fileseq.go
func minMaxFrame(frames []int) (int, int) {
	srcframes := make([]int, len(frames), len(frames))
	copy(srcframes, frames)
	sort.Ints(srcframes)
	min, max := srcframes[0], srcframes[len(srcframes)-1]
	return min, max
}
func minMaxFrame(frames []int) (int, int) {
	srcframes := make([]int, len(frames), len(frames))
	copy(srcframes, frames)
	sort.Ints(srcframes)
	min, max := srcframes[0], srcframes[len(srcframes)-1]
	return min, max
}
// Return the min/max frames from an unsorted list