downloader

type FormatData struct {
	// [URLData: {URL, Size, Ext}, ...]
	// Some video files have multiple fragments
	// and support for downloading multiple image files at once
	URLs    []URLData
	Quality string
	Size    int64 // total size of all urls
}

type URLData struct {
	URL  string
	Size int64
	Ext  string
}

type VideoData struct {
	Site  string
	Title string
	Type  string
	// each format has it's own URLs and Quality
	Formats map[string]FormatData
}