Installing Membrane Server on Raspbian using the debian package
Get the debian package
Download the debian package file for your desired type of Membrane Server, named with a "deb" extension.
Install the debian package
Find the downloaded deb file and right-click it to show a list of actions. Choose "Package Install" to activate the installation process.
Raspberry Pi OS asks if you want to install this file. Click "Install" to continue.
Raspberry Pi OS asks for authentication to install untrusted software. Enter your password to finish the installation process. Note that the default password for the pi user is "raspberry".
If desired, Membrane Server can also be installed by command-line. Open Terminal using the Raspberry Pi OS desktop's toolbar and execute a dpkg command such as:
sudo dpkg -i membrane-monitor_1-1_armhf.deb