uint64_scale
Description:
Scale val by the rational number num / denom, avoiding overflows and underflows and without loss of 
      precision.
This function can potentially be very slow if val and num are both greater than G_MAXUINT32.
Parameters:
| val | the number to scale | 
| num | the numerator of the scale ratio | 
| denom | the denominator of the scale ratio | 
Returns:
| 
 | 
Namespace: Gst.Util
  
  Package: gstreamer-1.0