Alexander O aleohl

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

The Setup

This is a docker-compose file for a simple, secure torrent setup. It includes [rTorrent] (a torrent client), [flood] (a web interface for rTorrent), [OpenVPN] (to tunnel traffic through your ISP) and a simple iptables firewall to allow rTorrent to only access the internet through a VPN.

To run everything, put your open vpn configuration file in ./vpn.ovpn and the other configuration files from this gist in a directory then go to that

Controlling the Brother P-Touch Cube label maker from a computer

The Brother PTP300BT label maker is intended to be controlled using the official Brother P-Touch Design & Print iOS/Android app. The app has arbitrary limits on what you can print (1 text object and up to 3 preset icons), so I thought it would be a fun challenge to reverse engineer the protocol to print whatever I wanted.

Python code at the bottom if you want to skip the fine details.

Process

Intitially I had a quick peek at the Android APK to see if there was any useful information inside. The code that handles the communication with the printer in Print&Design turned out to be a native library, but the app clearly prepares a bitmap image and passes it to this native library for printing. Bitmaps are definitely something we can work with.

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

	#!/bin/bash

	# curl -sL https://gist.githubusercontent.com/RichardBronosky/31660eb4b0f0ba5e673b9bc3c9148a70/raw/touchid_sudo.sh \| bash
	# This script is ready to copy-paste in whole, or just the line above (without the leading #)

	# Use TouchID for sudo on modern MacBook Pro machines
	# This script adds a single line to the top of the PAM configuration for sudo
	# See: https://apple.stackexchange.com/q/259093/41827 for more info.

	touchid_sudo(){

	<!DOCTYPE html>
	<html lang="en" xmlns="http://www.w3.org/1999/xhtml" dir="ltr" class="uk-height-1-1">
	<head>
	<meta charset="utf-8" />
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title>flasktest</title>
	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bulma/0.7.1/css/bulma.min.css" />
	<script defer src="https://use.fontawesome.com/releases/v5.3.1/js/all.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
	</head>

	#!/bin/bash
	iatest=$(expr index "$-" i)

	#######################################################
	# SOURCED ALIAS'S AND SCRIPTS BY zachbrowne.me
	#######################################################

	# Source global definitions
	if [ -f /etc/bashrc ]; then
	. /etc/bashrc

	# this assumes WAN is eth0 and LAN is switch0. Please adjust for your own setup

	configure

	# Tunnel first
	edit interfaces tunnel tun0
	set encapsulation sit
	set local-ip xxx.xxx.xxx.xxx # your WAN IP
	set remote-ip xxx.xxx.xxx.xxx # HE.net Server IPv4 Address
	set address xxxx:xxxx:xxxx:xxxx::2/64 # Client IPv6 Address

	#!/usr/bin/env python

	"""
	2020 update:
	- More iterators, fewer lists
	- Python 3 compatible
	- Processes files in parallel
	(one thread per CPU, but that's not really how it works)
	"""