sequence.go
func (s *FileSequence) SetFrameRange(frameRange string) error {
	frameSet, err := NewFrameSet(frameRange)
	if err != nil {
		return err
	}
	s.frameSet = frameSet
	return nil
}
func (s *FileSequence) SetFrameRange(frameRange string) error {
	frameSet, err := NewFrameSet(frameRange)
	if err != nil {
		return err
	}
	s.frameSet = frameSet
	return nil
}
// Set a new FrameSet, by way of providing a string frame range.
// If the frame range cannot be parsed, an error will be returned.