Bill McKessy billautomata

#code art festival - speaker information

Thank you for participating as a speaker in Code Art Festival. This is a not-for-profit festival created as an outgrowth of the PDX Creative Coders organization.

###where

The event is on July 25, 2015 at 1417 NW Everett St in Portland Oregon. (14th, and Everett in NW Portland).

###schedule

compile ffmpeg for arm https://github.com/fiorix/ffmpeg-arm
create youtube 'live event'. get rtmp url + session id
run this:

raspivid -o - -t 0 -vf -hf -fps 30 -b 6000000 | ffmpeg -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental -f flv rtmp://a.rtmp.youtube.com/live2/<SESSION>

you can tweak -b and -fps to your liking. the settings above work well for 1080p. by not specifying width or height we get the full 1920x1080 resolution from the raspi camera

Convert MOV to GIF using FFmpeg and ImageMagick

I tried a few different techniques to make a GIF via command-line and the following gives me the best control of quality and size. Once you're all setup, you'll be pumping out GIFs in no time!

Preparation

Install FFmpeg

$ brew install ffmpeg [all your options]
- Example: $ brew install ffmpeg --with-fdk-aac --with-ffplay --with-freetype --with-frei0r --with-libass --with-libvo-aacenc --with-libvorbis --with-libvpx --with-opencore-amr --with-openjpeg --with-opus --with-rtmpdump --with-schroedinger --with-speex --with-theora --with-tools

Install ImageMagick

	// usage
	// node reduce.js worldmap.geojson 3

	var fs = require('fs')

	var json_string = fs.readFileSync(process.argv[2])
	var precision = parseInt(process.argv[3])

	console.log('original length: ' + json_string.length)

	var http = require('http');
	http.createServer(function (req, resp) {
	var h = req.headers;
	h.host = "stackoverflow.com";
	var req2 = http.request({
	host: h.host, port: 80, path: req.url, method: req.method, headers: h
	}, function (resp2) {
	resp.writeHead(resp2.statusCode, resp2.headers);
	resp2.on('data', function (d) { resp.write(d); });
	resp2.on('end', function () { resp.end(); });

	#!/usr/bin/expect -f
	spawn openssl pkcs12 -export -in client.crt -inkey private.key -certfile ca.crt -name Evident-Dev -out clientcert.p12
	expect "assword:"
	send "\r\r"
	interact

	var rtlsdr = require('rtlsdr'); // require the module

	var freq = 91495300 // local NPR fm (91.49mhz)
	freq = 45495300 // random freq in Hz 45,495,300hz

	rtlsdr.getDevices(function (err, devices) {

	devices[0].open(function (err, device) {

	device.setSampleRate(2048000);

	# on host A
	# sudo pppd [options] myip:destip /dev/usb baudrate
	# sudo pppd proxyarp mtu 1280 persist nodeflate noauth lcp-echo-interval 10 crtscts lock HOST_A_IP:HOST_B_IP /dev/ttyusb baud_rate


	sudo pppd proxyarp mtu 1280 persist nodeflate noauth lcp-echo-interval 10 crtscts lock 10.10.1.2:10.10.1.1 /dev/ttyUSB0 57600

	# on host B
	sudo pppd proxyarp mtu 1280 persist nodeflate noauth lcp-echo-interval 10 crtscts lock 10.10.1.1:10.10.1.2 /dev/ttyUSB1 57600

	#!/bin/sh
	# install :
	# curl -o installer.sh https://gist.github.com/iNem0o/6346423/raw && chmod +x installer.sh && sudo ./installer.sh

	sudo apt-get update
	sudo apt-get --no-install-recommends -y install git cmake libusb-1.0-0-dev libpulse-dev libx11-dev screen qt4-qmake libtool autoconf automake libfftw3-dev

	mkdir ~/src

	echo "Installation de rtl_sdr"