Linux-audio-user October 2012

linux-audio-user@lists.linuxaudio.org

109 participants
97 discussions

by S. Massy

Hey, list, I'll just say this one last time in a separate thread and close the topic once and for all, because it makes me feel like a complaining old man. I know many of you use soundcloud to share and distribute your material, and I certainly can understand why, since SC seems to offer a very convenient platform to do so and facilitate exposure and feedback from others. No trouble there; maybe I'll jump on board the soundcloud train if and when I ever have any audio worth sharing. Now, as you all know, soundcloud uses a flash-based player and does not seem to allow direct download by default. As a result, should I wish to sample material posted on soundcloud I need to 1) fire up GNOME, 2) fire up Orca, 3) fire up iceweasel, 4) memorise and copy the URL, 5) plug some headphones in my computer's on-board sound interface, because audio doesn't play through my main JACK setup, 6) wrestle with the partially accessible SC flash player. This is my personal experience, but I know from previous threads that other users on this list face at least some of the same issues. I therefore think many on this list would be more likely to comment on shared material if direct links were provided or if, at least, direct download were enabled on soundcloud. Most of you have amazing material to share: please don't lock yourselves into a platform! All right, I rest my case. Happy Halloween to all! Cheers, S.M.

13 years

Endlessly-stuttttttttttttttttering ALSA audio

by Ken Restivo

Over the summer, I set up a Linux server running Airtime for a small micropower radio station in a remote area. All went well, except now I'm getting reports that the audio is stuttering endlessly on one 40ms frame of audio, like a CD skipping. The only way to get it to stop is to restart the liquidsoap playout engine (or to power-cycle the server, which is what they are doing now whenever it chokes). This seems totally wrong to me, but that's how it is. I've heard audio stutter briefly on machines, usually under heavy CPU load, but what could be causing it to stutter endlessly (until the application quits), on one frame with low/no load? What could be done to stop it from doing that? For reference, this is a 3Ghz P4, running airtime 2.1.2 which uses liquidsoap 1.0.0-svn, with Ubuntu 10.04 and kernel 2.6.32-38-generic-pae, hyperthreading on, 2GB RAM, 1.0.22.1+dfsg-0ubuntu3, and the liquidsoap instance runs typically 3-10% of CPU. I've looked in the logs at the time the error occurs, and.... nothing. Nothing at all out of the ordinary in the (noisy) airtime logs or the system logs. Because it's a remote server and I'm not on-site, I'm not interested in superstition: "try this, maybe it'll help, try upgrading to the latest version of x, y, z, try random-endless-variations". That-- and shrugs-- is all I've gotten from Airtime and Liquidsoap. I'd like to know exactly HOW this problem is occurring and what can be done to fix it permanently. I figured if anyone might have some clues where I could look to find this out, and what mechanism could possibly cause a single frame of audio to stutter endlessy, I might find some here. Thanks. -ken

13 years

sample license

by Thijs van severen

Hi all some time ago i sampled a vintage rhythmbox (the Denon CRB 90) and created a hydrogen drumkit with these samples being the good civilian i am i decided to try and contact Denon and politely ask them if i could use these samples (and if possible release the drumkit under some sort of CC license) the answer i got was this : uhu : nada, nothing, null, etc ... so i figured if they dont allow me to use the samples ... why dont you guys ;-P no seriously, does anyone know if i can use the samples -without going to jail and all- the box is really old (see http://crb90.files.wordpress.com/2010/08/rhythmbox-crb-90-japan-advert.jpg) so i was wondering if there is a limitation on the time that samples are 'protected' by a license any ideas ? thanx guys! grtz Thijs -- follow me on my Audio & Linux blog <http://audio-and-linux.blogspot.com/> !

