Linux-audio-user September 2013

linux-audio-user@lists.linuxaudio.org

99 participants
90 discussions

by Russell Hanaghan

Still alive obviously and still using Linux audio exclusively for all studio stuff. And because I just should, I'll make sure the GF has my correct email for personal biz! lol could be relevant... I have recorded her singing some way cool stuff on Linux too! Currently, Mixbus AND Ardour 3 atop KxStudio an AV Linux! My what a way we've come! ~ Russell

12 years, 2 months

Re: [LAU] options for hard real time kernel for raring 13.04

by Marco Donnarumma

[sorry, resending this to the list cuz I had forgot the subject] ~~~~~ Thanks Ralf, helpful info. But no luck yet. see below. > - the nvidia module seems not to be loaded. I guess it's not because I > > don't see the flash screen NVidia at booting > > Don't guess, take a look at /var/log/Xorg.0.log. When doing this, first > grep EE, IOW run > > grep EE /var/log/Xorg.0.log > Failed to load module :) grep EE /var/log/Xorg.0.log [ 28.292] Current Operating System: Linux blackrottenchest 3.2.48-rt69 #1 SMP PREEMPT RT Wed Sep 11 15:34:00 CEST 2013 i686 (WW) warning, (EE) error, (NI) not implemented, (??) unknown. [ 28.296] Initializing built-in extension MIT-SCREEN-SAVER [ 30.244] (EE) NVIDIA: Failed to load the NVIDIA kernel module. Please check your [ 30.244] (EE) NVIDIA: system's kernel log for additional error messages. [ 30.244] (EE) Failed to load module "nvidia" (module-specific error, 0) [ 30.252] (EE) NVIDIA: Failed to load the NVIDIA kernel module. Please check your [ 30.252] (EE) NVIDIA: system's kernel log for additional error messages. [ 30.253] (EE) Failed to load module "nvidia" (module-specific error, 0) [ 30.310] (EE) [drm] KMS not enabled [ 30.310] (EE) open /dev/dri/card0: No such file or directory [ 30.334] (EE) open /dev/fb0: No such file or directory [ 31.077] (EE) Failed to initialize GLX extension (Compatible NVIDIA X driver not found) [ 31.149] (II) XKB: reuse xkmfile /var/lib/xkb/server-3781FECB9CB8D26EE03343DB2C93394EA704B98F.xkm > > Shall I have run the installer when running the rt-kernel? and if so, > > why is that, are modules kernel-dependent? > > Modules have to fit to the kernel. You should run the NVIDIA *run thingy > manually. > > I've got no time to search for you an English howto, sorry, on the quick > I only found a German howto: > http://wiki.ubuntuusers.de/Grafikkarten/Nvidia/Manuelle_Treiberinstallation > ok. that clarifies it, thank you. Anyway, I tried the module building only, and failed again. to be extra-safe, this time I booted the rt kernel and did: sudo ./nvidia-installer -a -K --kernel-name=$(uname -r) >From the nvidia log I can see the module being successfully built, but not installed because: ERROR: A DKMS kernel module with version 310.44 is already installed. ERROR: Installation has failed. So, something is still wrong. It would seem my previous installation had installed a module in the rt kernel, but that module doesn't work with rt kernel 3.2.xx? thanks, cheers, -- Marco Donnarumma New Media + Sonic Arts Practitioner, Performer, Teacher, Director. Embodied Audio-Visual Interaction Research Team. Department of Computing, Goldsmiths University of London ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Portfolio: http://marcodonnarumma.com Research: http://res.marcodonnarumma.com Director: http://www.liveperformersmeeting.net

12 years, 2 months

(no subject)

