func (s *FrameSet) Frame(index int) (int, error) {
	return s.rangePtr.Value(index)
}
func (s *FrameSet) Frame(index int) (int, error) {
	return s.rangePtr.Value(index)
}
func ( s * FrameSet ) Frame ( index int ) ( int , error ) { return s . rangePtr . Value ( index ) }
// Frame returns the frame number value for a given index into
// the frame set.
// If the index is outside the bounds of the frame set range,
// then an error is returned.
Frame returns the frame number value for a given index into the frame set . If the index is outside the bounds of the frame set range then an error is returned .