Linux-audio-dev

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7448 discussions

by J. Liles

As some of you may recall, every time I've posted a demo video to LAD, I've had to include a disclaimer excusing the poor quality due to a lack of functional screencasting tools. Well, it took a couple of weeks of hair pulling and many, many hours of testing, but I finally arrived at a solution. Anyone who wants to create a screencast and record audio via JACK *in perfect sync* must do the following: Get ffmpeg. Apply this patch to it: https://github.com/original-male/FFmpeg/commit/d02509d04d396a98646ca81e9ba3… Build it with vorbis and h264 support. Then, start your favorite desktop environment. I use Xephyr for this. Have jack running (at -r 48000) Then run the following command: ffmpeg -fflags +genpts+igndts -f x11grab -vsync 0 -r 30 -s 1920x1080 -i :${DISPLAY}.+0,0 -vcodec h264 -f jack -ac 2 -r:a 48000 -i screencast -acodec pcm_s16le -r:v 30 -vsync 2 -async 1 -map 0:0,1,0 -map 1:0 -preset ultrafast -qp 0 "$FILE" Where DISPLAY is the number of your X11 display and FILE is the filename for the screencast. I use a .mkv extension for the matroska container. Remember to connect the streams you want recorded to the 'screencast' JACK inputs! With this setup I'm able to record a full 30 FPS @ 1080P with audio in perfect sync. Please share your results too. With some more evidence I might have a good case to get ffmpeg to accept my patch. Enjoy!

11 years

ARM audio coder

by Jean-Baptiste Thiebaut

Hi there, Apologies for cross-posting. We're looking for a Linux embedded coder, preferably in London, for a short-term optimisation gig on an ARM 8. To start immediately. Salary depending on experience / delivery. http://weareroli.com Let me know if you're interested! Goal: - Optimisation of C++ code to match the target accelerator engine NEON - Development of a custom shared DSP library based on the NEON instruction set Skills: - Excellent understanding of the low level ARM architecture (Vector floating point unit, SIMD, NEON) - High proficiency with C/C++, ASM, Unit Testing - Experience in audio DSP algorithm embedded integration - High efficiency audio coding experience - Excellent knowledge of the standard tools such as gcc, gbd Best regards, Jean-Baptiste

11 years

Re: [LAD] [off-list] who wants contribute to Advanced Gtk+ Sequencer

by Joël Krähemann

Am Dienstag, den 24.09.2013, 20:11 +0200 schrieb Ralf Mardorf: > Hi :) > > I used the new tar, but next time I can checkout from svn. > > It failed to build again. > > checking for XMLRPC... no > configure: error: Package requirements (xmlrpc >= 1.32.5) were not met: > > No package 'xmlrpc' found > > Consider adjusting the PKG_CONFIG_PATH environment variable if you > installed software in a non-standard prefix. > > Alternatively, you may set the environment variables XMLRPC_CFLAGS > and XMLRPC_LIBS to avoid the need to call pkg-config. > See the pkg-config man page for more details. > [rocketmouse@archlinux ags_0.3.99]$ sudo pacman -Q xmlrpc-c > xmlrpc-c 1:1.33.03-1 > > Regards, > Ralf > https://apps.fedoraproject.org/packages/xmlrpc-c-client alien the package if using debian or derivates. Is without xmlrpc but has missing bugfixes ... https://github.com/weedlight/ags/tree/master/0.4.0/src/ags I'll update github.com repo excluding xmlrpc. The server isn't started by default and is only a collection of ideas whereas many skelletons for a XML based scripting client. See for further details: https://sourceforge.net/p/ags/code/HEAD/tree/src/ags-client/scripting/ags_s… regards Joël

11 years

who wants contribute to Advanced Gtk+ Sequencer

by Joël Krähemann

Hi, I'm writing a software synth/sequencer called Advanced Gtk+ Sequencer. It won't take much time till first pre-release 0.4.0 I got basic functions working. Now I'm pleased to ask if someone wants to contribute. Note pulseaudio interferes with Advanced Gtk+ Sequencer to achieve best results I even recommend WindowMaker as desktop or any minimal window manager of your choice. http://sourceforge.net/projects/ags/ If your asking yourself how to use Advanced Gtk+ Sequencer please take a look at a screencast I just made this morning on Google+ The project features a wiki with some programming howtos and explanation of internals. bye Joël

