diff --git a/mpv-yt-helper.scm b/mpv-yt-helper.scm
new file mode 100644
index 0000000..b888561
--- /dev/null
+++ b/mpv-yt-helper.scm
@@ -0,0 +1,58 @@
+(import (ice-9 popen)
+	(ice-9 rdelim)
+	(ice-9 regex)
+	(ice-9 textual-ports)
+	(os process))
+
+;;; (display "Define void port for stderr")
+;;; (newline)
+;;; (define void (%make-void-port "w"))
+;;; 
+;;; (display "Store original error port")
+;;; (newline)
+;;; (define original-error-port (current-error-port))
+;;; 
+;;; (display "Redirect stderr to /dev/null")
+;;; (set-current-error-port void)
+;;; (newline)
+
+(define (parse-format-line line)
+  (let* ((video-match (string-match "([0-9]{3,}).*([0-9]{3,}x[0-9]{3,}).*(video only).*" line))
+         (audio-match (string-match "([0-9]{3,}-?).*(audio only).*" line)))
+  
+    (cond
+      (video-match
+        (let ((video-code (match:substring video-match 1))
+  	      (video-resolution (match:substring video-match 2))
+  	      (video-moreinfo (match:substring video-match 3)))
+	    video-code))
+
+      (audio-match
+        (let  ((audio-code (match:substring audio-match 1))
+  	       (audio-moreinfo (match:substring audio-match 2)))
+          (if (string=? "234" audio-code)
+	    audio-code))))))
+
+
+(define fetch-format-lines 
+  (let* ((url "https://www.youtube.com/watch?v=m5RuTLhUPU4")
+        (yt-dlp-port (open-input-pipe (string-append "yt-dlp --no-warnings --list-formats " url))))
+        
+    (let loop ((this-line (get-line yt-dlp-port)))
+
+      (if (not (eof-object? this-line))
+	(begin
+	  (if (parse-format-line this-line)
+	    (format #t "CODE: ~a\n" (parse-format-line this-line)))
+	  (loop (get-line yt-dlp-port)))
+	(format #t "EOF\n")))
+
+    (close-pipe yt-dlp-port)))
+
+(define defaults
+  `((preferred-video-codes . ("234" "311"))
+    (preferred-audio-codes . ("232"))))
+
+;; Not working, pseudoscheme
+(define (call-mpv video-code audio-code)
+  (system (string-append "mpv --ytdl-format=" audio-code "+" video-code url)))