Linux-audio-user June 2006

linux-audio-user@lists.linuxaudio.org

150 participants
123 discussions

[linux-audio-user] Stereo compressor that reports latency?

by Petter Sundlöf

Is anyone here aware of a stereo compressor plugin (LADSPA) suitable for drums and/or bass that reports latency? I've been using SC4, but realized it adds latency and does not report it! :/ So my mix is basically held back by this... I can hear the delay, it's definitely there. So, not having to resort to using an artificial latency plugin would be nice. Cheers.

17 years, 10 months

[linux-audio-user] Stretching with very high accuracy

by Alex Polite

Hi there. I'm developing a little tool to automatically sync two audio recordings of the same event made with two different recorders. I've got the algorithms worked out and can correctly compute the drift and offset between the files in my test recording. The next step is to pad, stretch and mix the two files into one perfectly synced stereo file. The drift is very small. In my test recording the drift is only 53 milliseconds over the course of an hour. My stretch factor is 0.99998525762821 I've tried to stretch the file with sox: sox infile.wav outfile.wav stretch 0.99998525762821 When I try to line up the files in a ardour I realise that the stretch sox makes is hugely inaccurate. For testing purposes I tried to stretch an hourly long file (44.1kHz) by some 2000 samples, but the resulting file was some 30000 samples longer. The stretch was off by more than 0.5 seconds! Is there anything I can do to increase the accuracy of sox? Is there any other tool out there that will do a better job at stretching with very high accuracy? alex -- Alex Polite http://flosspick.org - finding the right open source

17 years, 10 months

[linux-audio-user] How to get around PID attached to jackd clients?

by Robert F. Scheer

On my Ubuntu Dapper system, I'm having trouble with jack clients such as xmms and jack-rack showing up in the list of clients with their PID (process ID) attached to their app-names. My convolver program BruteFIR expects the clients to have fixed names. Easy fix or workaround for this?

17 years, 10 months

[linux-audio-user] New RT testing tool

by Lee Revell

Someone just posted this to LKML, it looks interesting: A README describing the rt-exec can be found at ftp://ftp.compro.net/public/rt-exec/README It can be downloaded from ftp://ftp.compro.net/public/rt-exec/rt-exec-1.0.0.tar.bz2 Lee

17 years, 10 months

[linux-audio-user] Kontakt 2 usable under Linux?

by Tim Howard

Hello all, I'm interested in a Kontakt 2 sample library (the Stradivari by Garritan, see http://www.garritan.com/stradivari.html) which I think looks absolutely awesome. But there is a slight problem... I don't have Kontakt 2, and I'm not sure if this type of library can be used under Linux. Does anyone here have any experience using Kontakt 2 libraries under Linux? If so, how did you go about it? I'm not completely opposed to buying/using commercial software if necessary, but I would much prefer an open-source solution. Any suggestions? Thanks, -TimH

17 years, 10 months

[linux-audio-user] jack.udp clips

by Alban Peignier

We have a rivendell workstation which sends sound to a streaming server via jack.udp. I'm finishing the setup of our new rivendell workstation. The jack system (jackd realtime with alsa driver with rivendell) is very robust. Building the nvidia kernel module doesn't disturb the sound output :o) Everything is fine except .. jack.udp. jack.udp is clipping on a simple desktop switch :'( When the system is a bit loaded, the streaming server receives a very disturbed sound. At the same moment, the alsa ouput or the jack.backup output (looping jack.record) are perfect. I tried various buffer size for jack.udp (from 4096 to 20000 ..). At 4096, I have a error message (UDP thread too slow). With bigger buffers, no message. I reniced jack.udp to -5, -10, -15 .. No changes .. Anyone experienced the same kind of problem ? -- Alban Peignier <alban.peignier(a)free.fr> http://people.tryphon.org/~alban

17 years, 10 months

[linux-audio-user] Link: Extremely high quality free music

by Carlo Capocasa

For all of you who have been waiting for some amazing sounds that are high quality music first and libre second, I have found just that here: http://www.chillheimer.com Some of these sounds simply brought me to other places... they even have a song called 'Mind Travel'. I can't say exactly in what way but listening to the stuff is enlightening. Ambient, Jungle, Deep house genres and a lot of blending a few completely new styles, 61 tunes. Carlo

17 years, 10 months

[linux-audio-user] Realtime Audio + Networking

by Joshua Boyd

I have a realtime audio/video system that almost works fine. I'm not too terribly concered with latency, so I'm using 400 samples of buffering both in and out. For the most part it all works. System load is about 1.5 according to top, and the 3 processes of my system list approximately 75% combined CPU usage. However, I need the system to be network connected. I need it to have sshd, snmpd, and some web server (not yet decided upon) running. When I turn them on, any network traffic to either service causes glitches in the audio, and possibly lost video frames. I am using Linux 2.6.12 plus bigphysarea patch. I'm using a custom non-Alsa sound card driver (when I started, I needed all of the AES metadata, but I no longer do. At this point it is too late for me to convert to using alsa though). I can provide my kernel .config file if that would help. I have CONFIG_PREEMPT and CONFIG_PREEMPT_BKL on. My application runs with SCHED_FIFO and has an elevated priority, but not realtime priority. When I tried setting it to realtime priority it grinds the networking, control panel, and VGA display applications to a halt. If I set the audio driver to loop back, the network never interupts it. It would be difficult to move the entire audio portion of my system into a kernel module though. I've been watching for awhile and haven't seen to much about how to fix this. Meanwhile, I've been tangling with this for months. -- Joshua D. Boyd jdboyd(a)jdboyd.net http://www.jdboyd.net/ http://www.joshuaboyd.org/

17 years, 10 months

[linux-audio-user] Tuning Bristol

by Esa Linna

Does anyone else have a problem with Bristol's tuning? I really like to play with it and love the sounds, but it seems that it's not in the same tune than other soft synths. Tuning the synths via gui does not solve the problem. Nick? My audigy uses samplerate of 48khz, if that helps to answer. Thanks -- ----------------------- http://www.emvg.net/esa http://www.emvg.net -----------------------

17 years, 10 months

Re: [linux-audio-user] How to get around PID attached to jackd clients?

by Robert F. Scheer

I figured it out! Applications like xmms and jack-rack show up in the jack connection list with their PID's appended and this was a bit difficult to reconcile with brutefir, which wants the user to name the in's and out's in a config file. The solution was already built into brutefir and I just configured the qjackctl patchbay to recognize the ports and connect them properly. The brutefir config file should name it's inputs as follows: input 0, 1 { device: "jack" { ports: "", "";}; sample: "AUTO"; channels: 2;};

17 years, 10 months

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Linux-audio-user June 2006