orange888

FFmpeg cheat sheet

A list of useful commands for the ffmpeg command line tool.

Download FFmpeg: https://www.ffmpeg.org/download.html

Full documentation: https://www.ffmpeg.org/ffmpeg.html

Basic conversion

Asynchronous Programming and Microservices: Comparing Javascript, Erlang and Python with RabbitMQ + Celery

This article is about building asynchronous microservices. I'll compare how this can be achieved in Javascript and Erlang natively, and in Python using RabbitMQ and Celery.

But why?

My first encounter with asynchronous programming in python was when building a web backend. Upon completing a purchase, the user should eventually receive a PDF invoice by email. This didn't have to happen immediately during the request; in fact, it was better if it didn't, so as not to slow down the purchase needlessly. At the time I wasn't sure how to implement an asynchronous workflow in python, but a quick google search quickly lead me to Celery and RabbitMQ. Celery is very easy to use; the only pain is setting up a message broker -- RabbitMQ, in my case. Once you're set up, running a task in the background is as easy as writing, in myapp.py,

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

LUKS crypt

In this guide, I'm going to setup a keyfile-encrypted LUKS partition. I will be using a single, max-size partition on a single physical device. My physical device is located at /dev/sde

partition the physical device

parted /dev/sde

	#!/usr/bin/env bash

	# https://docs.docker.com/install/linux/docker-ce/ubuntu/
	sudo apt-get install apt-transport-https ca-certificates curl software-properties-common
	curl -fsSL https://download.docker.com/linux/ubuntu/gpg \| sudo apt-key add -
	sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable"
	sudo apt-get update
	sudo apt-get install docker-ce

	# https://docs.docker.com/compose/install/

	# Instructions
	# 1. Update your /etc/hosts file...
	# > 127.0.0.1 gitea drone
	# 2. Run gitea + gitea-db and generate the oauth application
	# > docker-compose -p gitea-drone up gitea gitea-db
	# - Navigate to http://gitea:3000 to finish the installation and register a user
	# - Create a oauth application as described here: https://docs.drone.io/installation/providers/gitea/
	# - Set the Redirect uri to http://drone:8000/login
	# 3. Update the docker-compose file with the client_id and client_secret
	# 4. Fire up all of the services

	#!/usr/bin/env python

	import os
	import sys
	import socket
	import time
	import multiprocessing
	from struct import *

	try:

	#!ipxe

	# To access this file via http use following redirection:
	# http://preseed.panticz.de/ipxe/menu.livecd.ipxe

	menu LiveCD
	item --gap Ubuntu:
	item live_ubuntu_16.04 Ubuntu Trusty 16.04 LiveCD
	item live_ubuntu_14.04 Ubuntu Trusty 14.04 LiveCD
	item live_ubuntu_12.04 Ubuntu Precise 12.04 LiveCD

	#!/usr/bin/env python
	# -- coding: utf-8 --
	#
	# This is how I used it:
	# $ cat ~/.bash_history \| python bash-to-zsh-hist.py >> ~/.zsh_history

	import sys
	import time

	:80 {
	root /serve
	}