Linux-audio-user May 2016

linux-audio-user@lists.linuxaudio.org

58 participants
48 discussions

[linux-audio-user] Sub-harmonic generator? (LADSPA or VST)

by Tim Howard

Hello, Does anyone know of a good plugin that will generate subharmonics? I would like to put a little more low frequency "oomph" into my bass track. Preferrable LADSPA, but VST would work, too. Thanks for any help! -TimH

7 years, 7 months

music made with Linux+Ardour -- "demonstrate"

by Wayne DePrince Jr.

PreScript: apologies for prematurely sending this email unfinished: on the road, with a foreign keyboard and up too late rarely results in anything good!! ahoy all, first, thanks for all the music, tools, tips and time that all of you have shared in this community. i have been following these lists for some time, getting lots of help and inspiration as i stumbled my way around the GNU+Linux audio world. and now i am happy to share something as well: "demonstrate (from where to Now: volume 2)" by our music group "in-giro" http://in-giro.xyz created mainly with Ardour 3 alpha/beta (thanks Carl and Paul especially for all the MIDI help!), the album was recorded "in giro" (Italian for roughly "in motion, on the move"), in all aspects of the phrase. the suite is a rock opera, with tracks 1-9 (of 10) flowing gaplessly. thus, i recommend downloading the album (free) to (hopefully!) enjoy it as intended from the first track onward. currently the 'web site' is just a very thin veneer around the ubiquitous Bandcamp widget, (with the so-called 'single', track 7, playing if no other track is selected), so there will unfortunately be awkward pauses between the songs if streamed directly. as further incentive to listen offline, the downloaded ZIP file also includes the libretto PDF containing hand-drawn lyrics, additional artwork and credits. speaking of credits, i would like to mention in particular 2 people who i met on these lists while developing "demonstrate": - long time GNU+Linux audio engineer Rich Wielgosz http://richwielgosz.com mixed+mastered the album, IMHO doing a great job with some sketchy source material (we are learning how to record as we go!) - musician, composer and list contributor Q https://soundcloud.com/quirq-uk helped with production and creative feedback finally, i would appreciate any comments: technical, creative, proper email etiquette, whatever! thanks sincerely in advance for taking the time to read/listen. peace, w PostScript: i am currently on the road for a good bit, so while i will eventually respond to any replies, please be aware that it may take some time ;) PostPostScript: apologies again for the double post and false start!!!!

7 years, 10 months

RFV: LV2 Gtk2 UIs crashing Qt5 QTractor and MusE at same place

by Tim E. Real

Hi list. Requesting verification of a bug: After upgrading from *buntu 14.04 LTS to 16.x, the LV2 Gtk2 UIs such as Calf and others crash upon opening them in both Qt5 QTractor and Qt5 MusE-3, at these similar calls: QTractor: In qtractorLv2Plugin.cpp QWidget *pQtContainer = QWidget::createWindowContainer(pQtWindow, pQtWidget); MusE: In lv2host.cpp: ewWin = QWidget::createWindowContainer(x11QtWindow); The crash ultimately happens deep inside the Qt5 libraries at the same place in both apps : QXcbWindow::setParent() I tried building Calf from source release, and tried different video cards. NG. But... If I bypass createWindowContainer() in MusE the UIs open and work fine! (Just that now of course they are outside of the container window.) It's Qt 5.5.1 I read about a bug fix and revert where they assumed always a valid screen but then had to revert, but that's supposed to be fixed now. I'm confused. Is it just me getting these crashes? Thanks. Tim.

7 years, 10 months

Music (and Video) Made with Linux - Rated Blue Live

by Glen MacArthur

Hi, This past March my band 'Rated Blue' had a CD Release party for our EP 'Three Walls Down' we set up 3 cameras and filmed it and I hadn't looked at the footage until recently when I decided to take a stab at editing it with Cinelerra-CVA (the custom version found in AV Linux). In addition I post-processed the camera Audio in Ardour 4.7 from the 3 camera audio tracks. The videos range from clips to full songs and feature some original songs from Three Walls Down, some songs to be on our next full length album to be recorded this summer and some of our favorite covers. I've kind of lost all objectivity about the actual songs and performances, but we had a great turnout of over 100 people for the show and I got to share the stage with both family and friend so to me the footage is worth preserving for that reason alone. Despite all the bitching out there about Cinelerra Video Editor I found working with it and managing and aligning 3 separate streams of audio/video + titles to be very easy, straightforward and so far with about 20+ hours of editing time invested I've only had one crash. Post production of the Audio in Ardour was also effortless as expected. Lastly the overlay titling was done in GIMP. The OS used was AV Linux 2016 64bit. For anyone interested in having a look check out our Youtube Channel: https://www.youtube.com/channel/UCRnzR1xKKy4wjnJIDMeY2wA Thanks, Glen

7 years, 11 months

render a spectrogram with logarithmic frequency axis from bash

by Peter P.

