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") (transient "0.1.0"))
   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 default ffmpeg command process sentinel notification function."
  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          (osx-lib-notify2 "Emacs ffmpeg-utils.el" msg))
  64         ((fboundp 'ns-do-applescript)
  65          (ns-do-applescript
  66           (format "display notification \"%s\" with title \"%s\""
  67                   msg "Emacs ffmpeg-utils.el")))
  68         ((executable-find "osascript")
  69          (start-process
  70           "emacs-timer-notification" nil
  71           "osascript" "-e"
  72           (format "'display notification \"%s\" with title \"title\"'" msg "Emacs ffmpeg-utils.el")))))
  73       (_ (message (format "Emacs ffmpeg-utils.el: %s" msg))))))
  74
  75 (defun ffmpeg--run-command (arglist)
  76   "Construct ffmpeg command with ARGLIST, SENTINEL-FUNC and BODY."
  77   (make-process
  78    :name "ffmpeg"
  79    :command (append '("ffmpeg") arglist) ; <------------- problem here
  80    :buffer "*ffmpeg*"
  81    :sentinel ffmpeg-notification-function))
  82
  83 (defun ffmpeg-mode-line-running-indicator (msg)
  84   "Display a running indicator on mode-line."
  85   (setq mode-line-process
  86         (concat " "
  87                 (propertize (or msg "ffmpeg running...")
  88                             'font-lock-face 'mode-line-highlight)))
  89   (force-mode-line-update t))
  90
  91 ;;; ffmpeg command option "-t" accept seconds like 57 as value.
  92 (defun ffmpeg--subtract-timestamps (start-timestamp end-timestamp)
  93   "Subtract END-TIMESTAMP with START-TIMESTAMP."
  94   (time-subtract
  95    (encode-time
  96     (parse-time-string    ; (SECOND MINUTE HOUR DAY MONTH YEAR IGNORED DST ZONE)
  97      (concat "2020-01-01" " " end-timestamp)))
  98    (encode-time
  99     (parse-time-string
 100      (concat "2020-01-01" " " start-timestamp)))))
 101
 102 ;; (ffmpeg--subtract-timestamps "00:11:25" "00:12:12")
 103
 104 (defun ffmpeg-cut-clip (input-filename start-timestamp end-timestamp output-filename)
 105   "Cut clip of media INPUT-FILENAME between START-TIMESTAMP END-TIMESTAMP and output to OUTPUT-FILENAME.
 106
 107 Support read timestamp begin/end range in format like this: 00:17:23 -- 00:21:45."
 108   (interactive (if (region-active-p)
 109                    ;; regexp spec detect "00:17:23 -- 00:21:45"
 110                    (let* ((time-range (split-string
 111                                        (buffer-substring-no-properties (region-beginning) (region-end))
 112                                        " -- "))
 113                           (timestamp-begin (car time-range))
 114                           (timestamp-end (cadr time-range)))
 115                      (list
 116                       (expand-file-name
 117                        (substring-no-properties
 118                         (read-file-name "FFmpeg input filename: " nil nil 'confirm-after-completion)))
 119                       timestamp-begin
 120                       timestamp-end
 121                       (expand-file-name
 122                        (substring-no-properties
 123                         (read-file-name "FFmpeg output filename: ")))))
 124                  (list
 125                   (read-file-name "FFmpeg input filename: ")
 126                   (read-string "FFmpeg start timestamp: ")
 127                   (read-string "FFmpeg end timestamp: ")
 128                   (read-file-name "FFmpeg output filename: "))))
 129   (when (region-active-p) (deactivate-mark) (forward-line) (newline) (forward-line -1))
 130   (ffmpeg-mode-line-running-indicator "ffmpeg cut video clip")
 131   (setq ffmpeg--output-filename output-filename)
 132   (let ((input-type (file-name-extension input-filename))
 133         (output-type (file-name-extension output-filename)))
 134     (if output-type
 135         ;; output filename specified video file extension.
 136         (if (string-equal output-type input-type) ; if output extension is same as input
 137             output-filename             ; keep output original extension
 138           (if (yes-or-no-p "Whether keep output video format extension? ")
 139               output-filename
 140             (setq output-filename (format "%s.%s" (file-name-sans-extension output-filename) input-type))))
 141       ;; output filename has NOT specific video file extension.
 142       (setq output-filename (format "%s.%s" output-filename input-type)))
 143     ;; "ffmpeg -i input-filename -ss start-timestamp -t time-timestamp -codec copy output-filename"
 144     (ffmpeg--run-command
 145      `("-i" ,input-filename
 146        "-ss" ,start-timestamp
 147        "-t" ,(number-to-string (ffmpeg--subtract-timestamps start-timestamp end-timestamp))
 148        "-codec" "copy"
 149        ,output-filename))))
 150
 151 (define-transient-command ffmpeg-transient ()
 152   "ffmpeg transient commands"
 153   ["Video"
 154    ("c" "Cut video clip" ffmpeg-cut-clip)]
 155   ["Audio"
 156    ("c" "Cut audio clip" ffmpeg-cut-clip)])
 157
 158 \f
 159
 160 (provide 'ffmpeg-utils)
 161
 162 ;;; ffmpeg-utils.el ends here