Linux-audio-user September 2010

linux-audio-user@lists.linuxaudio.org

150 participants
121 discussions

by Jörn Nettingsmeier

by way of lennart's blog, i came across this very instructive video: http://0pointer.de/blog/projects/video.html xiph.org's head honcho monty deals with the basics of digital media. if all that signal theory technobabble has always freaked you out, here's a way to get your feet wet without too much discomfort.

14 years, 2 months

Re: [LAU] No batch processing on Linux?

by Marc Groenewegen

On Fri, Sep 24, 2010 at 3:05 PM, Robin Gareus <robin@xxxxxxxxxx> wrote: > ..and in case there are files with whitespaces in the filename, change > the default string separator: > > #/bin/bash > IFS=: > # do stuff > unset IFS Or remove spaces from all filenames. Why would one want spaces in filenames anyway ? To me it feels a bit like putting spaces in variable names, which isn't a good idea either. Cheers, Marc #! /bin/bash # # spaces2underscores.sh echo echo "This command changes all spaces in file names into underscores" echo " for ALL FILES IN THIS DIRECTORY !" echo " Type ENTER to continue or ^C to quit" read dummy for f in *; do oldname=`echo $f |sed 's/ /~/g'` newname=`echo $f |sed 's/ /_/g'` if [ $oldname != $newname ] then echo mv $f $newname mv "$f" $newname fi done

14 years, 2 months

[ANN] Qtractor 0.4.7 - The Furious Desertrix is out!

