billautomata

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

billautomata

1. compile ffmpeg for arm https://github.com/fiorix/ffmpeg-arm
2. create youtube 'live event'. get rtmp url + session id
3. 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

billautomata

#!/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"

billautomata

# 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

billautomata

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);

billautomata

ffmpeg -f image2 -r 24 -i %04d.png -vcodec libx264 -profile:v high444 -refs 16 -crf 0 -preset ultrafast a.mp4

billautomata

#!/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

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

billautomata

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(); });

billautomata

// 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)