Linux-audio-user May 2011

linux-audio-user@lists.linuxaudio.org

126 participants
101 discussions

Reduce or increase number of samples with LADSPA plugin

by Thor Andreassen

Hi, hope this is the right forum for such inquiries. I've failed to turn up any evidence that it is possible, if it is, could someone please point me to a plugin that does this? -- best regards Thor Andreassen

12 years, 11 months

Re: [LAU] Cpu scaling on performance, permanent

by rosea.grammostola

On 05/22/2011 03:53 PM, Robin Gareus wrote: > On 05/22/2011 12:15 PM, rosea.grammostola wrote: >> Hi Robin, >> >> I installed your jackfreqd tool on Debian, via the deb package. >> Do I have to do more to make this tool running properly? > no and yes. > > No, the tool works OOTB. Does the tool needs cpufrequtils? > You can verify it by running e.g. > jack_cpu -c 60 # generate 60% JACK-DSP load jack_cpu , is that a jack2 only tool? I don't have it here. > Check the JACK-load with `jack_cpu_load` or qjackctl. > To verify that frequency scaling works: Looking at GNOME > CPU-Freq-Scaling-Monitor (or similar) is the easiest way; otherwise: > sudo watch cat /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_cur_freq > > ..and.. > Yes, because you may need to disable bus-frequency scaling and PCI > power-saving in the BIOS. (here's what it says here, but your BIOS may > differ: C1E halt state disabled, EIST disabled, Turbo disabled).

12 years, 11 months

skipping chunks of video with ffmpeg2theora and icecast, DVinput

by Luka Prinčič // Nova deViator

hi, i have been doing videostreaming now number of times and somehow i always run into the same peculiar problem. whenever there is more action on camera, especially zoomins and a lot of audio (like bass and distorted vocals for example), the stream starts to continously skip chunks of video stream of about 0.5-1 second, every 0.5-1 second. does anyone had a similar problem or knows what is the culprit? any help greatly appreciated!! i'm using dvgrab --format dv1 - \ | ffmpeg2theora -f dv -x 393 -y 288 --no-skeleton -o /dev/stdout - \ | oggfwd skylined.org 8000 pass /mountpoint.ogv i tried different cameras and ffmpeg2theora 0.24 and (now) 0.27 dvgrab 3.5 ffmpeg2theora 0.24 and 0.27 oggfwd 0.2 icecast 2.3.2 ubuntu 10.4 with 2.6.32 generic-pae kernel. -- sujet est machinique! Nova deViator ¤ http://deviator.si ¤ http://skylined.org ¤

12 years, 11 months

BCF2000 & PulseAudio

by Kevin Cosgrove

I'm trying to get my BCF2000 control surface working with Ardour again. It worked fine before I upgraded to Mandriva 2010.1 (which subsequently upgraded itself to Mandriva 2010.2). I suspect that PulseAudio is involved, based on my /var/log/messages output, below kernel: usb 5-1: new full speed USB device using uhci_hcd and address 3 kernel: usb 5-1: New USB device found, idVendor=1397, idProduct=00bc kernel: usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 kernel: usb 5-1: Product: BCF2000 kernel: usb 5-1: Manufacturer: BEHRINGER pulseaudio[6456]: module-alsa-card.c: Failed to find a working profile. pulseaudio[6456]: module.c: Failed to load module "module-alsa-card" \ (argument: "device_id="3" name="usb-BEHRINGER_BCF2000-00-BCF2000" \ card_name="alsa_card.usb-BEHRINGER_BCF2000-00-BCF2000" tsched=yes \ ignore_dB=no card_properties="module-udev-detect.discovered=1""): \ initialization failed. Other than my control surface, Ardour 2.8.11 (compiled locally) works just fine. I searched the web for things like the above message. I found one bug for the "failed to find a working profile" in the PulseAudio website. That's related to a ThinkPad. I looked around the PulseAudio website for how to create a profile, and didn't find anything directly useful. Most of what I found was about 2 years old and recommended ways to remove PulseAudio from one's system. I did find out how to create one PulseAudio profile at this URL: http://www.pclinuxos.com/forum/index.php?topic=75147.0 PCLinuxOS is based on Mandriva, so I'm hopeful that this sort of recipe might work for the BCF2000. But, it looks like the heart of getting PulseAudio to work with JACK were the "load-module module -jack-*" lines in the .pa file. I don't know what to use for my control surface. I suspect, without evidence, that if I could create the correct .pa file with the correct module loading command(s), then this thing might work. But, I don't know what module(s) to try, nor even the right name for the .pa file. Anyone know how to configure a BCF2000 control surface to work with PulseAudio? Any suggestions? Thanks.... -- Kevin