13 years

debian wheezy vs pulseaudio vs jackdbus

by Patrick Shirkey

Hi, Does anyone know whats going on with pulseaudio-module-jackdbus in Debian Wheezy? On my system the jackdbus module doesn't exist in the repos and the result is that pulseaudio doesn't play nice with jack. I can see that jackd2 was compiled with dbus support so not sure what's going on with the missing pulse module. -- Patrick Shirkey Boost Hardware Ltd

13 years

M-Audio fast track pro mic input fails with smaller buffer size

by James Harkins

Has anyone else had this problem? For some pieces using live mic input, I wanted to reduce latency by pulling the Jack IO buffer size down to 512 samples from the default 1024. (I also tried 256 samples, but that just made Jack crash.) But with the smaller buffer, the mic gets an additional 30-40 dB of gain, making the input unusable. If I turn the preamp on the fast track down very very low and speak quietly into the mic, the sound comes through without obvious distortion or glitches, so it doesn't seem to be an xrun thing. But it distorts very easily and very badly. If I switch back to 1024 samples, the problem disappears. Why would the driver's buffer size have an impact on the incoming signal's gain? Thanks, hjh

13 years

midi1 to midi 0

by christian bunge

Hi, I'm looking for a midi converter tool. Midi 0 to midi 1, and midi 1 to midi 0. thanks - chris

13 years

[OT] Flock the Vote (free CrossOver copy today)

by hermann meyer

Hi I guess that the one or the other Linux user still like to try the oe or the other windows application from time to time, without the need to install a VM, so it could be of some interest that CodeWeavers Inc. gives away a free copy of CrossOver today, 31.10.12 http://flock.codeweavers.com/

13 years

Audio distro for a Macbook pro

by Al Thompson

So a friend of mine at work has decided she wants to check out audio and MIDI on Linux. BUT, she has a Macbook Pro, and I've never paid any attention to distros that were for Macs. What's a good audio/MIDI (plus general purpose) distro that is easy to get running on a Macbook Pro?

13 years

First track of upcoming project!

by Gabbe Nord

Hello! Rather long time since I posted on this list now. Some of you may recognize me as "zth" on IRC. =) I've been working on a little project this summer/fall, which I'm kind of finishing up now. It will be some sort of blend of hiphop/pop/acoustic with a few electronic influences, and all instrumentals. The full project will be ~10 songs I think. I wanted to share the first song of this project, if people are interested. I would be honored if you took a listen to this and said what you think! =) It's called *Who Stole My Stuff *and is available here: http://soundcloud.com/zthmusic/who-stole-my-stuff ..and for direct download (mp3) on: https://dl.dropbox.com/u/19258546/zthmusic%20-%20Who%20Stole%20My%20Stuff.m… tinyURL: http://tinyurl.com/99mpcqe I also want to throw a thanks to Brian Beck (designbybeck) for helping me out with the artwork! Thanks a ton for listening/checking this out, if you want to! Regards, Gabriel

13 years

question about jackdmp's ability to detect its soundcard has disconnected

by Ivica Ico Bukvic

All, I noticed since upgrading to Ubuntu 12.04 that the default Jack server is jackdmp (v.1.9.8). Please correct me if I am wrong but my understanding this is the smp-enabled version 2 that is being developed in parallel with 1.x series of regular jack. Either way, one of my concerns is that while in the old jack when one accidentally pulled the soundcard jack was trying to talk to (e.g. a USB soundcard), the jack would gracefully stop. The new version (and this could be Ubuntu quirk) instead of stopping is pegged in some kind of a spinlock that often times locks up the machine (this may be in part since I am running a lowlatency kernel with audio group given priority) and at times keeps it operational while hogging the cpu and making the computer barely responsive until jackd is killed. Apps connected to jack that I tested so far are also stuck in a loop waiting for a response from jack (although this could be the app's shortcoming)--jack never broadcasts a signal that it has lost the soundcard (AFAICT). FWIW I am running jackdmp through qjackctl... Any thoughts on this matter would be most appreciated. Ivica Ico Bukvic, D.M.A. Composition, Music Technology Director, DISIS Interactive Sound & Intermedia Studio Director, L2Ork Linux Laptop Orchestra Head, ICAT IMPACT Studio 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/

13 years

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Linux-audio-user October 2012