func getVideoUrl(str, resolution dna.String) *VideoUrl {
su := NewVideoUrl()
su.Resolution = resolution
su.Type = getType(str)
su.Link = str.GetTagAttributes("href").ReplaceWithRegexp(`(http.+/).+(\..+$)`, "${1}file-name${2}")
size := str.FindAllString(`[0-9\.]+ MB`, -1)
if size.Length() > 0 {
su.Size = size[0].ParseBytesFormat() / 1000
}
return su
}