Managing LVM Snapshots/ recording desktop on ubuntu / modified pnmixer volume slider for openbox tint2

 https://wiki.learnlinux.tv/index.php/Managing_LVM_Snapshots_on_Arch_Linux

ffmpeg -video_size 1366x768 -framerate 30 -f x11grab -i :0.0+0,0 -f pulse -ac 2 -i 0 -c:v libx264rgb -crf 0 -preset ultrafast sample.mkv 

to convert to mp4 - ffmpeg sample.mkv sample.mp4

to modify pnmixer yourself, install glade, download pnmixer from github -  https://github.com/nicklan/pnmixer

the glade GUI will help You modify it, otherwise You can download my modified version from - https://drive.google.com/file/d/1ob19nR7pZL2tfs_wDV3bQscn-WL3Y3Rv/view?usp=sharing

You will need libnotify-dev libasound2-dev

then follow guide - https://github.com/nicklan/pnmixer/blob/master/HACKING.md

After compiling pnmixer with glade,You copy binary and add script that uses files located on Downloads folder (where You stored unarchieve pnmixer-master)

echo -e '#!/bin/bash\ncd ~/Downloads/pnmixer-master/build/ && ./src/pnmixer && cd' | sudo tee /usr/bin/pmx && sudo chmod +x /usr/bin/pmx

create system wide shortcut -  sudo geany ~/.local/share/applications/pmx.desktop 

[Desktop Entry]

NotShowIn=Unity;GNOME;

Name=Files

Comment=Access and organize files

# Translators: Search terms to find this application. Do NOT translate or localize the semicolons! The list MUST also end with a semicolon!

Keywords=volume slider;

Exec=pmx

# Translators: Do NOT translate or transliterate this text (this is an icon file name)!

Icon=org.gnome.Nautilus

Terminal=false

Type=Application

StartupNotify=true

Categories=GNOME;GTK;Utility;Core;

X-GNOME-UsesNotifications=true

Actions=new-window;

X-Unity-IconBackgroundColor=#af4853

X-Ubuntu-Gettext-Domain=nautilus

X-AppStream-Ignore=true

[Desktop Action new-window]

Name=New Window

Exec=pmx

Add shortcut to Tint2 

sudo geany ~/.config/tint2/tint2rc 

 launcher_item_app = pmx.desktop

How to install openbox on ubuntu 18.04

sudo apt install openbox

 sudo apt install openbox-gnome-session 

sudo apt install xcompmgr 

sudo apt install gnome-screensaver

 sudo apt install obmenu

add apps with commands like pavucontrol, kill tint2, tint2 etc you want

 sudo apt install pavucontrol 

 sudo apt install tint2

sudo apt install feh

feh --bg-scale /home/ronalds/Pictures/pexels-photo-1260820.jpeg

 sudo geany /etc/xdg/openbox/autostart.sh 

add:

eval `cat $HOME/.fehbg` &

tint2 &

 sudo nautilus /usr/share/applications

 sudo geany ~/.local/share/applications/lockscg.desktop 

[Desktop Entry] Type=Application Name=lock screen Exec=gnome-screensaver-command -l 

sudo geany ~/.local/share/applications/show-desktop.desktop 

[Desktop Entry] Type=Application Name=Show Desktop Icon=desktop Exec=xdotool key --clearmodifiers Super+d 

sudo geany ~/.config/tint2/tint2rc 

add:

 launcher_item_app = show-desktop.desktop

 launcher_item_app = nautilus.desktop 

launcher_item_app = gnome-terminal.desktop

 launcher_item_app = pavucontrol.desktop

 launcher_item_app = google-chrome.desktop

 launcher_item_app = lockscg.desktop

DON't forget to switch off going to hibernation on closing the lid, in the gnome-desktop-environment, if You don't really like Your laptop doing that in Openbox session.