by Rui Nuno Capela

It's TYOQA (The Year Of Qtractor Automation:) what else? But wait, there's three months to go yet. Meanwhile, the foundations have already been laid and one can now tell that a rocky milestone is ready to get bumped. Ouch! Qtractor 0.4.7 (furious desertrix) is out! Release highlights: - MIDI learn/controller mapping for all plugin parameters (NEW) - Extended Clip fade-in/out WYSIWYG curves (NEW) - MIDI resolution overflow (FIX) - MIDI tempo standard base on quarter-note (FIX) - Extended MIDI controller mapping for mixer/tracks (NEW) - Audio metronome gain control (NEW) - Mute/solo tracks while looping (FIX) - MIDI Clock support (NEW) - Audio clip import while looping (FIX) - MIDI track bank-select/program-change transparency (FIX) - VeSTige headers included for native VST plugin support (NEW) - JACK transport sync support (FIX) - Clip tempo-adjust tool (NEW) - Audio tracks auto-monitoring (FIX) - Transport back/forward stops on loop points (NEW) - MIDI tracks redundant mute/solo (FIX) See also: http://www.rncbc.org/drupal/node/235 Website: http://qtractor.sourceforge.net Project page: http://sourceforge.net/projects/qtractor Downloads: - source tarball: http://downloads.sourceforge.net/qtractor/qtractor-0.4.7.tar.gz - source package (openSUSE 11.3): http://downloads.sourceforge.net/qtractor/qtractor-0.4.7-1.rncbc.suse113.sr… - binary packages (openSUSE 11.3): http://downloads.sourceforge.net/qtractor/qtractor-0.4.7-1.rncbc.suse113.i5… http://downloads.sourceforge.net/qtractor/qtractor-0.4.7-1.rncbc.suse113.x8… - user manual (nevermind outdated): http://downloads.sourceforge.net/qtractor/qtractor-0.3.0-user-manual.pdf Weblog (upstream support): http://www.rncbc.org License: Qtractor is free, open-source software, distributed under the terms of the GNU General Public License (GPL) version 2 or later. Change-log: - While moving multi-selected MIDI events around the clip editor (aka piano-roll), with help of keyboard arrow keys, that is, was not clear which one was the so-called "anchor" event, the one which positioning gets honored for snap-to-beat business. Not anymore: the anchor event now defaults to the earliest in time or the one the user's last point(-click)ed. - MIDI control observer pattern implementation has sneaked in, making it ready for the so-called and long-awaited "MIDI Learn" feature and arbitrary MIDI controller assignment, for plugin parameters in particular. - MMC DEFERRED PLAY doesn't cause transport state to stop if currently rolling (mitigating bug #3067264). - Audio clip merge processing might have been skipping a few initial frame blocks, now fixed. - Clip selection and plugin parameter hash optimization. - Anti-glitch audio clip macro fade-in/out fixed again. - New clip fade-in/out slopes (curves) are introduced, partially adapted and refactored from those easing equations of Robert Penner's fame. - Clip fade-in/out non-linear slopes are now shown as actual WYSIWYG curves. - Escape key now closes generic plugin widgets as ever found usual elsewhere. - Picking nits: unselect current track when clicking on any gray empty area, also accessible from a new menu item: Track/Navigate/None. - A nasty and deadly MIDI resolution overflow has been finally fixed, allowing for long MIDI sequences (1h+) to load correctly on 32bit machines from now on (was perfectly fine on 64bit though). - MIDI editor selection hash optimization in face of reasonably huge event sequences. - MIDI controller mapping finally refactored to support some other MIDI event types than just CC (0xBn) ones. - Nitpicking fix: corrected main track-list (left pane) display when no track is currently selected. - libX11 is now being added explicitly to the build link phase, as seen necessary on some bleeding-edge distros eg. Fedora 13, Debian 6. (fixing bug #3050944). - New audio metronome bar and beat sample gain options. - Progressively, the observer pattern is being finally introduced, targeting all potentially automation controls and widgets as plain ground-zero for the (ultra-)long overdue automation feature. - MIDI controller mapping of still non-existing tracks were being implicitly assigned to the last, highly numbered, existing track. Now fixed. - Moving from old deprecated Qt3'ish custom event post handling into regular asynchronous signal/slot strategy. - Muting/soloing tracks while playback is looping was leaving current audio clip out-of-sync whenever that same track is later un-muted on any other preceding clip. Now hopefully fixed. - MIDI Clock support makes its first appearance. - All tempo (BPM) calculations are now compliant to the MIDI conventional equivalence between beat and quarter note (1/4, crotchet) as common standard time division. - Automatic audio time-stretch option is not enabled by default anymore. - Standard warning Apply button is now only shown when dismissing dialog changes are actually valid. - Make sure non-dedicated metronome and player buses are properly reset and reopen when changing regular audio buses (hopefully fixing bug item #3021645 - Crash after changing audio bus). - Hopefully, an outrageously old bug got squashed away, which was causing random impromptu crashes, most often when importing audio clips while looping and play-head is any near the loop end point. - General standard dialog buttons layout is now in place. - Fixed main track view off-limits play-head positioning. - Main tool-bar Time and Tempo spin-boxes, may now have their colors correct, as for most non-Qt based theme engines (ie. Gnome). Green text on black background has been and still is the the intended aspect design ;) - MIDI file import and internal sequence representation has been changed to be inclusive on all bank-select (CC#0,32) and program-change events which were previously discarded while honoring MIDI track properties. Interleaved SysEx events are now also preserved on their original sequence positions instead of squashing a duplicate into the MIDI bus SysEx setup. - Attempt to include the VeSTige header by default, as for minimal VST plugin support. - JACK transport support has been slightly rewritten, in fact the sync callback is now in effect for repositioning. - The MIDI clip editor (piano roll) widget won't be flagged as a tool window anymore. - A tempo adjustment tool is making inroads from the menu, as Edit/Clip/Tempo... (factory shortcut: F7). - Audio tracks auto-monitoring is now effective on playback. - Make sure to ask whether a dirty MIDI clip should be saved, upon resizing or stretching its edges (fixes bug #3017723). - Backward and Forward transport commands are now taking additional stops on loop points. - Attempt to optimize track solo/mute redundant transactions, in special regard to MIDI track events which were being duplicated on soloing and temporarily muted on unsoloing. Cheers && Enjoy (be happy!) -- rncbc aka Rui Nuno capela rncbc(a)rncbc.org

