Linux-audio-user February 2010

linux-audio-user@lists.linuxaudio.org

169 participants
129 discussions

[LAU] Pure Data Workshop 2: Interfacing with the world (Dorkbot Portland Oregon)

by Alex Norman

Pure Data Workshop 2: Interfacing with the world * what: DorkbotPDX PD (Pure Data workshop); * who: you and your friends; * where: PNCA room 205, 1241 NW Johnson St., Portland, OR 97209; * when: February 21st 1-5pm * cost: $35 hardware fee - this gets you a Midi Monster - a dorkbot/Don Davis designed AVR microcontroller based sensor to USB+midi interface.* Details: This is the second workshop in our Pure Data series. Pd is used by artists, sound designers, DJs, VJs and a variety of audio hackers. It is free, libre, and open source software that runs on Linux, Mac, and Windows. We will be focusing on interfacing PD physical world. You will use knobs, buttons, and lewd gestures to control patches within Pd. Similarly we will teach you how to reverse this process and use your Pd patch to control the entire world. We will interface with MIDI devices, off the shelf USB devices, other computers and custom hardware/sensors using the Midi Monster designed by Don D. Davis. This workshop assumes basic pd knowledge - but if you missed our first pd workshop or otherwise need to learn the basics - prior to signing up we recommend checking out the first two chapters of this tutorial: http://www.pd-tutorial.com/ To Sign up: 1. Go to this page: http://www.tempusdictum.com/tdproducts.html 2. Scroll down to Workshops, and select the "Interfacing Hardware to PD" "product". 3. Click "Add To Cart" and follow the instructions there. * This will secure your place in the workshop and reserve you a "Midi Monster," the sensor -> MIDI unit we will be using for the workshop. Bring to the workshop: 1. A laptop with pd-extended installed: http://puredata.info/downloads 2. A pair of headphones. 3. A standard type A to type B USB cable. 4. A thirst for danger. 5. optional: * A MIDI synthesizer or drummachine. * A MIDI controller interface [knobs/buttons/etc]. * A USB HID device [gamepad, rockband controller, etc]. For this info and curriculum details: http://dorkbotpdx.org/workshop/pd/2-interfacing_with_the_world *no microcontroller programming required for this particular workshop.

16 years

[LAU] openoctave demo music?

by rosea grammostola

Hi, Is there also demo music available made by the openoctave project? I'm interested in some music (by Alex) made with the openoctave tools. It would also be good for people who use proprietary software to hear what is really possible. Thanks in advance, \r

16 years

[LAU] sending random midi notes from a bash script

by james morris

I want to send a random midi note each time a bash script is called... Not for anything useful, just experimenting... I guess the tool would best be connecting to a midi-through port rather than hard-coding a particular synth? The tool would just be required to send a single midi note to some port. The note to be sent should be specifiable on command line, along with length/velocity ... probably would be enough. Any ideas? TIA, James.

16 years

[LAU] Retrieving audio info from a video file

by Jonathan Gazeley

Hi all, This is slightly OT for the group, but I hope someone can tell me. I have thousands of large AVI files and I want a quick way to determine from the command line whether their audio is stereo, 5.1, etc. I've read about ffmpeg and haven't seen anything jumping out at me, and it's hard to pick the right search keywords to find relevant pages on Google. Anyone know a trick to get this info? Currently I can do it by right-clicking on the file and viewing its properties, but there *has* to be a better way... Cheers, Jonathan ---------------------------- Jonathan Gazeley Systems Support Specialist ResNet | Wireless& VPN Team Information Services University of Bristol ----------------------------