11 years

Re: [LAD] Forking JackMix

by Thijs van severen

Behold the beauty of FOSS ! (A fine example of how it can also be done) Op 20-sep.-2013 23:46 schreef "Arnold Krille" <arnold(a)arnoldarts.de> het volgende: On Fri, 20 Sep 2013 12:45:45 +0100 Dr Nicholas J Bailey <nicholas.bailey(a)glasgow.ac.uk> wrote: > Ha, it seems I submitted news about a fork right into a firestorm! > > Well, I've done it, take it or leave it. > > For the record, I did email Arnold Krille several times without > getting a reply, which is fine because there isn't a law which says > he has to answer emails from me. Mostly due to the fact that I don't answer when there is no time. And then tend to forget these mails when they drop below the fold... > Also, the (C) on that software says > -2007, so I went ahead. It probably wasn't a good time in retrospect. It was at the best of times! And its not the first fork of JackMix, but probably the first on github... > I didn't intend to upset Arnold or anybody else, but the only way I'm > taking my "fork" off github is if Arnold thinks it's good enough to > make it mainstream, which would be an honour and a privilege. The main concern for me is that (if I understand git correctly) its now not possible for me to import my private subversion history of JackMix into github and then officially mark yours as the fork... As my vcs was private all the past time, thats not a big concern. You could also have given your project a new name. Which is hard when the good names are all taken... But seeing as I don't really have time for audio-programming since quite some years, please continue! > I still really hope Arnold is going to let me ask him some > questions about his code! I don't know if I can answer your questions. As you rightly noticed, its been some time since I wrote that code. I would write it differently today (test-driven, gui in python and only the mixing-engine in C++). I kind of started parts for a rewrite, there's a mixing-matrix-gui in ffado-mixer thats similar and I have some local beginnings of a crossbar-router for jack (patchage with rows and cols instead of a free canvas) with network-transparent separation of gui and core. But that never really hit of with me due to a lack of time and need... Anyway, please remind me to look at your project, create a nice page on github for it and remind me to set a link to that page on my domain. I hereby proclaim you the new lead for JackMix! Have fun, Arnold _______________________________________________ Linux-audio-dev mailing list Linux-audio-dev(a)lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev

11 years

Re: [LAD] Aeolus

by geoff

I agree with Nils 100%. Fons mentions the second fork seems to be changing the license. Both situations are ignorant of the spirit of FOSS in my opinion. If you go commercial let me know. I'll buy everything you make ! g Sent from my smartphone. -------- Original message -------- From: Fons Adriaensen <fons(a)linuxaudio.org> Date: 19/09/2013 7:16 AM (GMT+10:00) To: Linux Audio Users <linux-audio-user(a)lists.linuxaudio.org>,Linux Audio Developers <linux-audio-dev(a)lists.linuxaudio.org> Subject: [LAD] Aeolus Hello all, It has come to my attention that there are ATM at least two 'forks' of Aeolus. The first by the MuseScore team, the second by one Maurizio Gavioli. Neither of them even had the decency to let me know of their work, and both are taking Aeolus in a direction I do not approve of. Gavioli has even added his 'copyright' to the sources of the libraries that Aeolus depends on but which are not part of its source distribution. Apparently the intention is to release incompatible versions of those as well. If this is typical for the attitude taken by the Linux Audio community then my motivation to contribute to it will take a serious blow. As announced previously, there will be a fully reworked release of Aeolus next year (on the occasion of its 10th birthday). Apart from major improvements to the audio code it will be completely OSC controlled. None of this will be compatible with the forks of course, they'll find themselves instantly obsolete. And I will make sure that this sort of thing won't happen again, even if that means a more restrictive license. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow) _______________________________________________ Linux-audio-dev mailing list Linux-audio-dev(a)lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev

11 years

Re: [LAD] [LAU] Just an information about the state of affairs - Re: forking (was Re: Aeolus)

by Ralf Mardorf

Didn't came through the lists. -------- Forwarded Message -------- From: Ralf Mardorf To: linux-audio-user(a)lists.linuxaudio.org, linux-audio-dev <linux-audio-dev(a)lists.linuxaudio.org> Subject: Re: [LAU] [LAD] Just an information about the state of affairs - Re: forking (was Re: Aeolus) Date: Sun, 22 Sep 2013 11:37:48 +0200 On Sun, 2013-09-22 at 11:14 +0200, Felix Homann wrote: > Fons, I think you should still clarify your position on using your > code [snip] In this case I'm on Fons site. He explained it more than one time, so there isn't the need to repeat it again and again. There are several mails from Fons similar to the following, explaining his point of view. -------- Forwarded Message -------- From: Fons Adriaensen <fons(a)linuxaudio.org> To: J. Liles <malnourite(a)gmail.com> Cc: lad <linux-audio-dev(a)lists.linuxaudio.org> Subject: Re: [LAD] forking (was Re: Aeolus) Date: Fri, 20 Sep 2013 21:28:39 +0000 On Fri, Sep 20, 2013 at 01:50:41PM -0700, J. Liles wrote: > On Fri, Sep 20, 2013 at 1:24 PM, Fons Adriaensen <fons(a)linuxaudio.org>wrote: > > > 'Convenient' is the key word here. Some people only think > > of what's 'convenient' to them, everything else is too much > > for their simple minds. > > > > > Fons, you have to admit that with comments like that, you're making it > rather hard for those of us trying to be on your side in this matter. You don't have to be 'on my side'. > Help me understand how this is an evolved, logical response, One of the designed-in qualities of Aeolus is that it respects, as much as is possible within the context of a software emulation, the traditions of organ building. Which are very conservative, anti-technology and whatever you want, like it or not. Any changes that violate that principle, no matter how convenient to the average user, destroy that quality and consequently harm my interests as an author. Maybe you find that difficult to understand, but that's how it is. Maybe the free software community fails to understand that, in which case I feel completely justified not to contribute to it.

