Processing can be used to generate movies. This is usually achieved in two steps: first we write a program that saves hundreds of images to disk. The second step involves combining all those images into a movie. Many different programs can be used to combine images into a movie. We use a free command line program called ffmpeg, but feel free to use any other program you find on the Internet to achieve this.
In the first 6 minutes of this episode we write a program that creates an animated effect. You can skip this first part and start watching at 06:10 if you just want to find out how to save the images to disk, combine them into a movie and upload it to the Internet.