by Marco Donnarumma

Thanks Ralf, helpful info. But no luck yet. see below. > - the nvidia module seems not to be loaded. I guess it's not because I > > don't see the flash screen NVidia at booting > > Don't guess, take a look at /var/log/Xorg.0.log. When doing this, first > grep EE, IOW run > > grep EE /var/log/Xorg.0.log > Failed to load module :) grep EE /var/log/Xorg.0.log [ 28.292] Current Operating System: Linux blackrottenchest 3.2.48-rt69 #1 SMP PREEMPT RT Wed Sep 11 15:34:00 CEST 2013 i686 (WW) warning, (EE) error, (NI) not implemented, (??) unknown. [ 28.296] Initializing built-in extension MIT-SCREEN-SAVER [ 30.244] (EE) NVIDIA: Failed to load the NVIDIA kernel module. Please check your [ 30.244] (EE) NVIDIA: system's kernel log for additional error messages. [ 30.244] (EE) Failed to load module "nvidia" (module-specific error, 0) [ 30.252] (EE) NVIDIA: Failed to load the NVIDIA kernel module. Please check your [ 30.252] (EE) NVIDIA: system's kernel log for additional error messages. [ 30.253] (EE) Failed to load module "nvidia" (module-specific error, 0) [ 30.310] (EE) [drm] KMS not enabled [ 30.310] (EE) open /dev/dri/card0: No such file or directory [ 30.334] (EE) open /dev/fb0: No such file or directory [ 31.077] (EE) Failed to initialize GLX extension (Compatible NVIDIA X driver not found) [ 31.149] (II) XKB: reuse xkmfile /var/lib/xkb/server-3781FECB9CB8D26EE03343DB2C93394EA704B98F.xkm > > Shall I have run the installer when running the rt-kernel? and if so, > > why is that, are modules kernel-dependent? > > Modules have to fit to the kernel. You should run the NVIDIA *run thingy > manually. > > I've got no time to search for you an English howto, sorry, on the quick > I only found a German howto: > http://wiki.ubuntuusers.de/Grafikkarten/Nvidia/Manuelle_Treiberinstallation > ok. that clarifies it, thank you. Anyway, I tried the module building only, and failed again. to be extra-safe, this time I booted the rt kernel and did: sudo ./nvidia-installer -a -K --kernel-name=$(uname -r) >From the nvidia log I can see the module being successfully built, but not installed because: ERROR: A DKMS kernel module with version 310.44 is already installed. ERROR: Installation has failed. So, something is still wrong. It would seem my previous installation had installed a module in the rt kernel, but that module doesn't work with rt kernel 3.2.xx? thanks, cheers, -- Marco Donnarumma New Media + Sonic Arts Practitioner, Performer, Teacher, Director. Embodied Audio-Visual Interaction Research Team. Department of Computing, Goldsmiths University of London ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Portfolio: http://marcodonnarumma.com Research: http://res.marcodonnarumma.com Director: http://www.liveperformersmeeting.net

12 years, 2 months

comparing audio recordings on the command-line?

by Eric Wong

Hi, I'd like to compare recording quality of portable recorders. I only care about the line-in input of these portable recorders. I'm thinking: * play audio through a good DAC and feed the line-in of each recorder * copy audio files off the SD cards from the recorders * level match the inputs. Probably based on "sox FILE -n stats" output change input levels on each recorder to match levels. * play audio again through the DAC and feed the line-ins * copy audio files off the SD cards from the recorders again * run something like diff(1) for audio I'm willing to look at a spectrogram/graph image with feh(1), but I _really_ don't want to touch a mouse or tab through form buttons/boxes/inputs on a GUI. Thanks for reading.

12 years, 2 months

Update of zita-ajbridge

by Fons Adriaensen

Hello all, zita-ajbridge-0.4.0 is now available at the usual place: <http://kokkinizita.linuxaudio.org/linuxaudio/downloads/index.html> >From the README: * The 'JackPortIsTerminal' and 'JackPortIsPhysical' flags are set on the Jack ports. * The correct latency value is set on the Jack ports. This is the latency resulting from buffering and resampling. It does not include any additional latency due to processing by the sound card, e.g. from anti-alias filters. This can be added using the -I (for a2j) and -O (for j2a) options, in the same way as for Jack's ALSA backend. The README also explains how to test this. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow)

12 years, 2 months

Slides from my Ohio Linux Fest 2013 presentation

by Neil

I'm just home from this year's Ohio Linux Fest. I spoke on under-recognized musical uses for computers. The blog post linked below includes my slides. http://oldmixtapes.blogspot.com/2013/09/thank-you-to-everybody-who-attended… Neil -- DJ Dual Core's Blog http://oldmixtapes.blogspot.com/ Order without government; Peace without violence.

