[FFmpeg-user] Copying sections of an mp4 by time stamp

Toni Cambronero García tocamgar at gmail.com
Thu Aug 27 12:22:23 EEST 2020


This link will explain to you all the secrets of coping sections of videos:
https://youtu.be/hElDsyuAQDA?t=729

Gracias por su atención.

[image: foto+carn%C3%A9+copy.png]
Antonio Cambronero García
46470 Catarroja (Valencia)

✉ tocamgar at gmail.com
*☎** 696 01 41 41*




El jue., 27 ago. 2020 a las 6:53, Jim DeLaHunt (<list+ffmpeg-user at jdlh.com>)
escribió:

> On 2020-08-26 19:50, James Sundquist wrote:
> > I'm looking to copy sections of example.mp4
> >
> > Ideally this would be by time stamp.  Perhaps the time stamps are noted
> in
> > a text file.
> >
> > Example as minutes:second
> > 0:20 - 0:40 as a an mp4 with title "Exercise 1"
> > 0:40 - 0:59 as an mp4 with title "Exercise 2"
> > 0:20 - 0:59 as an mp4 with title "Primary Exercises"
> >
> Hello, James. Fortunately, this is pretty easy to do. Have you read the
> FFmpeg documentation[1] yet?
>
> Look up the main command line options `-ss` and `-to` [2]. If your input
> file is `example.mp4`, then the commands will be like:
>
> ffmpeg -i example.mp4 -ss 0:20 -to 0:40 exercise_1.mp4
> ffmpeg -i example.mp4 -ss 0:40 -to 0:59 exercise_2.mp4
> ffmpeg -i example.mp4 -ss 0:20 -to 0:59 primary_exercises.mp4
>
> Note that `-i example.mp4` says that `example.mp4` is the input video.
> The extension `.mp4` tells FFmpeg that the file is MP4 format. `-ss
> 0:20` means, "discard the input video until 0 minutes, 20 seconds in,
> then start copying to the output video from there. `-to 0:40` means stop
> copying to the output video when the input video is 0 minutes, 40
> seconds in.  There is documentation on this time duration syntax[3].
>
> I do not know of a convenient way to do all these cuts in one invocation
> of FFmpeg. There may be a way I don't know about. When I had to solve a
> similar problem, I invoked FFmpeg once for each cut.  I suggest you use
> a spreadsheet to generate this command invocation from your list of
> start time durations, end time durations, and output file names. Then
> paste the command invocations from the spreadsheet into the command
> line. The command line will run them one after the other.
>
> When you say "time stamps", I assume you mean the elapsed time from the
> start of the input video to your desired moment in the video. The
> documentation calls them "time durations", and means something else by
> "time stamps".
>
> [1] http://ffmpeg.org/documentation.html
> [2] http://ffmpeg.org/ffmpeg-all.html#Main-options
> [3] http://ffmpeg.org/ffmpeg-utils.html#time-duration-syntax
>
> Does this work for you?
>         —Jim DeLaHunt, software engineer, Vancouver, Canada
>
>
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