Linux-audio-user

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20641 discussions

Just in case it can benefit any list members

by David W. Jones

The Clarion: The accessible musical instrument trying to find its soul - BBC News https://www.bbc.com/news/disability-67623196 --- David W. Jones gnome(a)hawaii.rr.com exploring the landscape of god http://dancingtreefrog.com Sent from my Android device with F/LOSS K-9 Mail.

1 year, 7 months

Signing up disabled for all mailing lists

by Jeremy Jongepier

Dear all, Unfortunately I had to disable signing up for all linuxaudio.org mailing lists. This is due to a flood of fake accounts being created that send out subscription confirmations which sometimes get flagged as spam. This in turn leads to so-called Feedback Loop complaints from the abuse team of our hosting service (Hetzner). If we get too much of those we risk getting our mail traffic blocked or ending up on a RBL (Realtime Blacklist). So at the moment new subscriptions can only be done manually through me. This is very inconvenient of course so if anyone knows a better way to shield Mailman3 against bots creating fake accounts then please contact me, thanks in advance! Best regards and happy holidays!!! Jeremy linuxaudio.org admin

1 year, 7 months

Using keyframes in Shotcut for visually tracking accordion bass

by David Kastrup

I've recently made "prettified" accordion videos using closeups of both hands. That provides a pretty good distraction from the faces I pull when playing while still not nominally going for the "headless" look popular with some players likely having the same problem. <https://youtu.be/spAP7ODPCyg> Since the left hand moves all over the place with the bass part of the accordion, it requires keyframes to rein that movement in for the closeup. Shotcut recently acquired motion tracker, but so far I haven't got it to work, it doesn't track rotation, and there doesn't seem to be a way to apply results for creating a working closeup crop. So basically I went through the video until each bellows reversal and then straightened up the closeup, creating a keyframe. The greatest annoyance probably was that the rotation angle tended to be in the interval 350° to 20° and I had to manually convert every angle just below 360° into a negative angle in order to keep Shotcut from performing caprioles with the bass side of the accordion between keyframes. An option to constrain the rotation angle to some interval when using the visual controls for straightening things could be useful. I've worked with three cameras: one for the main video, one for each hand. The bass hand camera was tilted in a way to get as large an image as possible while keeping the bass side of the accordion somewhere in frame. On the audio side, this was sampled in Ardour with 96k on an Echo Audiofire card using jackd2 on Firewire (I had to ditch Pulsewire on Ubuntustudio because it got in the way). I employed the Guitarix wrapping of Zitareverb which does a much more convincing job than what Shotcut itself offers as "Reverb". Now if just my playing skills were up to what the tools do... Silk purses and all that. -- David Kastrup

1 year, 7 months

Sonja

by Will Godfrey

Now that the November KVR Cafe contest is out of the way I can publicise a much expanded version. Some of you might like it. https://willgodfrey.bandcamp.com/track/sonja -- Will J Godfrey {apparently now an 'elderly'} https://willgodfrey.bandcamp.com/ http://yoshimi.github.io Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song.

1 year, 8 months

jackd: using two different devices for in and out

by Peter P.

Hi list, I discovered that jackd can use different devices for input and output, which is great! I am wondering if there will be the occasional click if these two devices do not have synchronized word clocks? Or is there some clever (resampling?) going on behind the scenes? Thanks! Peter

