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video sequencer with mixing

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Hi,
I need to receive a random one video mixed with another when it ends. One to another transition by level mixing. I do not understand how to make the mixing depended the duration video.and how to make a mix m1 goes from high to complete absence and m2 inverse

import processing.video.*;
Movie [] m1 = new Movie [15];

Movie [] m2 = new Movie [15];
int movieIndex=0;
float totalTime = 0.10;
int numPixels;
int typeBlend = ADD;
void setup() {
  size( 1920, 1080 );
  //here you need to randomly loaded
  //where one ends and another has entered so in the loop
  for (int i = 0; i < m1.length; i ++ ) {
    m1 = new Movie( this, random("1" + "i" + ".mov") );
    //m1.loop();
    for (int i = 0; i < m2.length; i ++ ) {
      m2 = new Movie( this, random("1" + "i" + ".mov" ));
     // m2.loop();
      //m2.speed( 0.5 );
      numPixels = m1.width * m1.height;
    }
    void movieEvent(Movie m) {
      m.read();
    }
    void draw()
      //then it is necessary that the mixing depended the duration video and
      //as one approaches the end of the following mixing started
      //and mixing a m1 goes from high to complete absence
      //m2 invert m1
    {
      m1.loadPixels();
      m2.loadPixels();
      float blendThresh = map(mouseX, 0, width, 0, 255);
      for (int i = 0; i < numPixels; i++) {
        float b = brightness(m1.pixels[i]);
        if ( b > blendThresh ) {
          m1.pixels[i] = lerpColor(m1.pixels[i], m2.pixels[i], map(b, 0, 255, 0, 1));
        }
      }
      m1.updatePixels();
      image(m1[movieIndex], 0, 0, width, height );
      blend(m2[movieIndex], 0, 0, width, height, 0, 0, width, height, typeBlend );
      if (typeBlend == SUBTRACT)   typeBlend = LIGHTEST;
      movieIndex = (movieIndex + 1) % m1.length;
      movieIndex = (movieIndex + 1) % m2.length;
    }


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