

11 years, 10 months

(no subject)

by karl＠aspodata.se

Is there anyone who knows how to remove bzzt's from an audio file? I tried to install gwc but it simply wants to many things I don't want. Are there any alternatives? I tried to use audacity's noise reduction, but that seems to care about contious noise, which this is not. It is recorded with ardour 2, and I cannot find any suitable plugin for this. /// It is from a consert with the local choir, first piece is: http://turkos.aspodata.se/tmp/01_ave_verum.flac The first few bzzt's are at 4.5, 11.5, 16.5, 21.5, 27.4, 30s into the track, every ~5s it seems. I suspect the new power supply, but havn't verified it yet. Regards, /Karl Hammar ----------------------------------------------------------------------- Aspö Data Lilla Aspö 148 S-742 94 Östhammar Sweden +46 173 140 57

11 years, 10 months

Jack Error, dbus, x11???

by Kevin Utter

Hi all! I'm running Ubuntu 12.10. I thought I had installed jack 2, but I think I did it manually if I remember correctly. As I've been having problems with recording audio, I checked with aptitude, and it showed that jack 1 was installed. I think the version command at the time showed 1 something, which I think indicates jack 2? I read that the --sync option was recommended, but that option didn't show up in the documentation. So, I elected to uninstall jack1 in aptitude, and install Jack 2. After doing this, jackd --version shows: jackdmp 1.9.8 Copyright 2001-2005 Paul Davis and others. Copyright 2004-2011 Grame. jackdmp 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 jackdmp version 1.9.8 tmpdir /dev/shm protocol 8 I'm trying to run jackd from a terminal outside of Infinity desktop. (A separate login, I think?) When I run jackd with the parameters I need, I get the following: Failed to connect to session bus for device reservation Unable to autolaunch a dbus-daemon without a $DISPLAY for X11 Failed to acquire device name : Audio0 error : Invalid argument Audio device hw:0 cannot be acquired... Cannot initialize driver JackServer::Open() failed with -1 Failed to open server Cannot connect to server socket err = No such file or directory Cannot connect to server socket jack server is not running or cannot be started If I run in a terminal inside Infinity, it starts OK. Can anyone explain what's going on, and what I can do to run it in other terminals? I'd like to be able to shut the display manager down if necessary to cut down on processes if necessary, as I'm doing everything from the command line. I had this working before, but I broke it when trying to fix things by installing jack2 with aptitude. Could I have had parts of different jack versions trying to co-exist? Or could I have been using a different version of jack or jackd when working from the terminal, and changing things in aptitude removed the one I had access to? I'm sorry if these are basic questions, but I've been trying to read documentation for months now, and because of conflicts of age and version changes, I'm just a bit confused. I have perhaps done stupid things along the line, but I just don't know quite where to go from here. Thanks much for any help, and I'm sorry to be so long-winded. I didn't know how to relate what I hoped would be all the details needed. Thanks again. Kevin

11 years, 10 months

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Linux-audio-user