public class MyCode{
public static void main(String[] args){

Runtime runtime = Runtime.getRuntime();
Process process = runtime.exec("C:\Usersmg\Desktop\test\ffmpeg -i C:\Usersmg\Desktop\test\video.mp4 -vf blackdetect=d=0.1:pix_th=.1 -an -f null 2> C:\Usersmg\Desktop\test\output.txt C:\Usersmg\Desktop\test");

BufferedReader input = new BufferedReader(new InputStreamReader(process.getInputStream()));

int exitCode = process.waitFor();
System.out.println(exitCode);
}