diff --git a/lisp/init-built-in.el b/lisp/init-built-in.el
index 1dd2116..268fccb 100644
--- a/lisp/init-built-in.el
+++ b/lisp/init-built-in.el
@@ -111,7 +111,9 @@
   (setq dired-recursive-deletes 'always)
 
   ;; don't make too many dired buffer
-  (put 'dired-find-alternate-file 'disabled nil))
+  (put 'dired-find-alternate-file 'disabled nil)
+
+  (define-key dired-mode-map (kbd "b") #'creature/mpv))
 
 (add-hook 'display-fill-column-indicator-mode-hook
           (lambda ()
diff --git a/lisp/init-func.el b/lisp/init-func.el
index 18aa7ab..36e99ce 100644
--- a/lisp/init-func.el
+++ b/lisp/init-func.el
@@ -44,6 +44,39 @@
               (buffer-string)))
            (t (concat "/sudo:root@localhost:" fname))))))
 
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;                                    mpv                                    ;;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+(defun creature/is-bd-dir (dir)
+  (let ((index-file (file-name-concat dir "BDMV" "index.bdmv"))
+        (stream-dir (file-name-concat dir "BDMV" "STREAM"))
+        (playlist-dir (file-name-concat dir "BDMV" "PLAYLIST")))
+    (and (file-exists-p index-file)
+         (not (directory-empty-p stream-dir))
+         (not (directory-empty-p playlist-dir)))))
+
+(defun creature/is-iso-file (filename)
+  (and (string-equal (downcase (or (file-name-extension filename) "")) "iso")
+       (file-exists-p filename)))
+
+(defun creature/open-by-mpv (filename)
+  (cond
+   ((creature/is-bd-dir filename)
+    (call-process "mpv" nil 0 nil filename))
+   ((creature/is-iso-file filename)
+    (call-process "mpv" nil 0 nil
+                  "bd://"
+                  (concat "--bluray-device=" filename)))
+   (t
+    (call-process "mpv" nil 0 nil filename))))
+
+(defun creature/mpv ()
+  (interactive)
+  (let ((filename (if (derived-mode-p 'dired-mode)
+                      (dired-get-file-for-visit)
+                    (buffer-file-name))))
+    (when filename (creature/open-by-mpv filename))))
+
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;                               indentation                                 ;;
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
diff --git a/lisp/init-keybindings.el b/lisp/init-keybindings.el
index aee689e..752fcbe 100644
--- a/lisp/init-keybindings.el
+++ b/lisp/init-keybindings.el
@@ -81,6 +81,7 @@
    ("be" . eval-buffer)
 
    ("fi" . creature/open-init-file)
+   ("fm" . creature/mpv)
    ("fo" . creature/open-file-or-directory-in-external-app)
    ("fj" . dired-jump)
    ("ff" . find-file)