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* How to subtract timestamp in elisp?
@ 2020-07-04 11:11 stardiviner
  2020-07-04 11:39 ` Eli Zaretskii
                   ` (3 more replies)
  0 siblings, 4 replies; 9+ messages in thread
From: stardiviner @ 2020-07-04 11:11 UTC (permalink / raw)
  To: Emacs Help


I'm find an Elisp solution to subtract timestamps like "00:12:35".

I hope a function can subtract two timestamps:

    00:12:35 - 00:10:45 = 00:01:50

Is there some hints or suggestion like function name or Emacs library or package?
Or can convert timestamp into another format then convert back to timestamp.

I use those timestamps in "ffmpeg" command video cut clip command option "-ss" and "-t".

Or Linux command is acceptable. I can write a function to execute shell command then parse the result.

Here is my current code:

#+begin_src emacs-lisp
(defun ffmpeg-cut-clip (input-filename start-timestamp end-timestamp output-filename)
  (interactive (list
                (read-file-name "FFmpeg input filename: ")
                (read-string "FFmpeg start timestamp: ")
                (read-string "FFmpeg time timestamp: ")
                (read-file-name "FFmpeg output filename: ")))
  (let ((time-timestamp (FUNC start-timestamp end-timestamp)))
    (make-process
     :name "ffmpeg cut clip"
     ;; "ffmpeg -i input-filename -ss start-timestamp -t time-timestamp -codec copy output-filename"
     :command (list "ffmpeg"
                    "-i" input-filename
                    "-ss" start-timestamp
                    "-t" time-timestamp
                    "-codec copy"
                    output-filename)
     :buffer "*ffmpeg-cut-clip*"
     :sentinel (lambda (proc event)
                 (message "FFmpeg cut video clip finished.")))))
#+end_src

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[ stardiviner ]
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^ permalink raw reply	[flat|nested] 9+ messages in thread

end of thread, other threads:[~2020-07-06  2:48 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2020-07-04 11:11 How to subtract timestamp in elisp? stardiviner
2020-07-04 11:39 ` Eli Zaretskii
2020-07-04 12:54 ` Michael Heerdegen
2020-07-04 21:17   ` Dmitry Alexandrov
2020-07-04 21:11 ` Dmitry Alexandrov
2020-07-05  3:04   ` [SOLVED] " stardiviner
2020-07-06  2:48     ` mu4e: configuring SMTP (was: [SOLVED] Re: How to subtract timestamp in elisp?) Dmitry Alexandrov
2020-07-05 13:30 ` How to subtract timestamp in elisp? Emanuel Berg via Users list for the GNU Emacs text editor
2020-07-06  1:43   ` stardiviner

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