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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.

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

	#####
	# 1. Make sure the link, http://www.yourdomain.com/.well-known/acme-challenge/, works.
	************************************************
	* For apache httpd, add below to httpd.conf
	*************************************************

	# Let's encrypt folder
	Alias "/.well-known/acme-challenge" "/letsencrypt/acme-challenge"
	<Directory "/letsencrypt/acme-challenge">
	Options Indexes

	#!/bin/bash

	## Install cerbot, which can automatically generate, renew and deploying Let's Encrypt certificates.
	sudo apt-get update
	sudo apt-get install software-properties-common
	sudo add-apt-repository ppa:certbot/certbot
	sudo apt-get update
	sudo apt-get install certbot

	## NOTE: Before proceeding with this step, ensure that your domain name points to the public IP address of the Bitnami application host.

	# From: https://devcenter.heroku.com/articles/ssl-certificate-self
	openssl genrsa -des3 -passout pass:x -out server.pass.key 2048
	openssl rsa -passin pass:x -in server.pass.key -out server.key
	rm server.pass.key
	openssl req -new -key server.key -out server.csr
	// Common Name (e.g. server FQDN or YOUR name) []:localhost
	openssl x509 -req -sha256 -days 365 -in server.csr -signkey server.key -out server.crt

	for f in `ls`
	do
	xxd -l 16 $f > xxd_result
	if grep -q Exif xxd_result; then
	echo $f.jpg
	mv $f $f.jpg
	else
	if grep -q ftypqt xxd_result; then
	echo $f.mov
	mv $f $f.mov

	sudo apt-get install nginx

	WEB_ROOT=/var/www/html
	sudo rm -f ${WEB_ROOT}/*.m3u8
	sudo rm -f ${WEB_ROOT}/*.ts

	gst_pid=`ps -A \| grep gst-launch-1. \| awk '{print $1}'`
	sudo kill -9 ${gst_pid}

	sudo gst-launch-1.0 videotestsrc is-live=true ! clockoverlay shaded-background="true" font-desc="Sans, 24" \

	## Get current user's avatar.
	export USER_HOME=~
	dscl . -read $USER_HOME JPEGPhoto \| tail -1 \| xxd -r -p > ~/Desktop/avatar.jpg

	sudo apt-get install -y build-essential libtool autotools-dev automake
	sudo apt-get install -y libsoup2.4-dev libjson-glib-dev libssl-dev autopoint gtk-doc-tools libgstreamer1.0-dev

	sudo apt-get install -y gstreamer1.0-tools gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly

	gst-inspect-1.0 videotestsrc
	gst-inspect-1.0 decodebin

	gst-launch-1.0 filesrc location=test.mp4 ! decodebin ! fakesink

	# will generate playlist.m3u8 and segment[nnnnn].ts live in current folder,
	# server these files by HTTP server will get the hls stream.
	gst-launch-1.0 videotestsrc is-live=true ! x264enc ! mpegtsmux ! hlssink