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today's howtos

Software: Nvidia, MuseScore, Cockpit, Oracle Java and KDE/Krita

  • 2 Tools For Monitoring Nvidia GPUs On Linux (GUI And Command Line)

    This article presents 2 tools for monitoring Nvidia graphics cards on Linux: one that comes with a terminal user interface (TUI), so it runs in a console, and another one that uses a graphical user interface.

  • MuseScore 3.2 Released with Dozens of Bug Fixes

    Free scorewriter MuseScore 3.2 was released a day ago with dozens of bug-fixes as well as some improvements to user interface.

  • Cockpit 197

    Cockpit is the modern Linux admin interface. We release regularly. Here are the release notes from version 197.

  • New Oracle Java 11 Installer For Ubuntu Or Linux Mint (Using Local Oracle Java .tar.gz)

    As many of you already know, Oracle Java requires logging in to an Oracle account to download most versions (all except Oracle Java 12). A while back I created Oracle Java 11 and 12 installer packages (based on the package by Web Upd8), and a PPA for Ubuntu and Linux Mint. Since Oracle Java 11 can't be directly downloaded from Oracle any more, the installer no longer works, so I created a new installer that requires the user to create an Oracle account, download the Oracle Java 11 .tar.gz archive (the same version as the installer), and place the archive in /var/cache/oracle-jdk11-installer-local/. After this, you can install the oracle-java11-installer-local package, and it will set up Oracle Java 11 for you. Everything else works as before. You can install the oracle-java11-set-default-local package to set Oracle Java 11 as default for example (not only set it as default using a .jinfo file and update-alternatives, but also export the JAVA_HOME environment variable, etc.).

  • My first month on GSoC

    This first month of GSoC was a great learning experience for me, when speaking to my colleagues of how Summer of Code is being important to my professional life, I always respond that I’m finally learning to code and the basic of C++. Yes, maybe this is strange, I’m a second year undergraduate Computer Science student, have two year experience with C++. I should have learn to code by now right? Well, at least on my Campus you don’t learn to code applications or how to build stable, clean code. You learn to solve problems, and that’s something I got pretty good at, but when it came to code, well, I’m learning that now and I’m liking it a lot.

  • Snapshot Docker

    The idea of snapshots is to make copies of the current document and allow users to return to them at a later time. This is a part of my whole Google Summer of Code project, which aims to bring Krita a better undo/redo system. When fully implemented, it will fully replace the current mechanism that stores actions with one that stores different states. That is to say, Krita will create a snapshot of the document for every undoable step. [...] Another interesting thing is the palettes. Krita 4.2.0 allows documents to store their own, local palettes. The palette list is but a QList<KoColorSet *>, meaning that only creating a new QList of the same pointers will not work. This is because, the palettes are controlled by canvas resource manager, which takes the responsibility to delete them. Therefore, when taking snapshots, we had better take deep copies of the KoColorSets. And then another problem comes: the snapshots own their KoColorSets because they are not controlled by the resource manager in any way; but the KisDocument in the view does not. So we have to set up another flag, ownsPaletteList, to tell the document whether it should delete the palettes in the destructor. And now the work has shifted to the refactoring of kritaflake, the library that mainly handles vector layers and shapes. I converted the whole KoShape hierarchy to implicit sharing where possible, but some tests are broken. I am now on Windows, where unit tests do not run. I will continue the development of flake as soon as I get access to my Linux laptop.

Fedora Workstation 31, AAC Support

  • Fedora Workstation 31 to come with Wayland support, improved core features of PipeWire, and more

    On Monday, Christian F.K. Schaller, Senior Manager for Desktop at Red Hat, shared a blog post that outlined the various improvements and features coming in Fedora Workstation 31. These include Wayland improvements, more PipeWire functionality, continued improvements around Flatpak, Fleet Commander, and more.

  • Fedora's AAC Support Finally Seeing Audio Quality Improvements

    Fedora's version of the FDK-AAC library that they began shipping in 2017 to finally provide AAC audio support strips out what was patented encumbered functionality. But that gutting of the code did cause some problems like audio playback glitches that are now being addressed. Fortunately, better AAC support is on the way to Fedora. There is this F30 update pending to provide an updated AAC implementation with quality enhancements.

Mozilla: Firefox's Gecko Media Plugin & EME Architecture, Accessibility, Firefox 68 Beta 10 Testday Results

  • Chris Pearce: Firefox's Gecko Media Plugin & EME Architecture

    For rendering audio and video Firefox typically uses either the operating system's audio/video codecs or bundled software codec libraries, but for DRM video playback (like Netflix, Amazon Prime Video, and the like) and WebRTC video calls using baseline H.264 video, Firefox relies on Gecko Media Plugins, or GMPs for short. This blog post describes the architecture of the Gecko Media Plugin system in Firefox, and the major class/objects involved, as it looked in June 2019. For DRM video Firefox relies upon Google's Widevine Content Decryption Module, a dynamic shared library downloaded at runtime. Although this plugin doesn't conform to the GMP ABI, we provide an adapter to allow it to be run through the GMP system. We use the same Widevine CDM plugin that Chrome uses. For decode and encode of H.264 streams for WebRTC, Firefox uses OpenH264, which is provided by Cisco. This plugin implements the GMP ABI.

  • Hacks.Mozilla.Org: How accessibility trees inform assistive tech

    The web is accessible by default. It was designed with features to make accessibility possible, and these have been part of the platform pretty much from the beginning. In recent times, inspectable accessibility trees have made it easier to see how things work in practice. In this post we’ll look at how “good” client-side code (HTML, CSS and JavaScript) improves the experience of users of assistive technologies, and how we can use accessibility trees to help verify our work on the user experience.

  • QMO: Firefox 68 Beta 10 Testday Results

    As you may already know, Friday June 14th – we held a new Testday event, for Firefox 68 Beta 10.