ffmpeg-utils.el

   1 ;;; ffmpeg-utils.el --- FFmpeg command utilities wrappers -*- lexical-binding: t; -*-
   2
   3 ;;; Time-stamp: <2020-10-29 11:08:29 stardiviner>
   4
   5 ;; Authors: stardiviner <numbchild@gmail.com>
   6 ;; Package-Requires: ((emacs "25.1") (alert "1.2") (transient "0.1.0") (osx-lib "0.1"))
   7 ;; Package-Version: 0.1
   8 ;; Keywords: multimedia
   9 ;; homepage: https://repo.or.cz/ffmpeg-utils.git
  10
  11 ;; ffmpeg-utils.el is free software; you can redistribute it and/or modify it
  12 ;; under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 3, or (at your option)
  14 ;; any later version.
  15 ;;
  16 ;; ffmpeg-utils.el is distributed in the hope that it will be useful, but WITHOUT
  17 ;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  18 ;; or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  19 ;; License for more details.
  20 ;;
  21 ;;
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;; Usage:
  28 ;;; - [M-x ffmpeg-cut-clip]
  29
  30 ;;; Code:
  31 \f
  32 (require 'notifications)
  33 (require 'alert)
  34 (require 'transient)
  35
  36 (defvar ffmpeg--output-filename nil
  37   "A variable to store the command output filename which used in notification.")
  38
  39 (defcustom ffmpeg-notification-function 'ffmpeg-notification-default
  40   "Specify the ffmpeg command process sentinel function."
  41   :type 'function
  42   :safe #'functionp
  43   :group 'ffmpeg)
  44
  45 (defun ffmpeg-notification-default (&optional proc event)
  46   "The ffmpeg command process sentinel notification function with args PROC, EVENT."
  47   (setq mode-line-process nil)     ; remove mode-line-process indicator.
  48   (let ((msg (format "ffmpeg cut %s finished" (file-name-nondirectory ffmpeg--output-filename))))
  49     (pcase system-type
  50       ('gnu/linux
  51        (cond
  52         ((and (featurep 'dbus) (fboundp 'notifications-notify))
  53          (notifications-notify :title "Emacs ffmpeg-utils.el" :body msg))))
  54       ('darwin
  55        (cond
  56         ((featurep 'alert)
  57          (let ((msg "Emacs ffmpeg-utils.el process finished."))
  58            (cl-case system-type
  59              (darwin
  60               (ns-do-applescript (format "say \"%s\"" msg))))
  61            (alert msg :title "Emacs ffmpeg-utils.el")))
  62         ((and (featurep 'osx-lib) (bound-and-true-p osx-lib-start-terminal))
  63          (require 'osx-lib)
  64          (osx-lib-notify2 "Emacs ffmpeg-utils.el" msg))
  65         ((fboundp 'ns-do-applescript)
  66          (ns-do-applescript
  67           (format "display notification \"%s\" with title \"%s\""
  68                   msg "Emacs ffmpeg-utils.el")))
  69         ((executable-find "osascript")
  70          ;; (start-process
  71          ;;  "emacs-timer-notification" nil
  72          ;;  "osascript"
  73          ;;  (format "-e 'display notification \"%s\" with title \"%s\"'" msg "Emacs ffmpeg-utils.el"))
  74          (shell-command
  75           (format "osascript -e 'display notification \"%s\" with title \"%s\"'"
  76                   "yes" "Emacs ffmpeg-utils.el")))))
  77       (_ (message (format "Emacs ffmpeg-utils.el: %s" msg))))))
  78
  79 (defun ffmpeg--run-command (arglist)
  80   "Construct ffmpeg command with ARGLIST, SENTINEL-FUNC and BODY."
  81   (make-process
  82    :name "ffmpeg"
  83    :command (append '("ffmpeg") arglist) ; <------------- problem here
  84    :buffer "*ffmpeg*"
  85    :sentinel ffmpeg-notification-function))
  86
  87 (defun ffmpeg-mode-line-running-indicator (msg)
  88   "Display a running indicator on mode-line."
