dalan dalanmiller

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

This guide is unmaintained and was created for a specific workshop in 2017. It remains as a legacy reference. Use at your own risk.

Running your own encrypted chat service with Matrix and Riot

Workshop Instructor:

Lilly Ryan @attacus_au

This workshop is distributed under a CC BY-SA 4.0 license.

What are we doing here?

Useful Pandas Snippets

A personal diary of DataFrame munging over the years.

Data Types and Conversion

Convert Series datatype to numeric (will error if column has non-numeric values)
(h/t @makmanalp)

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!

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Start your rethinkdb instance with this flag: --bind all (or bind=all in the configuration file for your instance)

Block external access to the web UI with these two commands: sudo iptables -A INPUT -i eth0 -p tcp --dport 8080 -j DROP sudo iptables -I INPUT -i eth0 -s 127.0.0.1 -p tcp --dport 8080 -j ACCEPT

Install nginx: sudo apt-get install nginx

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

	#!/bin/bash
	# https://developer.twitter.com/en/docs/twitter-api/v1/media/upload-media/uploading-media/media-best-practices
	# - h.264 high profile
	# - 60fps or less
	# - aac-lc, he-aac not supported
	# - 16:9 recommended
	# - 512mb maximum
	# - shorter than 140s
	# - 1:1 pixel aspect ratio
	# - yuv 4:2:0

	storage:
	dbPath: "/ssd/db/wt_zlib"
	engine: "wiredTiger"
	wiredTiger:
	collectionConfig: "block_compressor=zlib"
	systemLog:
	destination: file
	path: "/data/wt_zlib/mongodb.log"
	processManagement:
	fork: true

	import random
	from collections import defaultdict

	from pprint import pprint

	class City(object):
	def __init__(self, data=None):
	self.name = None
	self.neighbors = {}
	if data is not None:

	# Rails Stuff
	alias stoprails='kill -9 $(lsof -i :3000 -t)'
	alias startrails='rails server -d'
	alias restartrails='stopRails && startRails'

	#Check PHP For Erroes
	alias phpcheck='find ./ -name \*.php \| xargs -n 1 php -l'

	# ROT13-encode text. Works for decoding, too! ;)
	alias rot13='tr a-zA-Z n-za-mN-ZA-M'