14 years, 2 months

[ANN] MusE 1.1

by Robert Jonsson

Friends, MusE 1.1 is here! [Introduction] MusE is a combined midi and audio sequencer which tries to cover most bases for the linux computer studio. MusE is one of the oldest sequencers on the Linux audio scene and is today a very stable open source solution for everyday music making. This release adds some new features, lots of bugfixes and a bunch of usability improvements. MusE : http://muse-sequencer.org [Highlights] * Jack midi support. * Allow native VST guis for plugins * Audio and midi routing popup menus now stay open, for making rapid connections. * MusE now has two mixers, with selectable track type display. * External midi sync fixes and improvements, should be very stable * Some pianoroll improvements * Some crash fixes * Drum editor fixes * Various arranger fixes and improvements * Various improvements for plugin guis * Routing fixes * Stability fixes for plugins * Various DSSI fixes * Rec enabled track moves with selection when only one track is rec enabled * Jack midi, routing system, multichannel synth ins/outs, midi strips and trackinfo pane. * Dummy audio driver: Added global settings for sample rate and period size. * Arranger track list: Quick 'right-click' or 'ctrl-click' or 'ctrl-mouse-wheel' toggling of Track On/Off. * Allow changing timebase master * Option to split imported midi tracks into multiple parts. * Several new keyboard shortcuts for various operations, see shortcut editor * Several colour tweaks and other cosmetic changes * Various stability fixes * Countless fixes and tweaks, about a 300 lines in the Changelog, check it for a complete list of blood sweat and tears [What is MusE again?] MusE is multitrack virtual studio with support for: * Midi * jack midi * internal softsynths, including soundfont player FluidSynth and sample player Simple Drums * DSSI softsynths, including VST instruments * with a patch to DSSI, VST-chunks are handled * Drum editor * Pianoroll * Conventional arranger * midi automation * and lots more * Audio * Jack * Jack transport * LADSPA plugins * VST plugins through dssi-vst * audio automation, old sch00l * and lots more [ChangeLog] For a complete list of changes, check the ChangeLog in the package or online at the sourceforge site: http://lmuse.svn.sourceforge.net/viewvc/lmuse/trunk/muse/ChangeLog?revision… [Download] http://muse-sequencer.org/index.php/Download Keep on rocking! The MusE team

14 years, 2 months

jamin (was: Albums under a label recorded and/or mixed with Linux)

by fons＠kokkinizita.net

On Wed, Sep 29, 2010 at 06:11:36AM -0700, Patrick Shirkey wrote: > Otherwise in the interests of keeping a relatively convivial tone I would > like to thank you for spotting the flaws that you have found. Here's one more: <http://www.kokkinizita.net/linuxaudio/jamin-iir-xover.png> This the frequency response (no EQ or whatever) using the IIR crossover, set to 500 Hz and 3 kHz. Those 'qualitatively more experienced DSP engineers' don't apparently have the experience to perform even the simplest of tests. Nor do they know that the type of filter used will produce antiphase signals at the crossover frequency. (Hint: invert the mid band). Ciao, -- FA There are three of them, and Alleline.

