Linux-audio-user November 2011

linux-audio-user@lists.linuxaudio.org

84 participants
73 discussions

Re: [LAU] A different direction in music - Whisper

by Yvonnick Noel

Julien, I react with some delay, but I listened to this piece very early this morning. Everything was quiet in the house. I had the headphones and was very concentrated on it. It *really* moved me. This is the second piece I ear from you. With the same pleasure (not that I want to put too much pressure on you :-) ) Thanks a lot. Yvonnick Noel

13 years, 4 months

Realtime priority when using several cards as MIDInterface

by Ralf Mardorf

I'm using a RME card for audio and MIDI and two Envy24 cards for MIDI. Using rtirq with it's default in /etc/rtirq.conf, resp. /etc/default/rtirq resp. /etc/sysconfig/rtirq RTIRQ_NAME_LIST="rtc snd usb i8042" caused PID CLS RTPRIO NI PRI %CPU STAT COMMAND 55 FF 90 - 130 0.0 S irq/8-rtc0 659 FF 85 - 125 0.0 S irq/20-ICE1712 671 FF 85 - 125 0.0 S irq/21-ICE1712 652 FF 83 - 123 0.1 S irq/18-hdspm switching to RTIRQ_NAME_LIST="rtc hdspm snd usb i8042" resulted in PID CLS RTPRIO NI PRI %CPU STAT COMMAND 55 FF 90 - 130 0.0 S irq/8-rtc0 619 FF 85 - 125 0.1 S irq/18-hdspm 629 FF 80 - 120 0.0 S irq/20-ICE1712 631 FF 80 - 120 0.0 S irq/21-ICE1712 Dunno, perhaps RTIRQ_NON_THREADED="rtc snd" should also be edited. Anyway, thanks to coincidence I noticed this issue and thanks to Rui I was able to correct the priority. My intend is to inform users of several PCI, PCIe MIDInterfaces to take care about priorities, when one of the devices additionally is used for audio too. I didn't test if there's an audible difference on my machine, I suspect that there isn't any difference, but IMO even this could be the cause for an issue. FWIW, I also own an USB MIDI device, a nice addition for non-rt bulk dump, for my needs useless to make music. I guess if I wouldn't use those Envy24 cards as MIDInterfaces, the RME would have first priority after the clock. - Ralf

13 years, 4 months

[semi-OT] PhD position at IEM: Sonification research

by Peter Plessas

Dear List, forwarding this job posting, as people on this list could be interested: best, P ------------------------------------------------------------------------ Job posted by Institute of Electronic Music and Acoustics/ University of Music and Performing Arts Graz (23/11/2011) PhD student in Sonification Research (Audio Engineering/ Climate Science) Applications are invited for a postgraduate student to join the Institute for Electronic Music and Acoustics (IEM, http://iem.kug.ac.at) at the University of Music and Performing Arts Graz for the FWF funded project SysSon – A systematic procedure to develop sonifications. The goal of SysSon is the systematic development of sonifications - from finding sound metaphors and creating a ‘sound library’ to aesthetic/ scientific evaluation and finally the sonification tool ‘ClAudio-Climate Audio’. The procedure is developed with and tested on data from Climate Science. Main researchers of the project (and supervisors of the PhD) are R. Höldrich and K. Vogt at IEM, where the PhD student will be based. Cooperation partners are the Wegener Center for Climate and Global Change (www.wegcenter.at) and the Center for Systematic Musicology (www.uni-graz.at/en/muwi99ww). The PhD will comprise the application of the procedure to data from climate science: handling data compatibility issues, sound synthesis, co-development of evaluation test design, finalizing of ClAudio, and supporting of sound installation. The position is available from 1st February 2012 and financial support is guaranteed for 2 1⁄2 years (an additional half year of support for writing up the thesis is envisaged). Salary will be paid according to www.fwf.ac.at („Personalkostensätze“ – „DoktorandIn“). The closing date for applications is 25th December 2011. (Skype) interviews are planned for January. Female applicants are preferentially considered in case of equal qualification. We expect: + A Master’s degree in audio engineering and electrical engineering or computer science or similar, who have a solid scientific background in acoustics, sound synthesis and auditory perception. An additional background in sciences (physics/ climate science) is beneficial. Candidates about to earn their degree are welcome to apply. + Familiarity with programming languages (either SuperCollider3 or Pure Data; plus other programs such as Max MSP, MATLAB, etc.) is a precondition. + High motivation for interdisciplinary and application-oriented work and a special interest for sonification research. + An integrative and cooperative personality. + Very good communication skills in English. We offer: + A top-level research environment at the edge of technology and the arts; the IEM is considered to be Austria’s leading research institution in the field of audio engineering with the three research areas Artistic Research, Signal Processing and Acoustics, and Computer Music (including sonification). + Efficient supervision by an interdisciplinary team of supervisors, strong communication and interaction between the involved institutions. + The location in Graz – a city of five universities (two are involved in SysSon) and cultural capital of Europe 2003, hosting internationally renowned festivals such as steirischer herbst and Elevate. Please send your applications (in English or German) to vogt(at)iem.at including: + letter of motivation or résumé + CV + copy of relevant university diplomas + a short exposé (1-2 pages) on a previous project related to audio engineering, sonification or similar (sound examples –or their links- are welcome)

