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MergeSort Algorithm in Ruby

When learning about sorting algorithms, I wanted to implement them to help me understand them better. This algorithm was originally invented by John von Neumann in 1948.

The Ruby script attached explains in real code what is going on. Play about with it.

How does the algorithm work?

Step by step:

Pass through an array of unsorted numbers (i.e. [4, 3, 2, 10])

WebM to MP4 using FFmpeg

This FFmpeg command converts a .webm video file to a standard .mp4 file using the libx264 codec for video, aac codec for audio, and a CRF value of 22. The preset is set to 'slow' for higher quality encoding, and the audio bitrate is set to 128 kbps.

If the input and output filenames don't contain spaces, quotation marks or other special characters:

ffmpeg -i input.webm -c:v libx264 -preset slow -crf 22 -c:a aac -b:a 128k output.mp4

	#!/usr/bin/env nix-shell
	#! nix-shell -i python3 -p python3.pkgs.dbus-python

	import dbus
	import time
	bus = dbus.SessionBus()
	obj = bus.get_object("org.gnome.Shell", "/org/gnome/Shell/Screencast")

	obj.Screencast("Auto %d %t.webm", [],
	dbus_interface="org.gnome.Shell.Screencast")