Linux-audio-user November 2023

linux-audio-user@lists.linuxaudio.org

7 participants
5 discussions

by Will Godfrey

Does anyone know of software that can generate MIDI messages from a touchpad? The idea would be to send CCs to a sequencer or soft synth, but being able to send it to an external hardware device would also be very useful. -- Will J Godfrey 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, 3 months

[LAU] 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

2 years, 2 months

[LAU] [ANN] Qtractor 0.9.36 - An Autumn'23 Release

by Rui Nuno Capela

Howdy! Qtractor 0.9.36 (autumn'23) is released! Change-log: - Multiple audio and/or MIDI files may now appear as arguments on the command line and get immediately imported into a new session; also, any audio or MIDI file may now be promptly imported into a new session from the main File/Open... dialog. - New MIDI clip tool option added: Rescale/Invert. - Introducing brand new MIDI clip tool: Tempo ramp. - Disable or better hide the Add Tracks option on the MIDI tracks export dialog. - Fixed a yearlong bug in MIDI file import/export of tempo, time and key signatures and markers, to severely wrong locations. - Enable Aux-Send inserts on output buses, but list possible target buses only; audio output buses are now listed as possible targets iif they follow or succeed the source one (in internal processing order). - Fixed MIDI tracks latency compensation, now working as expected. - Show current/total plugins latency on the Track properties dialog, - Fixed MIDI Step-input for non-zero offset clips. 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-0.9.36.tar.gz - source package (openSUSE Tubleweed): https://download.sf.net/qtractor/qtractor-0.9.36-79.1.rncbc.suse.src.rpm - binary package (openSUSE Tubleweed): https://download.sf.net/qtractor/qtractor-0.9.36-79.1.rncbc.suse.x86_64.rpm - AppImage [7] package: https://download.sf.net/qtractor/qtractor-0.9.36-79.1.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 (outdated; help wanted!): 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/2485 Cheers && Have fun! -- rncbc aka Rui Nuno Capela

2 years, 2 months

[LAU] SoundTracker 1.0.5-pre1 released

by Yury Aliaev

Hi all, The first pre-release of SoundTracker v1.0.5 is done. The main feature of 1.0.5 release is full support of stereo samples (MODPlug XM / XI extension), including conversion between mono and stereo samples and some specific editing functions. This pre-release also includes some less important updates and fixes. You can find more new features in NEWS file. SoundTracker download page: https://sourceforge.net/projects/soundtracker/files/ Regards, Yury.

2 years, 2 months

[LAU] SpectMorph 0.6.1

by Stefan Westerfeld

SpectMorph 0.6.1 has been released. The main changes are: - Instrument editor improvements - Support for multiple banks for WavSources - New standard instruments - The code is now hard RT capable - UI fixes for macOS What is SpectMorph? ------------------- SpectMorph is a free software project which allows to analyze samples of musical instruments, and to combine them (morphing). It can be used to construct hybrid sounds, for instance a sound between a trumpet and a flute; or smooth transitions, for instance a sound that starts as a trumpet and then gradually changes to a flute. SpectMorph ships with many ready-to-use instruments which can be combined using morphing. SpectMorph is implemented in C++ and licensed under the GNU LGPL version 2.1 or later Integrating SpectMorph into your Work ------------------------------------- SpectMorph is currently available for Linux, Windows and macOS (Intel and Apple Silicon), with CLAP/LV2/VST plugins. Under Linux, there is also JACK Support. Links: ------ Website: http://www.spectmorph.org Download: http://www.spectmorph.org/downloads There are many audio demos on the website, which demonstrate morphing between instruments. List of Changes in SpectMorph 0.6.1: ------------------------------------ #### Instrument Editor * Support click & drag sample to scroll & zoom (#22). * Support stereo to mono conversion when loading stereo samples (#14). * Add manual volume editing / normalization. * Implement automatic selection triggered by midi. #### New instruments * Bass Flute * Soprano Saxophone * Clarinet, Bass Clarinet * Tenor Trombone * Viola, Double Bass * Make samples and meta information for standard instruments available on github. #### Improvements * Support multiple banks for WavSources / instrument editor. * Avoid allocations in DSP thread to be hard RT capable. * Allow overriding analysis parameter for frame stepping to get higher time resolution. #### Fixes * Make UI work properly in Ableton Live (and possibly other hosts) on macOS. * Fix UI scaling problem on M1 macOS builds. * Fix crash if instrument editor is closed without any samples. * Fix cases of undefined behaviour. * Fix timing problems for long notes, reproduce long WavSource notes with exact tempo. * Fix use-after-free for outdated control events. * Fix freetype related memory leak. -- Stefan Westerfeld, http://space.twc.de/~stefan

2 years, 2 months

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Linux-audio-user November 2023