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

[James Sundquist]

Thank you Jim and Toni,

This is awesome.  Thank you both for the fantastic links.  Really helpful.
Excited to wrap my head around this.

On Thu, Aug 27, 2020 at 2:22 AM Toni Cambronero García <tocamgar at gmail.com>
wrote:

> 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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