11 years

forking

by tom＠trellis.ch

hi there, i've read the aeolus / fork mails with interest and it seems like an outburst of opinions (which is good!). my view is a bit less of technical nature. i can't judge if code a is better or worse than b, i can only make out a difference in using it. that said, the broad field of users and their needs should be considered in this discussion. there are a few non-technical aspects that needs to be understood in order to tackle it more sensitively. -very talented people can lack (like others) the ability to communicate "well" with others, whatever that might mean -there are different kinds of "forks". to judge if it's a "bad" or a "good" fork one must look at it in a differentiated way -"bad" can be "good" for others and vice versa -Linux people are a minority concerning the OS in use. this group is further split to smaller partitions. There are many fundamentals that people use to differentiate themselves. the great benefits of the variety also have the "me cool gentoo - you stupid ubuntu" effect. looking at extreme "fork" cases to analyze the effects (*why* one does fork not listed here): -dude forks projext x from author y and makes a piece of crap out of it -author sees his work dragged to dirt, while still being mentioned as author -author sees his reputation at risk -dude forks project x from author y (a piece of crap) and makes butter out of it -author feels that dude thinks he knows everyting better -author might loose control if fork gains more interest than the original -dude forks project x from author y, changes some indendations, and put himself as main author -author feels like dude is using author's work to adorn himself with borrowed plumes wihtout added value -dude forks project x from author y, puts it to a public repository where it appears as the main project (and not as a fork) -author feels like dude is using author's work to adorn himself with borrowed plumes wihtout added value -dude forks project x from author y, makes commercially a fortune with it, without much changes -author feels like dude is making money of of author's work while author migh have no interest or success doing so facit: -anyone can do bad things if he/she just want's to bitch around -there are some unwritten / non-license-dependant gentleman's agreements how to fork and communicate -the art is to make use of the power that forks can offer -i think there are only few hostile forks out there my personal experience with forks is limited to basially two projects, one of which is ardour. i personally see it as a working prototype and a way to dive into the code base (and doing it wrong). there was never an issue with ardour's main author paul davis, he even gives hints (if the schedule allows it), knowing that many modifications are of questionable coding quailty or of no interest for him / ardour master. as a last word, we should not forget that doing forks in a sourcetree is by the word a natural thing to happen. <- my 1 cent cheers, thomas

11 years

GPL under pressure

by Ralf Mardorf

My last words to and perhaps reading of the threads about the evil that someone forked a project from Fons, that was GPL'ed by Fons and nobody else. Nobody showed a violation of the GPL by Maurizio M. Gavioli, just a mistake he seemingly is willing to correct after I contacted him, something Fons could have done too. Humans tend to make mistakes. If Fons makes a mistake it's ok, if somebody else makes a mistake she/he is bad, should shut up, should stop forking a project, should be fired. Fons made a mistake, he chose the GPL, while he disagrees with the GPL. And now I read to often "please, please Fons, continue writing GPL'ed software, we will reinterpret the GPL for you". Fons is free to stop contributing or to continue contributing by using another license, but if he chose the GPL, he's the only one to blame and not Maurizio M. Gavioli. Calling him simple-minded (because he is one of those Fons was talking about, even while he didn't use Maurizio's name) is offending netiquette, not forking the project is offending netiquette. "Aeolus is meant to emulate a pipe organ, including the limits of a real one. It's not meant to be a backend to some sequencer or notation software, or a general-purpose additive synthesiser." - Fons Maurizio M. Gavioli seems to fork it, for usage with notation software. Any discussion about something that should be wrong with doing this, is a shame and does harm the GPL. Regards, Ralf

11 years

Forking JackMix

by Dr Nicholas J Bailey

Ha, it seems I submitted news about a fork right into a firestorm! Well, I've done it, take it or leave it. For the record, I did email Arnold Krille several times without getting a reply, which is fine because there isn't a law which says he has to answer emails from me. Also, the (C) on that software says -2007, so I went ahead. It probably wasn't a good time in retrospect. But hey, the last digest was full of people ranting about forks, plus my post about actually having done one. 1. Code didn't do what I wanted. 2. Made code do what I wanted. 3. Released code (3) is the whole point of FOSS isn't it? I didn't intend to upset Arnold or anybody else, but the only way I'm taking my "fork" off github is if Arnold thinks it's good enough to make it mainstream, which would be an honour and a privilege. Also, it was more than a week's work (mostly understanding the existing code base), which means I reckon I deserve a place on the author list. If Fons thinks I'm a "dog pissing on a lampost or some juvenile spraying his tags on someone else's property", we'll have to agree to differ. I still really hope Arnold is going to let me ask him some questions about his code! I don't actually know anything about what caused all the fuss in the first place, but it's a bit of a shame when people fall out. Politics... blegh! Nick/. Science and Music Research Group, Glasgow, Scotland.

11 years

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Linux-audio-dev