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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Como baixar um site inteiro com sublinks / subpastas automaticamente

Ao pesquisar por sites antigos para um projeto, me vi na necessidade de salvar um específico para acesso offline/arquivamento, pois aquele conteúdo não estava mais disponível em outros locais para fácil acesso e o site poderia sair do ar a qualquer momento. Ao pesquisar, vi o Wget como boa alternativa, mas também encontrei o HTTrack, que faz isso, tem GUI prática e ainda organiza as paginas salvas. 

Você pode baixa-lo em www.httrack.com ou usar essa cópia que salvei assim como estava em março de 2022: 

Download (Newest Version)

Download (Archived old version)

 

Instruções de uso

Na tela inicial, avance e insira um nome para seu projeto.

Insira o endereço web e avance. Por fim Concluir 

 

Agora é só aguardar. O processo pode demorar um pouco dependendo do tamanho da página, mas no fim você terá todos os links e sublinks de uma pagina salvas em "C:\My Web Sites" por padrão. O site será totalmente navegável para uso offline completo, além de arquivamento local, basta abrir o arquivo index.html.

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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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Renaming invalid variables on Stata

After exporting an R database to Stata, the variables were like below, with "." in their names. 

Trying to rename them, resulted on the error: 

You used . in oldname, not newname. . is used in newname to indicate that the corresponding wildcard in oldname be skipped. E.g., "rename a*b* a.b*" removes what is between a and b; variable ausbvalue would be renamed abvalue. 

After searching for a solution, i found one here To rename the variables to a valid name you can just use the code below to fix the var names.

forvalues i = 1/`c(k)' {

    qui mata: st_isname(st_varname(`i')) ? 1 : st_varrename(`i', ustrtoname(st_varname(`i'))) 

}

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