Hi list, I am trying to render a spectrogram from a soundfile as I would do using the SoX spectrogram effect, or sndfile-spectrogram from sndfile-tools but with a logarithmic frequency axis. It is alright if the analysis remains linear, but the plotting should be done in log. Is there any solution that can be used on a shell without gui, and that is slightly less work than writing it in Octave? Thank you for all recommendations! best, Peter

7 years, 11 months

Apply plugin effects to a sound file using the CLI

by Yassin Philip

Hi list! I'm recording screencasts with ffmpeg, and I'd like to add compression and a bit of reverb to the voice track afterwards, is there a cool, scriptable way to do that? yPhil -- Yassin "xaccrocheur" Philip http://manyrecords.com http://bitbucket.org/xaccrocheur / https://github.com/xaccrocheur

7 years, 11 months

Re: [LAU] realtime priority - FIFO vs Round Robin and scheduling

by Kjetil Matheussen

> Luka Prin?i? / Nova deViator: > > Renoise seems to be running some threads with FIFO scheduler with a > priority that is _below_ that of JACK and firewire driver (correct > right?), but ALSO some threads using Round Robin scheduler with VERY > HIGH RT priority of 95. my question is if this is a possible cause for > glitches and XRUNS? This thread could be a watchdog thread, in which case a priority of 95 should be unproblematic. The glitches and XRUNS you see are probably due to other reasons than thread priorities. Renoise is probably doing some time consuming things in the jack thread, or is the victim of priority inversion, or waiting for a non-realtime thread doing some work.

7 years, 11 months

music made with Linux+Ardour

by Wayne DePrince Jr.

ahoy all, first, thanks for all the great music, tools, tips and time that many of you have produced and shared in this great community, always very inspiring. i have been following these lists for some time, getting lots of help as i stumbled my way around the GNU+Linux audio world. i am happy to present my small contribution: "demonstrate (from where to Now: volume 2)" by our music group "in-giro" http://in-giro.xyz created mainly with Ardour 3 alpha/beta (thanks Carl and Paul especially for all the MIDI help!), the suite was recorded "in giro" (Italian for roughly "in motion, on the move"), in all aspects of the phrase. it is a type of abstract rock opera, with characters and recurring themes both lyrical and musical. included in the downloaded ZIP file is the libretto PDF with hand-drawn lyrics, credits and additional artwork. some help from Q mixed+mastered by long time GNU+Linux supporter Rich Wielgosz http://richwielgosz.com . currently the 'site' is a simple embed of the Bandcamp widget ( -- http://waynedpj.in-giro.xyz

7 years, 11 months

#musicmadewitlinux - Arctic Auscultate

by Patrick Shirkey

Hi, Some of you might enjoy this downtempo track which has a selection of samples taken from archival material recorded in the Arctic ocean over 30 years ago. https://youtu.be/RC82Xu5Al6w Seems to provide something to ponder given the current temperature at the Arctic and other recent meteorological data like the sustained 400ppm that we are now seeing in the Southern Hemisphere. Be warned! We are entering new territory here so this might not be to everyones taste... -- Patrick Shirkey Boost Hardware Ltd

7 years, 11 months

Jconvolver on Raspberry Pi B / PI Zero

by bricolodu

Hello, I'm tryng to make jconvolver to work on Pi B (for a Pi Zero setup when it will be available to me) I had a setup working fine with Pi 2 and Pi 3 I did a fresh MINIMAL install on Pi B Jackd is running but each time I try to start jconvolver I get an error : Illegal instruction Here is my asound.conf # Send both CHANNELS alsa API to jconvolver pcm.rawjack { type jack playback_ports { 0 jconvolver:in.L 1 jconvolver:in.R } capture_ports { 0 system:out_L 1 system:out_R } } # jackplug pcm.jack { type plug slave { pcm "rawjack" } hint { description "JACK Audio Connection Kit" } } # use following peripherical by defaut with alsa: pcm.!default { type plug slave { pcm "rawjack" } } Here is my Filter.conf GNU nano 2.2.6 File: filter-44100.conf # in out partition maxsize # --------------------------------------------------------------- /convolver/new 2 2 1024 65536 # num port name connect to # ----------------------------------------------- /input/name 1 in.L rawjack:out_000 /input/name 2 in.R rawjack:out_001 # /output/name 1 out.L system:playback_1 /output/name 2 out.R system:playback_2 # # in out gain delay offset length chan file # -------------------------------------------------------------------------- /impulse/read 1 1 0.85 0 0 0 1 highpass_44.wav /impulse/read 2 2 0.85 0 0 0 1 highpass_44.wav # Then : *STEP 1 (OK)* root@DietPi:~# jackd -d alsa -d hw:Audio -r 44100 -p 256 -n 2 -P -s jackdmp 1.9.10 Copyright 2001-2005 Paul Davis and others. Copyright 2004-2014 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 JACK server starting in realtime mode with priority 10 self-connect-mode is "Don't restrict self connect requests" creating alsa driver ... hw:Audio|-|256|2|44100|0|0|nomon|swmeter|soft-mode|32bit configuring for 44100Hz, period = 256 frames (5.8 ms), buffer = 2 periods ALSA: final selected sample format for playback: 24bit little-endian ALSA: use 2 periods for playback *STEP 2* root@DietPi:~/jconv/filter# jconvolver filter-44100.conf Illegal instruction Any Idea of what is wrong here ? -- View this message in context: http://linux-audio.4202.n7.nabble.com/Jconvolver-on-Raspberry-Pi-B-PI-Zero-… Sent from the linux-audio-user mailing list archive at Nabble.com.

7 years, 11 months

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Linux-audio-user May 2016