humble-video-noarch/src/main/java/io/humble/video/Rational.java
public static Rational sMultiply(Rational a, Rational b) {
    long cPtr = VideoJNI.Rational_sMultiply(Rational.getCPtr(a), a, Rational.getCPtr(b), b);
    return (cPtr == 0) ? null : new Rational(cPtr, false);
  }
public static Rational sMultiply(Rational a, Rational b) {
    long cPtr = VideoJNI.Rational_sMultiply(Rational.getCPtr(a), a, Rational.getCPtr(b), b);
    return (cPtr == 0) ? null : new Rational(cPtr, false);
  }
Multiples a by b.<br>
@param a the first number<br>
@param b the second number.<br>
@return a*b