12 years, 11 months

Off topic: building drum triggers for acoustic drums !

by Svend-Erik K Madsen

Hi list Anyone who has build drum triggers themselves ? I just ordered some piezo transducers to build my own triggers, but your experiences is most welcome regarding material used to encapsulate transducers, rubber, foam rubber, how thick the size, and so on. I planned to build it up on some angel bracket inside the drum shell and mount it on a lug screw so that the trigger will be placed underneath the drumhead near the rim, don't know if thats good or bad, and if a rim shoot would trigger too, of cause I don't want that to happen on my snare, for which I plan to build a separate rim shoot trigger too. Hope someone will share their experiences :) /Sv-e

12 years, 11 months

LinuxSampler CVS

by Bernardo Barros

Hi all LinuxSampler CVS is down for some days or is it just me? Thanks!

12 years, 11 months

Just a reminder

by Folderol

I see quite a few songs posted here - nothing wrong with that, but I wonder how many of you know about this: http://lam.fugal.net/ The site is dedicated to music made with linux, so it is a real shame so few people on here seem to post links there. -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song.

12 years, 11 months

Random RT performance after reboot

by S. Massy

Hello, Okay, I'm giving up on trying to explain this by myself and am seeking educated guesses from this list... Sometimes, after a reboot, my system's RT reliability seems glitchy and jackd gets killed by its watchdog, usually after running a few hours. At other times, jackd will remain rock-solid, literally for weeks, until I shut down my system. It's usually a matter of rebooting until the problem disapears. Setup: - Debian Testing AMD64 - USB soundcard (UA25EX) - jackd version 0.120.2 - jackd options: "-R -P55 -t1000 -dalsa -d hw:1,0 -r44100 -p64 -n3 -S" - rtirq set to give highest priority to USB irqs So far I have: - Tried to change which port various USB devices use, thinking some conflict might be causing this, without any result. - Until recently, I thought that booting the system with the soundcard plugged in solved the problem, but proved wrong. Any ideas? Cheers, S.M. --

12 years, 11 months

acid techno test

by James Morris

hi, i've been listening to (for nostalgia) a bit of acid/techno from around 1993/4/5/6 over the past few days. it seemed so simple, and there seemed so much similarity between the tracks that i mistakenly thought it would be easy to come up with something which paid homage in spirit to the techno of those days, while also adding some more modern twists. i always prefer the slightly weirder sounds, so of course that's something i've gone for with this track: http://jwm-art.net/audio/acid_techno_test1.mp3 but turns out it's not so easy to make this style of music after all! i've not made any tracks for a while, but it seems i still have a tendency to manipulate sound using lots of "am pitchshifters". don't know if i'll do anything else to this or not, not sure it's worth it at the moment. just thought i'd share to see what others (being those who like techno etc) thought. james.

12 years, 11 months

[LAA] [ANN] Release of aj-snapshot-0.9.4

by Lieven Moors

Hi everybody, I've just released aj-snapshot-0.9.4 Aj-snapshot is a command line utility to store/restore ALSA and JACK connections to/from an XML file. Changes in this release: - Make the -a and -j flags work together as expected, when they are combined. - Fixed bug where aj-snapshot would not restore connections to a2jmidid ports. - Refactoring of ignore-clients code. For more information: http://aj-snapshot.sourceforge.net/ To clone the git repository: git clone git://aj-snapshot.git.sourceforge.net/gitroot/aj-snapshot/aj-snapshot I hope you enjoy... lievenmoors

12 years, 11 months

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Linux-audio-user May 2011