Hi, I'm trying to run Golin Levin's code and I'm getting this error:

/tmp/build1116.tmp/Temporary_6480_1818.java:22:3:22:43: Semantic Error: No accessible method with signature "beginVideo(int, int, int)" was found in type "Temporary_6480_1818".

/tmp/build1116.tmp/Temporary_6480_1818.java:36:18:36:22: Semantic Error: No field named "video" was found in type "Temporary_6480_1818". However, there is an accessible field "video_width" whose name closely matches the name "video".



Can anyone help me ?

Thanks.


Here is the code I'm talking about:

// Processing code for detecting and quantifying  
// the amount of movement in the video frame
// using a simple Frame-Differencing technique.

import processing.video.*;

int video_width  = 320;
int video_height = 240;
int num_pixels = (video_width * video_height);
int previous_frame[];

//-------------------------------------------
void setup(){
 size(320, 240);

 previous_frame = new int [num_pixels];    // Allocate memory for storing the previous
 for (int i=0; i<num_pixels; i++){    // frame of video, and initialize this buffer
   previous_frame[i] = 0;   // with blank values.
 }

 beginVideo(video_width, video_height, 30);
}

//-------------------------------------------
void loop(){

 int curr_color, prev_color;      // Declare variables to store a pixel's color.
 float curr_r, curr_g, curr_b;    // Declare variables to hold current color values.
 float prev_r, prev_g, prev_b;    // Declare variables to hold previous color values.
 float diff_r, diff_g, diff_b;    // Declare variables to hold computed differences.
 float movement_sum = 0;     // This stores the amount of movement in this frame.


 for (int i=0; i<num_pixels; i++){     // For each pixel in the video frame,
   curr_color = video.pixels[i];  // Fetch the current color in that location,
   prev_color = previous_frame[i];     // and also the previous color from that spot.

   curr_r = red   (curr_color);   // Extract the red, green, and blue components
   curr_g = green (curr_color);   // of the current pixel's color.
   curr_b = blue  (curr_color);

   prev_r = red   (prev_color);   // Extract the red, green, and blue components
   prev_g = green (prev_color);   // of the previous pixel's color.
   prev_b = blue  (prev_color);

   diff_r = abs (curr_r - prev_r);     // Compute the difference of the red values.
   diff_g = abs (curr_g - prev_g);     // Compute the difference of the green values.
   diff_b = abs (curr_b - prev_b);     // Compute the difference of the blue values.

   movement_sum += diff_r+diff_g+diff_b;    // Add these differences to the running tally.
   pixels[i] = color(diff_r,diff_g,diff_b); // Render the difference image to the screen.
   previous_frame[i] = curr_color;     // Swap the current information into the previous.  
   
 }
 
 println(movement_sum);      // Print out the total amount of movement
}

Forgot to mention that the working code is in the examples folder of processing.