14 years, 2 months

Migrating to Linux - need help

by Edu Camargo

Hello guys, peace and music to all of you. Here's my story: I won a laptop some months ago, and with the Windows 7's arrival I decided to try a Linux distro, more precisely Ubuntu, for its facility and also, for the Gnome's accessibility from the CD boot to the final instalation, which is an enormous advantage for us blind users, when we want to setup a computer independently. I use computer for ten years and it's good to see Linux and Apple's developers going towards facilities to everybody... I've mentioned Apple because seems that Apple's Voiceover can also be accessed even during the instalation according to an article I've read on the web. Anyway, I've tested Ubuntu 9.10 and it wasn't that good because it had some audio issues including with the Orca's usage, so I decided to wait, and soon came Ubuntu 10.04 and, for the moment, it took all the chances of Windows getting wrapped into my laptop. Besides, with a few, very few programs I can do all the things I need to do... Of course things may change in the future, but it's good to work in a system so light, secure, and it's even better to find a supportive comunity. Last saturday I decided to move my desktop computer, an Athlon X2 4000, Asus M2N-SLI, 2GB of RAM with two hard disks, to Ubuntu 10.04.1 64bits version. I really got amazed with the performance, even the Orca screen reader is more responsive with the 64bits version. I'm interested in audio production using Linux, so I need clues. I have two audio cards, the mother board's built-in and the Delta Audiophile 2496, the ladder one detected as card 0, wich according to my understanding is the default card. But I was unable to get output from the Delta, so I had to select the built-in sound card as my default output for the moment. Then, after further reading I could install jackd and Ardour for a test, and with Ardour I get all the feedback I need while playing sounds through Delta. But of course, my goall is to make the system work fully with the Delta. What should I do to build a stable audio set using Ubuntu? And of course, what are the must have programs? Since Orca is GTK-based, I'd prefer to stay far from KDE due to accessibility issues. The thing I've loved about Ardour is that I'm able to control jack without having to access the jack GUI, which is KDE. But of course, if I can adjust settings by editing configuration files it'll be better. Any tips on how to make things work decently will be very appreciated. Sorry for some obvious questions that I might have asked, and sorry for the book. Thanks in advance for all the input. Warm regards from São Paulo, Brazil. Edu Camargo.

14 years, 2 months

Re: [LAU] [MeeGo-community] [PlanetCCRMA] meegolem -- adding rpmfusion, fedora and planetccrma repositories to meego

by Niels Mayer

FYI, I joined the meego kernel list -- the missing ALSA hrtimer will be added: On Sat, Sep 25, 2010 at 12:36 PM, Arjan van de Ven <arjan(a)linux.intel.com> wrote: > On 9/25/2010 11:20 AM, Niels Mayer wrote: >> Unfortunately, in meego, snd-hrtimer doesn't exist. Only modules in snd-* are: ... > > hmm you're right > I've added it now. More interesting, all the goodies in planetccrma/rpmfusion/fedora repos will be available in Fedora 14 with a Fedora supported Meego Desktop; the time for needing hacks like http://nielsmayer.com/meego/ is limirted. Furthermore the important tools will be documented: https://fedorahosted.org/musicians-guide/ and Linux audio, whether on a desktop or netbook or tablet, will gain further visibility and support. And meego-using multimedia users will gain a realtime kernel, perhaps, by using CCRMA's directly on Fedora 14 sometime in the future... good news all around, eh? http://www.networkworld.com/community/node/66760?source=NWWNLE_nlt_linux_20… ///// ///// ///// ///// ///// Fedora 14, nicknamed "Laughlin," will be the first Red Hat supported distribution to let users choose MeeGo as their desktop. MeeGo is a Linux desktop architecture for mobile devices, netbooks, embedded Linux devices (such as In Vehicle Infotainment systems). It is based in the GNOME mobile platform but has been beefed up with additional technologies (Clutter, GUPnP and libsocialweb). Fedora 14 will include the MeeGo Netbook UX specifically for netbook users as a "user environment that sits of top of Fedora and associated MeeGo core services. The netbook user interface and user interaction model for the target devices then is on top of that. ... This expands on the existing support we've had for Moblin in Fedora 12 and 13. " ///// ///// ///// ///// ///// -- Niels http://nielsmayer.com PS: I guess it wouldn't be too early to ask -- preexisting Qt4 "desktop" apps like http://qtractor.sourceforge.net/ http://qjackctl.sourceforge.net/ http://qsynth.sourceforge.net/ end up taking some time getting used to, due to the limited screen real estate on a netbook as well as "popup" application-level windows send you to a different screen and make it difficult to use in conjunction with other application windows simultaneously. Thus three questions related to using existing Qt4 desktop apps on Meego: (1) A way on for meego to popup new non-modal application level windows, such as "Mixer" and "Connection" in qtractor -- in the same "screen" as the one that launched it. Alternately is there a way for these windows in qtractor/qsynth/qjackctl to become panels in the existing windows? (2) A way for existing application icons in qtractor to be displayed smaller, with less border/whitespace, so that they can fit more densely in a panel. Is there an appropriate way to set different kinds of application defaults /styles/skins for using such Qt4 applications on a lower resolution screen -- such as referencing display DPI? (3) A way for Qt4 application icon panels such as used in qtractor, to be rendered as dynamic "mouseover" popups, or "window-shade" style overlays, providing the functionality of the application icons, without taking up static real estate on a cramped screen?