16 years

[LAU] X Window Midi Arp Toy

by james morris

Sorry for the verbiage, but I think it needs some explaining... The X Window Midi Arp Toy is a BASH script to be run from an X terminal. It sends midi data to a midi device and acts as a kind of arpeggiator. The script opens an X terminal, the placement of which directly dictates the pitch and loudness of the midi note data sent to the device. Each X terminal that is opened calls the script again, to continue the process which results in a semi-random arpeggiated sequence and terminals of varying colours opening up all over your screen (before disappearing again, one by one). I personally find it quite entertaining. (and yes, you can stop it - press ctrl-c several times) Several factors influence this script: The window manager being the most important here. As an example I will describe the behaviour of the two window managers I have tested this script under: The Fluxbox window manager places terminals where they will fit and always tries placing them from the top left of the screen, moving right and then down if it cannot place a window without overlapping another. This kind of behaviour is the kind which creates arpeggiated results. Patterns can be created by blocking off areas of the screen with the windows of other programs. These patterns can then be modified by moving the windows. And if you have virtual work-spaces/desktops you can arrange several patterns and switch between them. The EvilWM window manager on the other hand, always places the windows directly under the mouse pointer (or whatever pointing device you use). This type of behaviour is better for... un-patterned sequences. The patterns you create with this kind of behaviour are the patterns you make with the mouse pointer. The Script's System Settings (important!) ------------------------------------------ There is only one option in the system settings section of the script: the midi device to use to send midi data to. /dev/snd/midiC1D0 is used by default. If you're lucky this device exists on your system, otherwise you'll have to know which device to set mididev to. On my system, in qjackctl, I connect virtual raw midi 1 to my favourite softsynth and them I'm off! *** OTHER IMPORTANT CONSIDERATIONS *** -------------------------------------- Don't expect this script to run well under a window manager with all the bells and whistles. There's a reason I mention Fluxbox and EvilWM - they're light and don't do anything fancy, and so respond quickly. I recommend running this script from within xterm. Again, xterm is lightweight and very responsive compared to something like Gnome Terminal. USE XTERM! THIS SCRIPT REQUIRES THE xwininfo PROGRAM, IT WON'T WORK WITHOUT IT. The Script's User Options ------------------------- At the top of the script there is a section named "user options" here you can specify the lowest note and the highest note, the lowest velocity, and the highest velocity. A pattern can also be specified in the form of 1's and 0's. A 1 means a note will be played, a 0 means it won't. Because of the nature of this script, note durations and pauses are specified in seconds. BASH is not really cut out for real-time low-latency precision timing (I assume). The notetime setting is how long the note should last. The hangtime setting is how long the terminal window should hang around for after the note turns off. The hangtime setting does actually influence the pattern, if your window manager prefers not to overlap windows. The last settings in the "user options" section are the minimum and maximum dimensions of the terminal windows that will be opened by the script. These are also only influential if your window manager prefers not to overlap windows. ---------------- DOWNLOAD http://jwm-art.net/art/text/xwinmidiarptoy chmod +x Downloads/xwinmidiarptoy Downloads/xwinmidiarptoy MAKE SURE YOU HAVE xwininfo INSTALLED! enjoy! I make no guarantees this will work on your system. --- this text: http://jwm-art.net/art/text/xwinmidiarptoy.txt

16 years

[LAU] server issues

by Ivica Ico Bukvic

All, We are continuing to encounter issues with our server and will have to take the system offline for a couple of hours until we figure out what is exactly going on. We'll keep you posted as soon as we know more. Best wishes, Ivica Ico Bukvic, D.M.A. Composition, Music Technology Director, DISIS Interactive Sound & Intermedia Studio Director, L2Ork Linux Laptop Orchestra Assistant Co-Director, CCTAD CHCI, CS, and Art (by courtesy) Virginia Tech Dept. of Music - 0240 Blacksburg, VA 24061 (540) 231-6139 (540) 231-5034 (fax) ico(a)vt.edu http://www.music.vt.edu/faculty/bukvic/

16 years

[LAU] n00b help with MUSE, and another thing

by J. Simon van der Walt

I'm trying to get going with MUSE, watching this video http://www.youtube.com/watch?v=11VWsbeT35s#t=1m44s At the point linked to, the contextual menu shows 'Add Synth', but I don't seem to have that option; various other types of track I can add, but not that. Any ideas? Second, probably stupidly basic and annoying question; as soon as I launch Jack, I lose all sound from the YouTube video I'm trying to watch in Firefox. How does one get around that? tia -- J. Simon van der Walt - Composer www.jsimonvanderwalt.com +44 (0) 7905 270 198

16 years

[LAU] [ANN] Minicomputer 1.4

by Malte Steiner

just released the version 1.4 of the softwaresynthesizer Minicomputer for Linux. Its mainly a bugfix release: - fix: names of patches and multis were displayed wrong, only the last letters which are usually blanks - fix: change so that it can be now compiled without being in C99 mode - new: using alsaseq eventfilter to receive only events that are processed more at http://minicomputer.sourceforge.net/ -- ---- media art + development http://www.block4.com follow me on Twitter: http://twitter.com/herrsteiner or face the book: http://www.facebook.com/herrsteiner

16 years

[LAU] supernova v0.2

by Tim Blechmann

hi all, there is a new release of supernova, a multi-processor aware version of the supercollider server scsynth. it provides most features of scsynth, the most prominent feature, that is still missing, is non-realtime synthesis. that will be part of v0.3, though ... getting started: http://tim.klingt.org/code/wiki/supernova tarballs: http://tim.klingt.org/code/projects/list_files/supernova git repository: git://tim.klingt.org/supercollider.git debs: https://launchpad.net/~tim-klingt/+archive/supernova cheers, tim -- tim(a)klingt.org http://tim.klingt.org Happiness is a byproduct of function, purpose, and conflict; those who seek happiness for itself seek victory without war. William S. Burroughs

16 years

Re: [LAU] Retrieving audio info from a video file

by Jonathan Gazeley

On 02/09/2010 11:26 AM, Maarten de Boer wrote: >> Thanks for your advice. Unfortunately this seems to require a graphical >> machine, but I'm trying to run this on a headless fileserver that has >> all my media. >> >> [jonathan@zeus ~]$ mplayer -frame 0 -identify movie.avi >> Creating config file: /home/jonathan/.mplayer/config >> Unknown option on the command line: -frame >> Error parsing option on the command line: -frame >> MPlayer SVN-r29701-4.4.1 (C) 2000-2009 MPlayer Team >> >> Any other ideas? > > The option is -frames, not -frame, and you can use the null output > devices to run this on a headless machine. > > mplayer -identify -frames 0 -vo null -ao null movie.avi > > maarten > > Thanks Maarten. I also found an app in the Fedora repo called themonospot which does what I want. Cheers, Jonathan

16 years

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Linux-audio-user February 2010