Help needed to code videos play with processing by receiving data from Arduino

Processing Electronics (Arduino, etc.)
5

Ok so, here’s what my draw() looks like

void draw() {
if(arduino.available()>0)
{
serialIn=arduino.read();
println(serialIn);

if (val <= THRESHOLD) { //If the sensor detect object at less 50cm
  sound.stop();
  video.play();
  //image(video,0,0);
  useImageMovie= true;
}
   if(useImageMovie) {
   image(video,0,0);
   useImageMovie = false;
   }
    else {
     image(sound,0,0);
   }
   useImageMovie= false;
 }

}

but still nothing. The first video stops and the second plays right after without any interaction with the sensor.

I’m sorry I dont understand the question.