14 years, 2 months

Video tutorial on using a vocoder in Qtractor

by Jeremy Jongepier

Hello everyone, Just uploaded a new video tutorial to YouTube: http://www.youtube.com/watch?v=yN40LFkeeaQ It's about using the Sirlab Vocoder LADSPA plugin in Qtractor. I ditched recordMyDesktop in favor of ffmpeg with jack_capture within a nested Xephyr session with a 1280x720 resolution (apparently YouTube likes this best). The quality improved drastically. Best, Jeremy

14 years, 2 months

M-Audio Delta 1010LT

by Goran Mekić

I've read about hardware monitoring, and jackd man page says my card supports it. What I would like to get is increse periods so jack has big buffer to avoid xruns, and use hwmon to avoid latency problems. Is this possible and if yes, how? Do I just change "H/W2" input to "H/W In 0" (and similar for "H/W3")? If so, how would I hear "PCM Out" (in this case, jackd, I think)? Hardware mixer before going to the amp? Thanx! -- FreeB(eer)S(ex)D(rugs) are the real daemons

14 years, 2 months

Re: [LAU] jamin (was: Albums under a label recorded and/or mixed with Linux)

by Nick Dokos

Patrick Shirkey <pshirkey(a)boosthardware.com> wrote: > > On Wed, September 29, 2010 4:17 pm, fons(a)kokkinizita.net wrote: > > On Wed, Sep 29, 2010 at 12:19:09PM -0500, Jan Depner wrote: > > > >> Damn, I just noticed that you said IIR crossover - Steve recommended > >> against using the IIR crossover for serious work. In fact, it says that > >> in the tooltip in Edit->Preferences. I think he knew it wasn't optimal > >> when he threw it together. If you know how to fix that it would be > >> great. > > > > If you fix the filters then the IIR crossover would actually be the > > better one. The FFT-based filters are much too steep (this can be > > fixed as well of course). > > > > We are looking into all of your concerns. > > FYI, by three experienced people I was referring to Steve Harris, Jack > O'Quin and my friend who is assisting with analysis of your diagnosis of > the problems/bugs inherent in the current design. As we are all busy and > you seem to have spent a fair amount of time analysis the issues it will > take a us a couple of days to run a full set of tests. We are happy to > isolate the issues you have presented as priority concerns. > > Perhaps an easier way to do this in the future is to just present your > evidence up front instead of trashing other peoples hard work with vague > off hand and out of context remarks. > > It doesn't contribute to your credibility in the slightest. If anything it > just makes you come across as an arrogant bitch. I'm sure that is not the > public face you want to present to the world and neither is it the status > that we want to confer on you either. > > Just my 2 x 1/8oz gold coins though. > You should have kept them in your pocket and kept your mouth (keyboard?) shut. Next time, when you are boiling, go take a shower, relax, get a good night's sleep and then think of a more constructive way to go forward. Can all of the people concerned just take a step back please? Thanks, Nick P.S. If you are wondering "who the hell is he?", the answer is "nobody": I've posted once or twice over the past year, but I've been mostly lurking, trying to learn a few things. I don't know much about the technical matters but I can see a disaster coming as well as anybody. All I'm trying to do is avert it, but I can't do more than point out it's here. It's up to you (all of you) to steer the discussion into more productive channels.

14 years, 2 months

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Linux-audio-user September 2010