I'm trying to play either png or tiff movies that have a valid alpha channel.
I looked here and found some code. I get the problem that the images write on top of each other, rather than having a clear each frame. If I try to use the background statement in the movie event, it does clear, but I get a flickering problem. I would just like the unmasked portion of my movie to play over a red background. here is the code, please let me know what I am doing wrong:

import processing.video.*;
Movie myMovie;

void setup() {
background(255,0,0);
 size(640, 480);
 myMovie = new Movie(this, "baseball.mov");
 myMovie.loop();
myMovie.mask(myMovie);

// myMovie.loop();
}

void movieEvent(Movie myMovie)  
{  
background(255,0,0);
myMovie.read();
myMovie.mask(myMovie);

}  

void draw() {
 
 image(myMovie, 0, 0);
 
}