Craig Atallah Frost craigthomasfrost

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

Neo4j Tutorial

Fundamentals

Store any kind of data using the following graph concepts:

Node: Graph data records
Relationship: Connect nodes (has direction and a type)
Property: Stores data in key-value pair in nodes and relationships
Label: Groups nodes and relationships (optional)

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

Postgres Cheatsheet

This is a collection of the most common commands I run while administering Postgres databases. The variables shown between the open and closed tags, "<" and ">", should be replaced with a name you choose. Postgres has multiple shortcut functions, starting with a forward slash, "". Any SQL command that is not a shortcut, must end with a semicolon, ";". You can use the keyboard UP and DOWN keys to scroll the history of previous commands you've run.

Setup

installation, Ubuntu

http://www.postgresql.org/download/linux/ubuntu/ https://help.ubuntu.com/community/PostgreSQL

	"""
	The most atomic way to train and run inference for a GPT in pure, dependency-free Python.
	This file is the complete algorithm.
	Everything else is just efficiency.

	@karpathy
	"""

	import os # os.path.exists
	import math # math.log, math.exp

	"""
	Script to create an image of a glyph in the current layer.

	Instructions:

	- Use within the Drawbot plugin of GlyphsApp.
	- Get this plugin via Window > Plugin Manager, then search for "Drawbot" and install it.
	- Then, go to File > New Drawbot, and paste in this code and run it.
	- You may need to restart glyphs for the Plugin to work.

	import SwiftUI
	import PlaygroundSupport

	// NOTE: this example currently only works with US-based coordinates

	// constants

	// New York
	let latitude = 40.709335
	let longitude = -73.956558

	import { ApolloServer, gql } from 'apollo-server-micro';

	const typeDefs = gql`
	type Query {
	sayHello: String
	}
	`;

	const resolvers = {
	Query: {

	{% comment %}
	*
	* This loop loops through a collection called `collection_name`
	* and sorts it by the front matter variable `date` and than filters
	* the collection with `reverse` in reverse order
	*
	* To make it work you first have to assign the data to a new string
	* called `sorted`.
	*
	{% endcomment %}