Converting multiple video files recursively and in parallel on linux - Using ffmpeg and parallel

After starting using linux for gaming instead of windows, i needed to bring my games to linux, including clone hero. Most things worked flawlessly but some video background didn't. After searching, i found that linux clone hero backgroud videos should be webm, and some of mine where in mp4. 

After looking for some answers, i did find one here. 

There's one in particular where you can convert files parralelly, which is pretty cool.

Install ffmpeg and parallel using:

sudo apt install ffmpeg parralel


Then, you can run this in terminal after you navigated to the folder you want to convert the files. It uses find, so it runs recursively:

find -type f -name '*.mp4' -not -empty -print0 |
    parallel -0 -j -1 ffmpeg -loglevel fatal -i {} {.}.webm 

Hope it helps!

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Adaptador WIFI USB wn723n não funcionando corretamente no linux

Ao utilizar o adaptador de wifi usb da tp link wn723n no meu zorin os 15 e 16, baseados no ubuntu 18.04 e 20.04, notei que a conexão era instável e lenta. Assim como no Windows 7, o ubuntu instala um driver da versão americana automaticamente (v1 e v2) ao invés da versão brasileira/europeia (v3). 

 Para resolver este problema, instale o git caso não o tenha, e no terminal, clone o diretório de clnhub deste endereço com o comando: 

git clone https://github.com/clnhub/rtl8192eu-linux  

e entre no diretório com:

cd rtl8192eu-linux   

 Execute o instalador com:

sudo ./install_wifi.sh

 Reinicie o sistema e verifique em se o driver instalado é a versão r8188 com o comando: 

sudo lshw -c network  

 Caso não seja, remova a versão reportada com o comando:

sudo modprobe -r -v r8169 

 

onde r8169 é a versão que aparece no comando. 

 Atualize o cache com:

 sudo update-initramfs -u 

 e reinicie o computador.

 

 

    Por fim, o driver reportado deve ser o da imagem, e o seu adaptador wifi usb deve estar funcionando corretamente. 

   

 Os arquivos utilizados aqui podem ser baixados aqui, assim como estavam em outubro de 2021 e uma outra versão do tutorial em inglês de onde este foi baseado pode ser encontrada aqui.

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Install Epson Printer Driver on Linux

After trying to print multiple copies of a page using linux on my epson l575 printer, i noticed that only the first page was printed, and sometimes with a white page on the beggining. Eventough Linux-based distros usually installs a network printer automatically, there are some options that are not available on the auto-installed driver. To manually install the driver, you can look into the epson support page for the driver files. 

Look for your printer

Download the version for your system

After downloading the .tar.gz driver files, you can look in the ppd folder for your printer ppd file, extracting it with your compacted files manager, copy it to somewhere. 

Example: Extract the file “epson-inkjet-printer-escpr-1.7.17-1lsb3.2.tar.gz” and look for "ppd > Epson-L575_Series-epson-escpr-en.ppd” file for the L575 printer.

You can as well download my files created in sep/21 for amd64 system here. 

Add the printer if your system haven't done automatically, and in the printer details settings choose the ppd file that you extracted previously.

You can use this in any linux based system. 

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Open your applications menu from the dock on linux

After installing Ubuntu Mate and customizing it with some themes, icons and a dock (Plank), i realized that i couldn't access the applications menu (Brisk) neither find a easy tutorial for doing it, so these are the steeps i did for getting it. First you'll need "xdotool", you can install it in Ubuntu based distros on terminal with:

sudo apt install xdotool

Create your .desktop entry in /usr/share/applications. With nano you can run the command below to create the file on the correct place:

sudo nano /usr/share/applications/menu.desktop

Edit the below entry parts that suits your computer configuration, like the menu, the key command and the icon and paste in the nano terminal you opened before.

[Desktop Entry]
Encoding=UTF-8
Name=menu
Comment=menu
X-GNOME-FullName=Brisk Menu
Exec=xdotool key super      
Terminal=false
X-MultipleArgs=false
Type=Application
Icon=/usr/share/icons/Numix-Circle/48/apps/atomic_menu.svg 
Categories=Menu;
MimeType=
StartupNotify=true

Use Ctrl + O to save and Ctrl + X to exit.

