Bradley Kuhn wrote a very lucid article about how to
approach GPL violations:
http://ebb.org/bkuhn/blog/2009/11/08/gpl-enforcement.html
Since we all run in to this... it seemed appropriate to post
to this list. :-)
Peace,
Gabriel
Hello all,
A new release of jack_delay is available at
<http://kokkinizita.linuxaudio.org/linuxaudio/downloads>
> From the README:
jack_delay 0.4.0 - 18/04/2011
-------------------------------
Jack_delay can be used to measure the round-trip latency of a soundcard.
To do this, start the program and connect like this:
jack_delay -> playback_port -> cable from soundcard output to input -> capture port -> jack_delay
Jack_delay generates a signal consisting of 13 sine waves, measures the
phase difference between the input and output for each of these, and
computes the delay from those phase differences. The algorithm used is
one developed originally for satellite ranging - that is measuring the
distance between a satellite and a ground station.
With a good sound card jack_delay will measure the round-trip latency
with an accuracy of around 1/1000 of a sample. The assumption is that
the delay is more or less independent of frequency. The actual value
displayed is the one for a frequency of 1/16 of the sample rate. The
phase measurement for this frequency of course only provides a result
in the range of 0..16 samples. The other frequencies are used to extend
this interval to 4096 * 16 samples, more than a second at 48 kHz.
This release should be much less sensitive to frequency-dependent delay
than the previous ones.
The following options are avaiable (use jack_delay -h to see them):
-O playback port connect output to named port.
-I capture port connect input to named port.
-E show excess latency instead of full latency.
Using -E requires -O and -I, as the the computation depends on
the latency values reported by jack for the ports used.
The excess latency is the measured value minus the expected one,
taking into account any corrections set by jack's -I and -O options.
That is, if you have the right values for these options, then the
value displayed with -E will be at most +/- half a sample.
To determine the correct values for jack's -I and -O, set both
of them to zero ('default' in qjackctl) and measure the latency
using the -E option. Then set each of the -I and -O options to
half the value displayed.
Ciao,
--
FA
One thing I forgot to mention: this release of jack_delay
requires a Jack version providing the new latency API.
AFAIK that is Jack >= 0.120.1
Ciao,
--
FA
Dear list,
I've done a first general workshop on Linux, FLOSS etc. as training
conservatoire activity. A second one will be more of a a demo/tutorial
with focus on audio/multimedia, I'd like it to also be hands-on. So my
idea was to take a bunch of "audio-ready" live distro discs.
Surprise surprise... most of the attendees will have a mac book pro, so
workability on this platform is desired (sigh!)
My two candidates are puredyne and AVLinux. The first in particular
comes with Pure Data which I would like to use. Both worked without a
glitch on my HP laptop (apart the fact I couldn't figure out how to get
the 3rd level keyboard modifier in puredyne (AltGr on Italian keyboard)).
On a mac laptop I was able to test puredyne halts and drops to a console
while booting. AVLinux starts although wifi is not there. Probably I
could go with AVLinux and put the Pure Data and required packages on a
USB stick.
I haven't tested it but if wifi worked ok we might start with vanilla
ubuntu and pull the desired packages, but I fear that would take away
too much time, although instructive about the installation procedure.
Anyway I'd be happy to hear more advice hints, as I have no real
experience about running linux (live or installed) on macs.
Thanks,
Lorenzo.
A few weeks ago I was asked if I was interested in supplying some backing music
for a CGI animated film. This film is truly exceptional so I of course jumped
at the chance.
There is a link here for the completed work. I'm sure you'll enjoy it :)
http://www.youtube.com/user/smeedysyd
--
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.
My current machine is now over 4 years old. Last year it started acting up, but
I was able to trace this to various mechanical problems. However, over the last
couple of months it has developed an intermittent total freeze. I've tried all
the usual pulling out bits and/or reshuffling them but it makes no difference.
Also they fault is *really* intermittent. The machine can run for 2 days without
problems, or it can freeze within 5 minutes of switch on. It also seems to make
no difference whether the thing is working flat out or just idling.
