Linux-audio-user January 2013

linux-audio-user@lists.linuxaudio.org

140 participants
130 discussions

[LAU] Fwd: IEEE AASP Challenge on Detection and Classification of Acoustic Scenes and Events - deadline 31st March

by Dan S

Dear all, We invite researchers in signal processing, machine learning and other fields to participate in our challenge - the IEEE AASP Challenge on Detection and Classification of Acoustic Scenes and Events. Now available: * Public datasets (CC-licensed, audio and annotations) for scene classification and event detection * Task specifications for our first two tasks, scene classification and event detection (office live) * A Linux virtual machine, which you may use to test your code * Templates for challenge extended abstracts The deadline for submissions is 31st March. Results will be presented/discussed in a special session at WASPAA 2013. Full details: <http://www.elec.qmul.ac.uk/digitalmusic/sceneseventschallenge/> Please feel free to ask us questions directly or via the challenge mailing list <http://www.eecs.qmul.ac.uk/mailman/listinfo/aasp-challenge>. Best wishes, The organisers -- Dimitrios Giannoulis (QMUL), Emmanouil Benetos (CityU/QMUL), Dan Stowell (QMUL), Mathias Rossignol (IRCAM), Mathieu Lagrange (IRCAM) and Mark D. Plumbley (QMUL)

13 years, 1 month

[LAU] Blacklisting a pulse audio device

by Bob van der Poel

Does anyone know if it's possible to tell pulse to NOT load a particular device? It'd be nice to blacklist my usb audio and just start that with jack when it's needed. And to have the pulse stuff continue to run to play music, etc. -- **** Listen to my CD at http://www.mellowood.ca/music/cedars **** Bob van der Poel ** Wynndel, British Columbia, CANADA ** EMAIL: bob(a)mellowood.ca WWW: http://www.mellowood.ca

13 years, 1 month

Re: [LAU] Audio Interface for live Processing

by Saul Rayson

Hi all, Apologies if these questions have been asked before I can't find a definitive answer. I need an audio interface to work with my thinkpad X60 running Ubuntu studio for live processing. At least 2 in 2 out. My main program is SuperCollider and the main issue I for see is latency. With the internal sound card the latency 11.6 ms, which of course is very noticeable. Would usb 2 be adequate for this or should I go firwire? I've tried Motu ultra light, which I know is not supported, so was not surprised when it did not work (but I have heard of some people getting it to work). I've also tried Focurite Saffire 6 USB with no success, I've read there are issues but I'm not convinced USB 1 would be up for the job. I've also read that in order to use a firewire interface you need a real-time Kernel, where Ubuntu studio has a low latency Kernel? I am fairy new to the world of Linux and moving from Mac. Any audio interface recommendations and advice greatly appreciated. Cheers, Saul

13 years, 1 month

[LAU] [Survey] Audio distro

by Pablo Gómez Poch

I just want to know what distros are you using in 2013, it would be helpful for programmers and help newbies to choose. So I created a poll: http://www.surveymonkey.com/s/ZX8DL79

13 years, 1 month

[LAU] I really need help with jack

by Bob van der Poel

I've decided that the only way I'm going to get my system to record anything decent is to use jackd. But, I'm being a total idiot with this ... First off, I have the the following devices: bob$ aplay -l **** List of PLAYBACK Hardware Devices **** card 0: SB [HDA ATI SB], device 0: ALC883 Analog [ALC883 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: SB [HDA ATI SB], device 1: ALC883 Digital [ALC883 Digital] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: CODEC [USB Audio CODEC], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0 The 2nd one is a spdif speaker attached to the mother board. For now, lets try to get jack working with this. pasuspender -- jackd -d alsa "ALC883 Digital" (BTW, I tried hw0,1 and some other combinations ... but they are the same results) After the command I get: bob$ pasuspender -- jackd -d alsa "ALC883 Digital" jackd 0.121.2 Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn and others. jackd 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 compiled with System V SHM support. cannot lock down memory for jackd (Cannot allocate memory) loading driver .. creating alsa driver ... hw:0|hw:0|1024|2|48000|0|0|nomon|swmeter|-|32bit control device hw:0 configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods ALSA: final selected sample format for capture: 32bit integer little-endian ALSA: use 2 periods for capture ALSA: final selected sample format for playback: 32bit integer little-endian ALSA: use 2 periods for playback JACK: unable to mlock() port buffers: Cannot allocate memory JACK: unable to mlock() port buffers: Cannot allocate memory **** alsa_pcm: xrun of at least 0.033 msecs Which seems to be okay? Now, I run audacity. Got jack as an output option and load a file. Play it ... the VU meter shows, but no audio. NADA. Just silence. If I can't get a simple play to work, I fear becoming a recording star is out of my reach! Please, this shouldn't be that hard??? -- **** Listen to my CD at http://www.mellowood.ca/music/cedars **** Bob van der Poel ** Wynndel, British Columbia, CANADA ** EMAIL: bob(a)mellowood.ca WWW: http://www.mellowood.ca