1 year, 8 months

[ANN] Qtractor 0.9.37 - An End-of-Autumn'23 Release

by Rui Nuno Capela

Hi all! Qtractor 0.9.37 (end-of-autumn'23) is out! Change-log: - Fixed an ancient hack on session initialization to wait to JACK service start up, which hang up while on pipewire-jack >= 1.0.0. - Add default audio metronome sample files. - Fixed automation curve rescaling across multiple, more than just one or two, tempo-map node changes. - New MIDI Tool Resize / Legato duration option added. - MIDI Clip Editor (aka. piano-roll) thumb-view now taking tempo-map changes into account. - Audio metronome is enabled only when both the bar and beat sample files are provided. Description: Qtractor [1] is an audio/MIDI multi-track sequencer application written in C++ with the Qt framework [2]. Target platform is Linux, where the Jack Audio Connection Kit (JACK [3]) for audio and the Advanced Linux Sound Architecture (ALSA [4]) for MIDI are the main infrastructures to evolve as a fairly-featured Linux desktop audio workstation GUI, specially dedicated to the personal home-studio. Website: https://qtractor.org https://qtractor.sourceforge.io http://qtractor.sourceforge.net Project page: https://sourceforge.net/projects/qtractor Downloads: https://sourceforge.net/projects/qtractor/files - source tarball: https://download.sf.net/qtractor/qtractor-0.9.37.tar.gz - source package (openSUSE Tubleweed): https://download.sf.net/qtractor/qtractor-0.9.37-80.1.rncbc.suse.src.rpm - binary package (openSUSE Tubleweed): https://download.sf.net/qtractor/qtractor-0.9.37-80.1.rncbc.suse.x86_64.rpm - AppImage [7] package: https://download.sf.net/qtractor/qtractor-0.9.37-80.1.x86_64.AppImage - Flatpak [8] package (thanks Hubert Figuière): https://flathub.org/apps/details/org.rncbc.qtractor Git repos: https://git.code.sf.net/p/qtractor/code https://github.com/rncbc/qtractor.git https://gitlab.com/rncbc/qtractor.git https://codeberg.org/rncbc/qtractor.git Wiki (updated, thanks to Miguel Lacha): https://sourceforge.net/p/qtractor/wiki/ - static rendering: https://qtractor.org/doc http://qtractor.sourceforge.net/doc https://qtractor.sourceforge.io/doc - user manual & how-to's: https://download.sf.net/qtractor/qtractor-manual-and-howtos.epub https://download.sf.net/qtractor/qtractor-manual-and-howtos.pdf License: Qtractor [1] is free, open-source Linux Audio [5] software, distributed under the terms of the GNU General Public License (GPL [6]) version 2 or later. References: [1] Qtractor - An audio/MIDI multi-track sequencer https://qtractor.org https://qtractor.sourceforge.io http://qtractor.sourceforge.net [2] Qt framework, C++ class library and tools for cross-platform application and UI development https://qt.io/ [3] JACK Audio Connection Kit https://jackaudio.org [4] ALSA, Advanced Linux Sound Architecture https://www.alsa-project.org/ [5] Linux Audio consortium of libre software for audio-related work https://linuxaudio.org [6] GPL - GNU General Public License https://www.gnu.org/copyleft/gpl.html [7] AppImage, Linux apps that run anywhere https://appimage.org/ [8] Flatpak, next-generation technology for building and distributing desktop applications on Linux https://flatpak.org/ See also: https://www.rncbc.org/drupal/node/2509 Cheers && Keep the fun! - - - rncbc aka Rui Nuno Capela

1 year, 8 months

Apologies - it's now yoshimi V 2.3.1.3

by Will Godfrey

I failed to double check compiling a headless build and one of our blind users reported a build failure :( Now fixed, and a note added to my checklist. -- Will J Godfrey {apparently now an 'elderly'} https://willgodfrey.bandcamp.com/ http://yoshimi.github.io Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song.

1 year, 8 months

Yoshimi V 2.3.1.2 available now

by Will Godfrey

This is mostly a bugfix release, however there are a few useful improvements: From the Readme file: Version 2.3.1.2 Copy/Paste has been improved and unified between CLI and GUI. Improved discovery of most recent HTML guide location. Also available to the CLI. Small corrections and updates in the User Guide. Various bugfixes. For developers: Improved access to control data/descriptions, with updates. Updated various explanatory texts. Full details are in /doc/Yoshimi_2.3.1.2_features.txt Yoshimi source code is available from either: https://sourceforge.net/projects/yoshimi Or: https://github.com/Yoshimi/yoshimi Full build instructions are in 'INSTALL'. Our list archive is at: https://www.freelists.org/archive/yoshimi To post, email to: yoshimi(a)freelists.org -- Will J Godfrey {apparently now an 'elderly'} https://willgodfrey.bandcamp.com/ http://yoshimi.github.io Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song.

