Processing Forum

How to interface with multiple webcams via USB hub

[0 Replies]
- 26-Apr-2013 11:48 AM
- Forum: Programming Questions
So i've been trying to get 4 webcams talking to processing through a usb hub, but i get a white screen for each webcam after the first one.

Below is the code im using, all the cams show up as available but don't give an image.
2. import processing.video.*;
4. Capture [] cam = new Capture[5];
6. void setup() {
7. size(640, 480, P2D);
9. String[] cameras = Capture.list();
10. if (cameras.length == 0) {
11. println("There are no cameras available for capture.");
13. exit();
14. }
15. else {
16. println("Available cameras:");
17. for (int i = 0; i < cameras.length; i++) {
18. println(i+" ");
19. println(cameras[i]);
20. }
21. cam[0] = new Capture(this, cameras[0]);
22. cam[0].start();
23. println("camera 1 ready " + cam[0]);
24. cam[1] = new Capture(this, cameras[30]);
25. cam[1].start();
26. println("camera 2 ready " + cam[1]);
27. cam[2] = new Capture(this, cameras[45]);
28. cam[2].start();
29. println("camera 3 ready " + cam[2]);
30. cam[3] = new Capture(this, cameras[60]);
31. cam[3].start();
32. println("camera 4 ready " + cam[3]);
34. }
35. }
37. void draw() {
38. int c = int(random(cam.length-1));
40. if (cam[c].available() == true) {
41. cam[c].read();
42. }
43. image(cam[c], width/4, height/4, width/2, height/2);
44. delay(1000);
45. }

Trying to switch automatically between webcams

[0 Replies]
- 20-Apr-2013 10:35 AM
- Forum: Core Library Questions
Im trying to write a processing script that will randomly cycle through a series of webcams, i can get the values to change of random but it doesn't seem to effect the camera changing. I'm a little stuck so any help is appreciated.
2. import processing.video.*;
4. Capture cam1;
5. Capture cam2;
7. void setup() {
8. size(1000, 1000);
10. String[] cameras = Capture.list();
12. if (cameras.length == 0) {
13. println("There are no cameras available for capture.");
14. exit();
15. } else {
16. println("Available cameras:");
17. for (int i = 0; i < cameras.length; i++) {
18. println(cameras[i]);
19. }
21. // The camera can be initialized directly using an
22. // element from the array returned by list():
23. cam1 = new Capture(this, cameras[6]);
24. println(cameras[3]);
26. cam2 = new Capture(this, cameras[18]);
27. println(cameras[18]);
29. }
30. }
32. void draw() {
33. if (cam1.available() == true) {
34. cam1.read();
35. }
36. if (cam2.available() == true) {
37. cam2.read();
38. }
40. image(cam1, 0, 0);
41. image(cam2, 320, 0);
42. image(cam1, 0, 200);
43. image(cam2, 320, 200);
44. // The following does the same, and is faster when just drawing the image
45. // without any additional resizing, transformations, or tint.
46. //set(0, 0, cam);
47. int random = int(random(2));
48. println(random);
49. randomCamera(random);
50. }
53. void randomCamera(int rand){
55. switch(rand) {
56. case 0:
57. cam1.start();
58. cam2.stop();
59. break;
60. case 1:
61. cam2.start();
62. cam1.stop();
63. break;
64. default: // Default executes if the case labels
65. println("None"); // don't match the switch parameter
66. break;
67. }
69. }

Changing which video is playing on button press

[1 Reply]
- 09-Mar-2013 06:21 AM
- Forum: Core Library Questions
Hello,

I currently have a sketch here, that runs a video in a circle that follows the mouse. I would like to get it so that the video changes when a button is pressed.

I have it that the video changes while one is holding the button, but i want one press to equal a sort of "play" button, i will have multiple buttons all wired to a different video.