13 years, 4 months

send midi (CC)messages

by thijs van severen

hi all i'm looking for a simple app (gui or command line) that can simply generate a single midi message. I would like to be able to feed all data into it and then press the 'send-midi-message-button' ;-) the goal is to send midi messages to an external hardware audio FX unit (that has a midi input) to select a specific program on that unit any suggestions ? grtz Thijs -- follow me on my Audio & Linux blog <http://audio-and-linux.blogspot.com/> !

13 years, 4 months

Another call for brave testers: new Guitarix LADSPA plugins

by Andreas Degert

Hi, we'd like to ask those who are interested in the new Guitarix LADSPA plugins to run them on their systems and give us some feedback. They do fine on our own machines and seem to be fit for wider testing. The plugins "Guitarix Amp" and "Guitarix Stereo Fx" wrap all of the entire sound engine of Guitarix. You can load a preset that you defined with the Guitarix program, and even define some parameters for DAW automation. It's explained in our wiki: https://sourceforge.net/apps/mediawiki/guitarix/index.php?title=How_to_use_… Our SVN: svn co http://guitarix.svn.sourceforge.net/svnroot/guitarix/trunk guitarix After checkout, build with ./waf configure && ./waf && sudo ./waf install for an installation to /usr/local. Our tracker: http://sourceforge.net/tracker/?group_id=236234 Your feedback will be welcome here or there or anywhere.. Or in our forum: http://sourceforge.net/apps/phpbb/guitarix/ so please, don't be shy and tell us your test results or if you think the concept is usable / unusable :-) ciao Andreas

13 years, 4 months

RT in Arch Linux

by James Morris

Hi, Just wanting to know what people are doing for RT audio on Arch Linux? Have got a bit out of the loop on these matters. Not entirely sure what I had configured before... Think it was just the standard kernel, but since 3.1 (possibly) (or a couple of weeks ago) I'm informed that "JACK is running in realtime mode, but you are not allowed to use realtime scheduling." Any help appreciated. James

13 years, 4 months

Re: [LAU] [LAA] LV2 6.0 Released

by Chuck Martin

On Mon, Nov 21, 2011 at 09:25:04PM -0500, David Robillard d-at-drobilla.net wrote: > The lv2config tool no longer exists. Specification packages simply > install their headers to the appropriate locations. Thanks a *lot* for this. Creating a package on a machine that doesn't already have lv2core installed will be *much* easier. Chuck

13 years, 4 months

Audio/Video massive out-of-sync, lockup

by Ken Restivo

I'm trying to use mplayer to play a video made on my G2 Android. The sound does like two choppy samples of 250ms each and then stops. The video plays for a few seconds then locks up, no matter how long the video is. If I play it with -nosound, the video plays fine (if a little slow). But with sound, it's no dice. ffmpeg -i says the following about it: [mov,mp4,m4a,3gp,3g2,mj2 @ 0xb7ecf680]edit list not starting at 0, a/v desync might occur, patch welcome Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'VID_20111121_111728.m4v': Duration: 00:01:14.56, start: 0.000000, bitrate: 5930 kb/s Stream #0.0(eng): Audio: libfaad, 32000 Hz, stereo Stream #0.1(eng): Video: h264, yuv420p, 1280x720, 90000.00 tb(r) So, hmm. What's this 90000.00 tb(r) about? Everything else seems to make sense to me, 5.930Mb/s bitrate, theh audio and video codecs, etc. Any idea how I can get mplayer (an admittedly old version) to play it? -ken

13 years, 4 months

Some heavy stuff and some weird stuff made with linux

by Arve Barsnes

Probably not the greatest display of what you can do with a linux box this, but we just released two albums and an ep yesterday. The albums are grindcore of the short variety (both albums are 19 songs in just above 2 minutes), but the ep (The Piece.....) is a simple acoustic song in 5/4 with some weird stuff on top. Even managed to use zita-at1 in there. It'll only take you 7 minutes to listen to all the three releases, so take a listen to the band that only exists because we thought it was funny that noone had ever used this word in a bandname before ;p http://constipation.bandcamp.com Regards, Arve

13 years, 4 months

a little web based ear training application

by Tony Austin

I recently discovered this very nice little application http://www.good-ear.com/servlet/EarTrainer?chap=0&menu=0 It runs well with Firefox on Windows but I have not had any success in getting any sound from its little built-in player. I have tried fiddling with the QuickTime plugins, selecting various midi add-ons, using mozplugger plugin, JACK on/off but no luck so far. Does anyone have any ideas that I could try to make it play? Tony

13 years, 4 months

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Linux-audio-user November 2011