12 years, 2 months

Why would volume fluctuate while recording?

by Rusty Perez

I know this would be like finding a needle in a heystack, but, here goes. I just recorded an audio track in to ecasound via nama. Here's the input chain. Wide diafram condensor mic > Art Tube pack with compressor bipassed > line 3 of Delta 1010LT > DAW. There was no processing on the input chanel of the daw. But, while I was recording an energetic vocal/guitar track, the level of monitoring output on the mic only dropped about 15-20 db in my monitoring headphones. The click stayed at normal volume. Any thoughts at all? It's pretty hot here in the studio, could the heat be effecting things at all? CRAZY and mistifyed. Rusty

12 years, 2 months

Re: [LAU] options for hard real time kernel for raring 13.04

by Marco Donnarumma

> Hi Marco, > > I recompiled a real time kernel for 13.04 following the system > configuration guide (in this case the italian translation that reports > "3.2.35-rt52"). > > http://linuxaudio.it/index.php/Configurazione_di_sistemi_audio_GNU/Linux#Co… > > I'm using an hp pavilion 6 laptop with the ua-25 ex soundcard and with > this particular real time Kernel everything works fine. > 1 xrun discovered at 5,8 ms latency in 3 hours session, recording and > mixing with Ardour. > > Best regards > Nicola > > > Hi Nicola, thanks for sharing your experience. The process in that tutorial is very similar to the one I followed from the other tutorial in English. It's good to know it works well, yet my problem is with the nvidia driver that needs to be patched for -rt as well. thank you! best, M

12 years, 2 months

The World Will Note

by Lorenzo Sutton

Dear LAU, I would like to share a work which was complete about 1 year ago which for various reasons is online only today: a video story (short film) by director Matteo Scerfò [1] for which I created the sound My part was done 100% in Linux. Links (see below for a brief explanation and linux-audio tech. details). Vimeo: http://vimeo.com/74006880 Direct link to ogv: https://copy.com/BlSzDxEA9kp4/the_world_will_note.ogv Audio only ogg: http://www.lorenzosu.net/video/the_world_will_note/wwn_audio_only.ogg I created the complete sound(track) as the final work for my electronic music diploma dissertation last year. As you can hear, this is not your tipical soundtrack :-). The film was initially conceived as silent, so my task was to give it sound at all levels. A more detailed explanation is provided in the accompanying paper [2] which I'm afraid is in Italian only, however I'll be happy to provide details if anyone is curious. All audio was created on Linux using FLOSS software. All audio was also generated, i.e. there is no sampled sound - with the exception of TTS which strictly speaking _does_ use samples. Audio software used. - JACK - Ardour (version 2 - with various LADSPA effects..) - Xjadeo (jack-transpor aware video player) - Pure Data (including Granita glanular synth) - Festival (speech synthesis - with some MBROLA voices) - Rosegarden - hexter DSSI - yoshimi Ardour + Xjadeo was my montage workbench. Pure Data was used to generate all sound ecept or TTS done through Festival. I owe much inspiration to Andy Farnell and his book Designing Sound [3] for the concepts, ideas and the philosophy of generating sound. Rosegarden was used to compose and sequence the 'musical' parts. Excluding TTS where wave files were generated and then imported into Ardour all the rest was directly fed and recorded into the DAW through JACK. Ciao, Lorenzo. [1] http://www.cinemaitaliano.info/pers/022008/matteo-scarfo.html [2] http://www.lorenzosu.net/video/the_world_will_note/twwn_documento.pdf [3] http://mitpress.mit.edu/books/designing-sound

12 years, 2 months

M/S EQ in Linux

by Brent Busby

I've been looking for a way to try mid/side EQ in Linux. The documentation for the Calf plugins implies they can (http://calf.sourceforge.net/plugins.html#filter), but never says how. Also, I don't see anything in the GUI that would allow you to toggle mid versus side versus whole mix. Are mid/side EQ tricks possible with the Calf plugins, or any other way on Linux? -- + Brent A. Busby + "We've all heard that a million monkeys + Sr. UNIX Systems Admin + banging on a million typewriters will + University of Chicago + eventually reproduce the entire works of + James Franck Institute + Shakespeare. Now, thanks to the Internet, + Materials Research Ctr + we know this is not true." -Robert Wilensky

12 years, 2 months

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Linux-audio-user September 2013