13 years, 1 month

Re: [LAU] I really needed help with JACK

by Ralf Mardorf

-------- Forwarded Message -------- From: Ralf Mardorf <ralf.mardorf(a)rocketmail.com> To: linux-audio-user(a)lists.linuxaudio.org Subject: Re: [LAU] I really needed help with JACK Date: Mon, 28 Jan 2013 02:45:58 +0100 On Sun, 2013-01-27 at 17:45 -0700, Bob van der Poel wrote: > Funny, can't get it to work with qtjackctl ... another > project :) You can run Jack from CLI and than start Qjackctl, if you want to use it.

13 years, 1 month

Re: [LAU] pasuspender

by Ralf Mardorf

-------- Forwarded Message -------- From: Ralf Mardorf <ralf.mardorf(a)rocketmail.com> To: linux-audio-user(a)lists.linuxaudio.org Subject: Re: [LAU] pasuspender Date: Mon, 28 Jan 2013 02:46:53 +0100 On Sun, 2013-01-27 at 17:48 -0700, Bob van der Poel wrote: > I've mentioned my problems (no doubt with way too much drama) on a > different thread about getting jackd to work on my system. Seems to be > fine now using pasuspender to launch jackd. > > Only problem I'm having is that after I stop jack I need to restart > pulse. And, then the volume control for pulse doesn't work properly. > Short story is that after using pasuspender I need to log out/in. > > Any suggestion appreciated. Do you need PA for something?

13 years, 1 month

[LAU] pasuspender

by Bob van der Poel

I've mentioned my problems (no doubt with way too much drama) on a different thread about getting jackd to work on my system. Seems to be fine now using pasuspender to launch jackd. Only problem I'm having is that after I stop jack I need to restart pulse. And, then the volume control for pulse doesn't work properly. Short story is that after using pasuspender I need to log out/in. Any suggestion appreciated. -- **** Listen to my CD at http://www.mellowood.ca/music/cedars **** Bob van der Poel ** Wynndel, British Columbia, CANADA ** EMAIL: bob(a)mellowood.ca WWW: http://www.mellowood.ca

13 years, 1 month

[LAU] I really needed help with JACK

by Alf Haakon Lund

This is kind of OT, but Bob's problems with jack inspired me to share my experience: I recently bought a Toshiba Sattelite p 850 and installed Ubuntu Studio 12.10. It's slick and mostly just minor tweaks needed to take care of my office needs. Then onto musical needs; connect Roland Edirol UA-25EX and start Ardour, which exits unable to start jack. Run qjackctl, try different settings. Finally getting it to run and able to start Ardour I completely fail to record anything. More fiddling with settings. Jack hangs on exit. Ardour crashes. There is no sound from gmusicbrowser or internet either. Hair is pulled out. Starting over. And everything seems to work, I say "testing, testing" to my mike and hit a few keys on my synth, meters showing input - but it turns out what is actually working is the internal mike. No recording through USB... I search forums and pull out more hair, to no avail. I randomly change settings, and suddenly! So here's my recipe to have it all work _out of the box_: 1. connect UA-25EX 2. power up Ubuntu Studio 3. Start jack. Settings: Realtime box: checked Priority: DEFAULT Frames/period: 128 (higher number, more latency. With this I have 8ms) Sample Rate: 48000 (same as USB interface UA-25EX) Periods/buffer: 3 Dither: None Audio: Duplex Interface: hw:1 (this will possibly be different on another machine) Input device: default Output device: default Channels I/O: default Latency I/O: default 4. Open sound settings. Disable built-in-audio and set jack sink as fallback 5. Run Ardour and record whatever from wherever! All playback going through USB interface. So in the end it was quite simple and working out of the box, it was just bloody unintuitive to figure out. And mind you, I still get in trouble if I run sound through pulse before starting jack. But all in all I like my Ubuntu Studio better and better! Hope this will be helpful for someone. Alf

13 years, 1 month

[LAU] Infrasonic Quartet mixing: how to use both stero inputs?

by Vladimir Snigur

Hi all! Seems like Quartet (ice1724 driver) has two stereo inputs, but my software sees only one from each pair so that I have too choose in alsamixer which input to use (PCM 1/2 or 3/4). I want though to use both of them. How can I do that? I'd like to mix two audio streams using Jack.

13 years, 1 month

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Linux-audio-user January 2013