Omer Shapira

Etherwave Affair: Playing music from youtube on a Raspberry Pi

Posted by Omer

09 Mar 2013 — No Comments

Last September, I boarded a plane from Tel Aviv to New York to start a new big period in my life. I was about to begin studying at NYU’s Interactive Telecommunications Program, a master’s program in art and technology. The engine hum turned into a roar, gravity shifted to my back. My girlfriend held me tight and we were airborne. A month later, she took a flight back to Tel Aviv to finish her own degree in Architecture.

Being two busy students/artists makes it hard enough to see eachother, being 7 timezones away makes it impossible. When we’re together, we try as hard as we can to distract eachother. There’s always too much work, until someone has enough and sneaks something new onto the stereo. Then we dance.

Listening to music together is something as fundamental to us as touching eachother. There was no way around it, I had to find a way to do that again.

When I was visiting Tel Aviv a that winter, I saw how much things changed. Our apartment was now shared, our stuff heavily permuted, also – my raspberry pi finally arrived in the mail.

I took this opportunity to make a device that creates that shared space between us. I connected the Pi to the T-Amp in the room, installed raspbian, defined the proper port forwarding for communications outside the local network, and started installing some stuff.

I started by setting up shairport , an AirTunes server for her to use, using this tutorial by Eric Trouch . It worked pretty well, so I’m sharing my steps:

For the current version, you’ll need mplayer, ffmpeg and youtube-dl: sudo apt-get install ffmpeg mplayer youtube-dl.

Create your script file. I call mine yt, so I typed sudo nano yt. This opens the nano text editor. Into it, paste the following piece of code:

mplayer -vo null -cookies -cookies-file /tmp/cookie.txt $(youtube-dl -g -f 34 –cookies /tmp/cookie.txt “$1”)

One line. That’s it. Now make it runnable:

sudo chmod +a+x yt

That’s what I did. And then, from an apartment in Williamsburg, I typed this to a computer in Tel Aviv:

./yt http://www.youtube.com/watch?v=FIPQVpw-zkk

A minute later I got a response.

It works. We can make it through a few more weeks.

Oscillations [Processing.js]

Posted by Omer

05 Mar 2013 — No Comments

Posted in Works

Tagged: Javascript, Mathematics, Oscillations, Processing, Processing.js

Oscillations (click for fullscreen) is something I wrote in processing.js. It’s an experiment in iterated linear interpolations of trigonometric functions.

Controls:

The mouse controls the sampling frequency
The up/down keys control the frequency multiplier
The left/right keys control the y phase.

Line Permutation Camera

Posted by Omer

03 Mar 2013 — No Comments

Posted in ITP

Tagged: Glitch, Line Permutation Camera, Processing, Software, Video Art

This is a little thing I’ve been working on for James George’s class. It’s a sketch that evolves a 2D image sequence from a single video line. Right now it uses some form of averaging, but soon I’ll write a 1D cellular automaton to make it more interesting. Here are some results.

Here’s the code:

/**
 *  Type 1,2 for different 'flame' modes
 *	type 'c' to turn clipping on/off
 *	@author Omer Shapira
 */

import processing.video.*;

Capture video;
PImage img;
boolean clip = true;
int type = 0;

void setup(){
  size(640, 480);
  video = new Capture(this);
  video.start();
  img = createImage(640,480, RGB);
  img.loadPixels();
}

void draw(){
  update();
  image(img,0,0);
}

void update(){
  if (video.available() == true) {
    video.read();
    video.loadPixels();

    int ix,iy;
    for (int i = width*height-1; i>=0; i--){
      ix = i%width;
      iy = i/width;
      if (iy >= height-2){
        img.pixels[i] = video.pixels[i];
        } else {
        	switch (type){
        		case 0 :
        			img.pixels[i] = averageColors(clip, img.pixels[i+width - 1], img.pixels[i+width] ,(ix==width-1? img.pixels[i+width - 1] : img.pixels[i+width + 1]), img.pixels[i+width*2]);
        		break;	
        		case 1 :
        			img.pixels[i] = averageColors(clip, img.pixels[i], img.pixels[i+width]);		
        		break;	

        	}
      }
  }
  img.updatePixels();
}
}

int averageColors(boolean clip, color... colors){
  float tempfloat = 0;
  int tempColor = 0;

  for (int i = 0; i<4; i++){
    int range = 255<<(8*i);
    for (color c : colors){
          tempfloat += (c&range);
      }

    tempfloat /= (float) colors.length;
    tempColor += (!clip ? int(tempfloat) : int(tempfloat)&range);
    tempfloat = 0;
    }
return tempColor;
}

void keyTyped(){
	if (key < '9' && key > '0'){
	type = int(key)%2;	
	} else if (key=='c') {
		clip = !clip;
	}
}

P5 Texture Map – A Projection Mapping addon for Processing 2.0

Posted by Omer

28 Feb 2013 — No Comments

Posted in Works

Tagged: Addons, Inverse Kaleidoscope, Libraries, Plugins, Processing, Projection Mapping, Software

I released the code I used to projection-map my Inverse Kaleidoscope (documentation coming soon). P5 Texture Map is a projection mapping addon I wrote for the project. It only uses Java and Processing (no external OpenGL libraries). Version 0.1 is now available on GitHub.

Video Haiku – Mountains

Posted by Omer

22 Feb 2013 — 1 Comment

Posted in ITP, Works

Tagged: Pixel Sort, Video Art

This is my first assignment for James George’s class, Emerging Processes in Video Art. The pixel sorting program was written by me. It runs in real time.

Spacebrew Tutorial 2: Chatting, Setting up a Spacebrew server on Amazon EC2

Posted by Omer

20 Feb 2013 — No Comments

Posted in ITP

Tagged: Ryan Bartley, Spacebrew, Spatial Media, Tutorials

This week, Ryan Bartley and I set out to Brad’s at NYU. We set up a node.js server on an Amazon EC2 instance, ran spacebrew on it, and wrote a little chat program to communicate. We also had too many beers. Enjoy.

Spacebrew Tutorial 1: Hosting node.js on your laptop, in a pub

Posted by Omer

13 Feb 2013 — No Comments

Posted in ITP

Tagged: NodeJS, Ryan Bartley, Spacebrew, Spatial Media, Spike Hill, Tutorials

This week, Ryan Bartley and I started making spacebrew tutorials in pubs. The first installment discusses starting a spacebrew server on your own computer, using WiFi you stole at Spike Hill, Williamsburg.

ForceField Update #2

Posted by Omer

26 Jan 2012 — 1 Comment

Posted in Works

ForceField has now been updated to allow better modeling, higher depth resolution, and better calibration. Oh yeah, and it now plays sounds.

Here are some changes:

Screen Modeling: Instead of using inverse bilinear interpolation, we now use 3D rotation matrices, multiplied by stretch matrices.
Hand Recognition using OpenCV
MIDI using the processing library, The Midi Bus

ForceField update #1

Posted by Omer

29 Dec 2011 — No Comments

Posted in Works

Tagged: Installations, Kinect, Processing, Projection, Software

Kinect, Processing, Projector, bridal veil.

This is a project I’ve been working on with Ohad Ron: an audiovisual feedback system to gestures. It uses spatial segmentation with readings from Kinect and some Computer Vision, and outputs to MIDI.

Here’s a demo:

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