guint64 (such as a #GstClockTime) to scale.
numerator of the scale factor.
denominator of the scale factor.
val * num / denom. In the case of an overflow, this function returns G_MAXUINT64. If the result is not exactly representable as an integer, it is rounded to the nearest integer (half-way cases are rounded up). See also gst.global.utilUint64ScaleInt, gst.global.utilUint64ScaleIntCeil, gst.global.utilUint64Scale, gst.global.utilUint64ScaleRound, gst.global.utilUint64ScaleCeil.
Scale val by the rational number num / denom, avoiding overflows and underflows and without loss of precision. num must be non-negative and denom must be positive.