I tried to capture rtsp streaming using http://gsvideo.sourceforge.net/
I've success when using gst-launch from my linux console.

But when I tried to combine with PApplet, i got the gstreamer applet outside the PApplet, and I only got the first frame (not rtsp stream. Is there any suggestion ?

here below my script :

import codeanticode.gsvideo.*;
import processing.core.PApplet;

public class Streaming extends PApplet {
    GSPipeline pipe;

    public void setup() {
        size(640,480);
        pipe = new GSPipeline(this, "rtspsrc location=blablabla");
        pipe.play();
    }

    public void draw() {
        if (pipe.available()) {
            pipe.read();
            image(pipe, 0, 0);
        }
    }

    static public void main(String args[]) {
        PApplet.main(new String[] {"Streaming" });
    }
}