 

Create your plank dock entry in ~/.config/plank/dock1/launchers/, you can use nano and run:

nano ~/.config/plank/dock1/launchers/menu.dockitem

and copy/paste the entry:

[PlankItemsDockItemPreferences]
Launcher=file:///usr/share/applications/menu.desktop

If you're usint tint2 you can add with: 

launcher_item_app = /usr/share/applications/menu.desktop

Font: https://forums.bunsenlabs.org/viewtopic.php?id=247

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Install latest version of java on linux (JDK and JRE) easily

After looking for the latest version of java to install on my linux system (Java 17 when i'm writting this), i found a really interesting tool to install any version of java available for linux with no harassment, that is SDKMan installer.

 First download and install SKDMan with the commands on terminal:

curl -s "https://get.sdkman.io" | bash

source "$HOME/.sdkman/bin/sdkman-init.sh" 

 You can check your installation with:

sdk version

You can see more options in SDKMan site, but in this tutorial we'll install java openjdk. Run the next command to see the availlable versions.

sdk list java

 You should see something like:

Use sdk install java x.y.z-open with your choosen version. In my case: 

sdk install java 17.ea.17-open

That's it, your PATH directory is already set and you can use your java command already.

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Video playback slow and lagging on Linux (Solus OS)

After installing solus and trying to playback some 720p and 1080p videos i noticed that the videos were lagging and stuttering really badly in vlc, gnome mpv and other players. Doing some research i didn't found the exactly answer but i found  that running vlc on terminal might show the problem. Reading the errors i saw that there was a libva error showing up and looking for "libva" on Solus software center i found that libva-intel-driver was missing, so i installed it and also libva-32bit library just in case.

And sure enough, the videos are now running smoothly.

So, to solve this problem you can try installing the libva library specific to your system, it worked for me.

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Manjaro (Arch Linux) doesn't recognize 3.0 USB devices. How to Solve?

After a kernel update in my manjaro deepin, my USB 3.0 external storage device stopped working, only working in a 2.0 USB. This is related with the idle discovery configuration in tlp, i really don't know why but here's how to solve it.

Connect your device and run the command lsusb in terminal to list the usb devices. Copy your device ID.

Save your device ID somewhere

Open tlp configuration with your prefered text editor, in this example i'll use gedit. Run in terminal:

sudo gedit /etc/default/tlp

Add the line with your device ID like:

USB_BLACKLIST="YOURDEVICEID"

In my case:

Reboot your PC and your device should be properly working.

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Force update Kubuntu and KDE Neon to the newest Plasma

This was originally to the 5.13 plasma, but it will update to the latest version whatever it is.

Plasma 5.13 brought a lot of innovations, including transparent in-program background.

To force the latest update in ubuntu based distros like KDE Neon/ Kubuntu you just have to add the KDE ppa to unstable releases. Remember that this can broke your system, so be carefull.

Use this command to add the ppa:

sudo apt-add-repository ppa:kubuntu-ci/unstable

Update your repo and upgrade your packages:

sudo apt update && sudo apt upgrade

I also recommend you to also install the ppa purge to remove the ppa if it's needed.

sudo apt install ppa-purge



If you want to remove the ppa run:

sudo ppa-purge ppa:kubuntu-ci/unstable

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Fix KDE Plasma no touchpad Settings (Unchangeable Gray options) on Ubuntu And Arch Linux Based distros

After fresh installing the system, the touchpad settings aren’t available for adjusting, all the options are gray. i’ve noticed that in Kubuntu and manjaro, so probably can happen in KDE Neon also. This is a bug in the touchpad driver integration with system, so to solve you just have to install another touchpad driver.

In a Debian-based distro use the next command for searching for drivers:

apt-cache search synaptics

This is the driver that worked better on my pc, but you can try any of these.

In Arch-based distros you can use yaourt or pacaur to search for it.

Copy the package name and use the command:

sudo apt install 

and paste the package name. in my case:

sudo apt install xserver-xorg-input-synaptics

Hit enter, input your password and confirm the installation.

After the installation finishes, reboot your system and that’s it. your touchpad should work properly.

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