As I frequently save work, I've never lost more than about 15 minutes worth,
but still I no longer trust the machine so need to look for a replacement. For
philosophical reasons I'd prefer to stick with AMD. Other than that I pretty
easy going.
Most of my work is with Yoshimi (which is a hungry beast) so raw processing
power is important. Also, I've started to do microphone work as well as guitar
so noise level is much more of an issue.
From way before I got my last machine I've been using a 2496 sound card, which
has served me extremely well, however I'm inclined to think that is also overdue
for replacement - I would need both MIDI and audio capability.
Anyone got any suggestions? Please bear in mind that I'm in the UK so purchases
from abroad might be problematical.
--
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.
This is what I use:
http://www.dynaudioacoustics.com/Default.asp?Id=3680
J.
--- On Sat, 4/16/11, Gabbe Nord <gabbe.nord(a)gmail.com> wrote:
From: Gabbe Nord <gabbe.nord(a)gmail.com>
Subject: Re: [LAU] OT: Small studio monitors, or what are you using?
To: "Harry Van Haaren" <harryhaaren(a)gmail.com>
Cc: linux-audio-user(a)lists.linuxaudio.org
Date: Saturday, April 16, 2011, 5:13 AM
I agree with Harry, I use A3Xs for all my mixing and I like them very much. But, just as Harry said, it's not good for very bassy stuff.
On Sat, Apr 16, 2011 at 5:45 AM, Harry Van Haaren <harryhaaren(a)gmail.com> wrote:
Not answering your question at all: but I'd buy Adam A3X's. Personally I love the sound they make for clear listening, although im sure there's some out there that won't agree. They're tiny and well built.
I *wouldn't* use them to mix low-end heavy stuff (dubstep / hip hop) as they won't represent the very low lows at loud volumes, but hey, niether will your radio which is why you probably *should* mix on them
Counter argument to any argument, "if your speakers play it loud, it won't be loud in the mix" :D
-Harry
Hi everybody.
This is the second release of aj-snapshot, which is a command line
utility to store/restore ALSA and/or JACK connections.
For more information: goto http://aj-snapshot.sourceforge.net/
Changes in this release:
- Ask for confirmation when the user saves a snapshot over an existing file.
and added the '-f/--force' option to override this.
- Added the '-q/--quiet' option. With this option aj-snapshot will not report
any information about storing/restoring connections. This includes messages
about connections that aj-snapshot failed to restore, because they are not
considered an error in this context.
- Added an '-i/--ignore' option with which you can tell aj-snapshot to ignore
certain clients when storing/restoring connections.
- Made the connection messages more readable.
To clone the git repository:
git clone git://aj-snapshot.git.sourceforge.net/gitroot/aj-snapshot/aj-snapshot
Let me know if you have any questions...
I hope you enjoy :-)
lievenmoors
We have a talented mixing engineer in our midst that has fallen on some hard
times and been unable to find employment in this crappy economy. He is a
Linux user and a long-standing member of our community. He's been wanting to
do set up a rig at home so he can mix people's music for a fee. To help him
get up and running I'm taking collections to build him a computer and set it
up properly for using Ardour and the rest of the wonderful apps we have at
our disposal and then send it on to him. I'm pretty sure I can set him up
nicely for sub $300. I just don't have enough cash to pay it out of my own
pocket. So if you are interested in helping a great guy become a productive
member of our community then please help out by kicking in a few bucks. He's
requested that we don't send him money directly because he would probably
spend it on rent right now. So if you could Paypal me at
PipeManMusic(a)gmail.com or use the Paypal link on
http://opensourcemusician.libsyn.com I would appreciate it.
Also, if you all ready have a capable machine you could donate to the cause
that would be welcome too, however, please keep in mind I'm trying to set
him up properly so he can use large numbers of tracks and plugins, so no
outdated hardware please.
If you think of this post as tasteless and offensive then I apologize in
advance and hope you understand a guy trying to help out another guy out.
Thanks so much for reading,
Daniel Worth
Host
The Open Source Musician Podcast
http://opensourcemusician.com
