yordanoweb / flutter_proj_no_android_studio.md

Last active February 23, 2025 16:20

Create Flutter project without Android Studio in ArchLinux

Flutter without Android Studio

Install packages

sudo pacman -S flutter dart kotlin android-sdk android-sdk-platform-tools android-sdk-build-tools \
               android-platform android-sdk-cmdline-tools-latest jdk17-openjdk

Note: The required JDK must be higher than 11.

yordanoweb / squid_https_cached.md

Last active January 13, 2025 19:59

Squid Cache configuration for caching HTTPS

Squid with HTTPS caching

##################################################################################################################
# openssl req -new -newkey rsa:2048 -sha256 -days 365 -nodes -x509 -extensions v3_ca -keyout squid-ca-key.pem -out squid-ca-cert.pem
# cat squid-ca-cert.pem squid-ca-key.pem >> squid-ca-cert-key.pem
# sudo mkdir /etc/squid/certs
# sudo mv squid-ca-cert-key.pem /etc/squid/certs/
# sudo chown proxy:proxy -R /etc/squid/certs
# sudo /usr/lib/squid/security_file_certgen -c -s /var/cache/squid/ssl_db -M16MB

yordanoweb / hdmi_handling.md

Last active August 19, 2022 23:34

Activate and deactivate HDMI in Linux manually

HDMI handling in Linux

HDMI1 output to right screen

xrandr --output HDMI1 --mode 1366x768 --right-of eDP1

Deactivate right HDM1 output screen

yordanoweb / fix_libnss3_firefox_error.md

Last active July 7, 2022 21:26

Fix NSS error after upgrade Firefox in ArchLinux

Error after upgrading Firefox in ArchLinux:

XPCOMGlueLoad error for file /usr/lib/firefox/libxul.so:
/usr/lib/libnss3.so: version `NSS_3.79' not found (required by /usr/lib/firefox/libxul.so)
Couldn't load XPCOM.

Updated the next following packages:

yordanoweb / bspwm_ubuntu.md

Last active February 23, 2025 16:20

Trying to replicate ArchCraft visuals on Ubuntu 20.04

BSPWM in Ubuntu

Install required packages

sudo apt install bspwm rofi dunst vim ranger htop compton feh xclip install xfce4-settings \
 xsettingsd pavucontrol ncmpcpp mpd

Copy .Xresources, BSPWM, Rofi and Sxhkd configs

yordanoweb / gnome-control-center.md

Created July 13, 2022 12:46

Resolve issues with gnome-control-center

Segmentation fault after some config change

I had this issue:

~$ gnome-control-center

(gnome-control-center:3317): Gdk-WARNING **: 08:37:28.693: Cannot transform xsetting gtk-xft-dpi of type gchararray to type gint
(gnome-control-center:3317): Gdk-WARNING **: 08:37:28.701: Cannot transform xsetting gtk-xft-dpi of type gchararray to type gint
(gnome-control-center:3317): Gdk-WARNING **: 08:37:29.409: Cannot transform xsetting gtk-xft-dpi of type gchararray to type gint

yordanoweb / gpg_encrypt_decrypt.md

Last active February 23, 2025 16:18

Encrypt and decrypt file using GPG (password protected)

Encrypt and Decrypt

Encrypt

gpg -o output-file.asc --armor --symmetric --cipher-algo AES256 input-file.txt

Decrypt

yordanoweb / mencoder-ass-subtitles.md

Last active February 23, 2025 16:22

Encode videos with mencoder and subtitles format (font size, color and more...)

Encode with mencoder and ASS subtitles

Note the -ass-force-style and the -ass parameters...
Also, note the extension of the subtitles file is a .srt file
The rest of the options are for video encoder, video format, size, bitrate, etc... In this example we encode to AVI XVID with MP3 audio.

nice -n 10 /usr/bin/mencoder "/home/john/Videos/Red.mp4" -o "/home/john/Videos/Red.avi" \
   -ass-force-style "FontSize=32,PrimaryColour=&H00ffff,Bold=1,MarginV=24" \
 -ass /home/john/Videos/Red.srt -ofps 24 -vf softskip,scale=700:300:0,harddup \

yordanoweb / tcpdump-filters.md

Last active August 8, 2022 12:40

Capture outgoing connections and HTTP GET/POST requests

tcpdump -i wlan0 -w /tmp/wlan0.pcap -C 50 -A -n -K '(tcp[tcpflags] & (tcp-syn) != 0) \
        or ((tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x47455420) and less 1024) \
        or ((tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x504F5354) and less 1024)' &

Notes

yordanoweb / ffmpeg-subs-color-join-and-more.md

Last active March 13, 2025 18:17

Encode with ffmpeg using formatted subtitles

Encode, join, and more, with ffmpeg with subtitles

ffmpeg -i bullet.train.mp4 \
       -f segment -segment_time 00:55:00 -reset_timestamps 1 \
       -c:v mpeg2video -c:a mp2 -b:v 2500k -b:a 128k -s 700x300 -af volume=8.0 \
       -vf "subtitles=filename=bullet.train.srt:force_style='FontSize=26,PrimaryColour=&h00ffff,Bold=1,Shadow=3'" \
       -y bullet.train.%02d.mpg

Yordano Pascual Rivera yordanoweb