[Alexander_88]

megaloman, Спасибо, теперь даже необязательно домен в скрипте указывать

[alpap]

Предложу и свой вариант
PowerShell

Код:

$file = 'file.txt'
$sId  = 'delete link'
$ext  = 'mp4'

$uName = gc $file|% {([uri]$_).Segments[-1]}
$we    = $uName|% {[System.IO.FileInfo]::New($_)}
$name  = $we.BaseName|% {[regex]::Match($_, '[\d{4}]*(\D*)[\d{4}]*').Groups[1].Value}
$num   = $we.BaseName|% {[regex]::Match($_, '\d{4}').Value}
$l     = (gc $file)[0] -Split '/+'
$prf   = '{0}//{1}/{2}' -f $l[0], $l[1], $l[2]

1..$num[-1]|% {
  $d4 = '{0:d4}' -f $_
  if ($d4 -NotIn $num) {'{0}/{1}/{2}{3}.{4}' -f $prf, $sId, $d4, $name[$d4], $ext}
  (gc $file)[$d4-1]
}

Тестировал на файле с таким содержимым:

file.txt

Код:

https://k2s.cc/file/74gsjddf53/0001start.mp4
https://k2s.cc/file/f0bmfg86d/0002start.mp4
https://k2s.cc/file/82cdsfgs7879/0003start.mp4
https://k2s.cc/file/2ca5fj414b6/0004start.mp4
https://k2s.cc/file/a2bfgjfs0dbf1/0005start.mp4
https://k2s.cc/file/484df773a/0006start.flv
https://k2s.cc/file/56cdfdabd7/0007start.flv
https://k2s.cc/file/613bdgdfg632/0009start.mp4
https://k2s.cc/file/e95bdfhdfha2557/0010start.mp4
https://k2s.cc/file/df3f1vcj74f2/0011start.mp4
https://k2s.cc/file/0c7erert450f6/aaa0012.mp4
https://k2s.cc/file/bd9srtey50f7a/0013start.mp4
https://k2s.cc/file/bbb8fgj22c7d1/0014start.mp4
https://k2s.cc/file/c5b0awet3652/0015start.mp4
https://k2s.cc/file/a3c83fgj0abd4/0016start.mp4
https://k2s.cc/file/4328aj34bd5f2/0017start.mp4
http://k2s.cc/file/90fb6sj6187/0018start.mp4
https://k2s.cc/file/055xn72ec7db/0019start.mp4
https://k2s.cc/file/e27xxn6b45f/0020start.mp4
https://k2s.cc/file/1804xn6fad3/0021start.mp4
https://k2s.cc/file/a47d4xxn9d8c/0022start.mp4
https://k2s.cc/file/89dnxbc13b/0024start.mp4
https://k2s.cc/file/9cesf0bh163/bbb0025.mp4
https://k2s.cc/file/5bs2fgh65e98b/0026start.mp4
https://k2s.cc/file/daach76d0efdeb/0027start.mp4
https://k2s.cc/file/be4cj8b4ee6f8e/0029start.mp4
https://k2s.cc/file/764ffgh819eaa5/0030start.mp4
https://k2s.cc/file/ff5bd6fgh6d4c7/0031start.mp4
https://k2s.cc/file/9d22adfg0d34e/0032start.mp4
https://k2s.cc/file/7438gfjfe5d5a2/0033start.mp4
https://k2s.cc/file/b532sdg7141b5/0036start.mp4
https://k2s.cc/file/c575df1616937/0037start.mp4
https://k2s.cc/file/a4a46fgj6e1f424/0038start.mp4
https://k2s.cc/file/2332dfha124a61/0039start.mp4
https://k2s.cc/file/40cbsdg65a8737/0040start.mp4
http://k2s.cc/file/ee6dfh4c8408/stop0041.mp4
https://k2s.cc/file/93cvh46f6aa0/0042start.mp4
https://k2s.cc/file/302ert64dbf64/0043start.mp4
https://k2s.cc/file/1c49bsdf969/0044start.mp4
https://k2s.cc/file/d8360sdf6710/0045start.mp4