  89   (setq mode-line-process
  90         (concat " "
  91                 (propertize (or msg "ffmpeg running...")
  92                             'font-lock-face 'mode-line-highlight)))
  93   (force-mode-line-update t))
  94
  95 ;;; ffmpeg command option "-t" accept seconds like 57 as value.
  96 (defun ffmpeg--subtract-timestamps (start-timestamp end-timestamp)
  97   "Subtract END-TIMESTAMP with START-TIMESTAMP."
  98   (time-subtract
  99    (encode-time
 100     (parse-time-string    ; (SECOND MINUTE HOUR DAY MONTH YEAR IGNORED DST ZONE)
 101      (concat "2020-01-01" " " end-timestamp)))
 102    (encode-time
 103     (parse-time-string
 104      (concat "2020-01-01" " " start-timestamp)))))
 105
 106 ;; (ffmpeg--subtract-timestamps "00:11:25" "00:12:12")
 107
 108 (defun ffmpeg-cut-clip (input-filename start-timestamp end-timestamp output-filename)
 109   "Cut clip of media INPUT-FILENAME between START-TIMESTAMP END-TIMESTAMP and output to OUTPUT-FILENAME.
 110
 111 Support read timestamp begin/end range in format like this: 00:17:23 -- 00:21:45."
 112   (interactive (if (region-active-p)
 113                    ;; regexp spec detect "00:17:23 -- 00:21:45"
 114                    (let* ((time-range (split-string
 115                                        (buffer-substring-no-properties (region-beginning) (region-end))
 116                                        " -- "))
 117                           (timestamp-begin (car time-range))
 118                           (timestamp-end (cadr time-range)))
 119                      (list
 120                       (expand-file-name
 121                        (substring-no-properties
 122                         (read-file-name "FFmpeg input filename: " nil nil 'confirm-after-completion)))
 123                       timestamp-begin
 124                       timestamp-end
 125                       (expand-file-name
 126                        (substring-no-properties
 127                         (read-file-name "FFmpeg output filename: ")))))
 128                  (list
 129                   (read-file-name "FFmpeg input filename: ")
 130                   (read-string "FFmpeg start timestamp: ")
 131                   (read-string "FFmpeg end timestamp: ")
 132                   (read-file-name "FFmpeg output filename: "))))
 133   (when (region-active-p) (deactivate-mark) (forward-line) (newline) (forward-line -1))
 134   (ffmpeg-mode-line-running-indicator "ffmpeg cut video clip")
 135   (setq ffmpeg--output-filename output-filename)
 136   (let ((input-type (file-name-extension input-filename))
 137         (output-type (file-name-extension output-filename)))
 138     (if output-type
 139         ;; output filename specified video file extension.
 140         (if (string-equal output-type input-type) ; if output extension is same as input
 141             output-filename             ; keep output original extension
 142           (if (yes-or-no-p "Whether keep output video format extension? ")
 143               output-filename
 144             (setq output-filename (format "%s.%s" (file-name-sans-extension output-filename) input-type))))
 145       ;; output filename has NOT specific video file extension.
 146       (setq output-filename (format "%s.%s" output-filename input-type)))
 147     ;; "ffmpeg -i input-filename -ss start-timestamp -t time-timestamp -codec copy output-filename"
 148     (ffmpeg--run-command
 149      `("-i" ,input-filename
 150        "-ss" ,start-timestamp
 151        "-t" ,(number-to-string (ffmpeg--subtract-timestamps start-timestamp end-timestamp))
 152        "-codec" "copy"
 153        ,output-filename))))
 154
 155 ;; (define-transient-command ffmpeg-transient ()
 156 ;;   "ffmpeg transient commands"
 157 ;;   ["Video"
 158 ;;    ("c" "Cut video clip" ffmpeg-cut-clip)]
 159 ;;   ["Audio"
 160 ;;    ("c" "Cut audio clip" ffmpeg-cut-clip)])
 161
 162 \f
 163
 164 (provide 'ffmpeg-utils)
 165
 166 ;;; ffmpeg-utils.el ends here