1 year, 8 months

Acid December 2023

by Set Hallstrom

Greetings LAU, Long time no read.. Time truly flies but then again, it means that it's already Acid December season! https://acid.datapop.se For those who don't know, Acid December is a thousand years old internet tradition, where people from all over the world send acid tracks. Then every day in december, the magic elves release one track. If there are 42 tracks, it goes on until the 42nd of December. Submissions for this edition are open until midnight, 31st December! Would be lovely to hear your take this year! either way, stay safe in cyberspace and take good care of eachother! From cold and grey Stockholm, with warm and colorful regards, -- Set Sakrecoer

1 year, 8 months

Partly OT: Video streaming from FOH to multiple targets

by Michael Jarosch

Hi! Not sure, if I'm on the right place, but I guess the LAU-people are trained to find solutions to extraordinary problems… I have a vision 8-) : I'm sitting at FOH, driving a theater show. I have - let's say - 3 projectors available. One on my back to cover the stage from the front, two behind the stage doing a rear projection on the right and the left. On every projector, there is a Raspberry Pi connected via HDMI, waiting to send videos to the projector. All Raspberries are connected to LAN, just like my linux-laptop from which the show is controlled. I know, I can reach similar with QLC+: Install the app on all the computers involved, setup 3 different Artnet-channels, configure a/some video function(s) and make each one accessible through a dmx-channel. Therefore, the videos that should be presented have to be on the Raspberries. I can copy them to the devices and configure the triggers on each before the show. But my goals are different: Keep it simple, keep it fast (in terms of latency, but also in terms of using light and fast apps and finally. in terms of not running through the venue to make some last-minute configurations) and let only one machine be the one that has to be configured - the main laptop at FOH. I'm not so far away from that - the tools and the technology seem to be there, already. With ffmpeg for example it's possible to stream videos from point to point in realtime. [code]ffmpeg -i [input-video] -f [streaming codec to use] udp://[reciever's network-adress]:[port][/code] (There are options to speed thing up and/or relieve the CPU, but take it as an easy example.) On the other side of the chain, ffplay or mpv can catch the stream and decode it in no time. [code]mpv udp://[transmitter's network-adress]:[port][/code] (Again: Optimizations left aside) Tried this myself in a LAN between a Ryzen5 2400G Desktop and a 10 year old Thinkpad and achieved latencies under 1s - which is good enough, even for professional use. Once, you found the best options for your setup you can use it over and over again with different video-inputs and destinations. Best of it: With a commandline code it's capable of being integrated in QLC+ or Linux Show Player (LiSP). And: With ffmpeg I can -tee video from audio stream, if I like, and keep the audio at the FOH. (Or send it back from one of the raspberries to FOH via net-jack or comparable. Keeping video and audio in sync will be another challenge, I see…) But there is one downside: If the receiver already plays the video, there is no big latency between sender and receiver (if the options are chosen well, of course). But: Catching the stream can take several seconds. So, what I need is a continuous stream on which I can send my videos. OBS can do this, but it's another resource intensive app and - as far as I know - I cannot send commands from QLC+ or LiSP to it. (I want ONE cue-player for all, you know…!) Also: I *guess* OBS can't handle more than 1 stream, at once (sending to the different RPi-receivers) - but with ffmpeg-commands it's easy…! I had the idea, sending a continuous stream by streamcasting a virtual desktop page and configure mpv to play on that in fullscreen, by demand. But I guess, this comes not so handy with more than one beamer. Any ideas in how to reach my goals? (You can suggest other apps than ffmpeg or mpv, of course!) (Disclaimer: I have also posted this to the Linux-Audio-Users-Mailinglist and will try to send it to a place, where ffmpeg-nerds are common. I will inform you if I get good thoughts from the other sources…) Greets! Mitsch

1 year, 8 months

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Linux-audio-user