This code also seems to run really slow, any ideas on how to improve that aspect are welcome as well.

thanks
1. import processing.video.*;
  import processing.serial.*;
  
  Serial myPort; // Create object from Serial class
  int val;      // Data received from the serial port
  Movie movie1, movie2, middlemovie;
  
  void setup() {
  size(displayWidth, displayHeight);
  background(0);
  frameRate(30);
  // Load and play the video in a loop
  movie2 = new Movie(this, "looping_static_1.mov.1");
  movie2.loop();
  String portName = Serial.list()[0];
  myPort = new Serial(this, portName, 9600);
  }
  
  void movieEvent(Movie m) {
  m.read();
  }
  
  void draw(){
  if ( myPort.available() > 0) { // If data is available,
      val = myPort.read();         // read it and store it in val
  }
  if (val == 0) {             // If the serial value is 0,
      movie1 = new Movie(this, "transit.mov");
      movie1.loop();
  }
  else {
      movie1 = new Movie(this, "looping_static_1.mov.1");
      movie1.loop();
  }
  float solidRadius = 160.0; // radius of solid circle.
  float radius = 200.0; // radius of the fading circle.
  movie1.read();
  movie2.read();
  // movie1.loadPixels();
  image(movie2, 0,0);
  loadPixels();
  for (int x = mouseX-int(radius); x <= mouseX+int(radius); x++ ) {
      for (int y = mouseY-int(radius); y <= mouseY+int(radius); y++ ) {
        if( y < 0 || y >= height || x < 0 || x >= width ){
          continue;
        }
        int loc = x + y*width;
        // if this next line gives you issues, use the commented out one below it instead.
        color val = movie1.get(x,y);
        // color val = movie1.pixels[loc];
        // And also uncomment the line "movie1.loadPixels();", above.
        float distance = dist(x,y,mouseX,mouseY);
        float transparency = map(radius-(distance-solidRadius), solidRadius, radius, 0.0, 255.0);
        color c = color(red(val), green(val), blue(val), transparency );
        pixels[loc] = distance<radius?blendColor(pixels[loc],c,BLEND):pixels[loc];
        pixels[loc] = distance<solidRadius?val:pixels[loc];
      }
  }
  updatePixels();
  }

Errors when running video in linux

[3 Replies]
- 06-Mar-2013 04:30 PM
- Forum: Integration and Hardware
trying to run the example sketch in linux but i keep getting the following error:

Exception in thread "Animation Thread" java.lang.UnsatisfiedLinkError: Unable to load library 'gstinterfaces-0.10': libgstinterfaces-0.10.so: cannot open shared object file: No such file or directory
    at com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:163)
    at com.sun.jna.NativeLibrary.getInstance(NativeLibrary.java:236)
    at com.sun.jna.Library$Handler.<init>(Library.java:140)
    at com.sun.jna.Native.loadLibrary(Native.java:379)
    at org.gstreamer.lowlevel.GNative.loadNativeLibrary(Unknown Source)
    at org.gstreamer.lowlevel.GNative.loadLibrary(Unknown Source)
    at org.gstreamer.lowlevel.GstNative.load(GstNative.java:42)
    at org.gstreamer.lowlevel.GstColorBalanceAPI.<clinit>(GstColorBalanceAPI.java:30)
    at org.gstreamer.lowlevel.GstTypes$StaticData$1.<init>(GstTypes.java:171)
    at org.gstreamer.lowlevel.GstTypes$StaticData.<clinit>(GstTypes.java:168)
    at org.gstreamer.lowlevel.GstTypes.getTypeMap(GstTypes.java:117)
    at org.gstreamer.lowlevel.GstTypes.classFor(GstTypes.java:95)
    at org.gstreamer.lowlevel.NativeObject.classFor(NativeObject.java:210)
    at org.gstreamer.lowlevel.NativeObject.objectFor(NativeObject.java:187)
    at org.gstreamer.lowlevel.NativeObject.objectFor(NativeObject.java:164)
    at org.gstreamer.lowlevel.NativeObject.objectFor(NativeObject.java:161)
    at org.gstreamer.lowlevel.NativeObject.objectFor(NativeObject.java:158)
    at org.gstreamer.ElementFactory.elementFor(ElementFactory.java:230)
    at org.gstreamer.ElementFactory.make(ElementFactory.java:211)

what do i have to install to get rid of the error?

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