Re: Video Editing

From	gtr <xxx@yyy.zzz>
Newsgroups	comp.sys.mac.apps, comp.sys.mac.system
Subject	Re: Video Editing
Date	2020-11-13 14:01 -0800
Organization	A noiseless patient Spider
Message-ID	<romvol$3ac$1@dont-email.me> (permalink)
References	<romq5u$rub$3@dont-email.me> <i18arcF7spcU1@mid.individual.net>

Cross-posted to 2 groups.

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On 2020-11-13 21:06:53 +0000, Jolly Roger said:

> On 2020-11-13, gtr <xxx@yyy.zzz> wrote:
>> On 2020-11-13 10:22:07 +0000, Lewis said:
>> 
>>> In message <rojmhs$eqc$1@dont-email.me> gtr <xxx@yyy.zzz> wrote:
>>>> I'm looking for an app or utility, that will allow me to do the following:
>>> 
>>>> Feed it a video file, *type in a starting time code and and ending time
>>>> code*, and have it spit out the clip into separate file.  I need to
>>>> feed it 30 or more such files, culling 4 portions of video from each,
>>>> all of them at different times, so it has to be a realitively clean
>>>> interaction like this.
>>> 
>>> I do this via the command line with ffmpeg
>>> 
>>> #v+
>>> ffmpeg -i infile.mp4 -ss START -to END outfile.mp4
>>> #v-
>> 
>> I heard that upstream and appreciate it.  There the command is somewhat
>> different from yours:
>> 
>> ffmpeg -i input.mov -ss START -t LENGTH -acodec copy -vcodec copy output.mov
> 
> You can choose which to use based on your needs:
> 
> * The -t switch is for specifying the length of the clip.
> * The -to switch is for specifying the end time.
> 
> The "-*codec copy" switch just enables this optional feature:
> 
> ---
> Stream copy
> 
> Stream copy is a mode selected by supplying the "copy" parameter to the
> -codec option. It makes ffmpeg omit the decoding and encoding step for
> the specified stream, so it does only demuxing and muxing. It is useful
> for changing the container format or modifying container-level metadata.
> 
> The diagram above will, in this case, simplify to this:
> 
>                 _______              ______________            ________
>                |       |            |              |          |        |
>                | input |  demuxer   | encoded data |  muxer   | output |
>                | file  | ---------> | packets      | -------> | file   |
>                |_______|            |______________|          |________|
> 
> Since there is no decoding or encoding, it is very fast and there is no
> quality loss. However, it might not work in some cases because of many
> factors. Applying filters is obviously also impossible, since filters
> work on uncompressed data.
> ---
> Reference: ffmpeg manual

Excllent info. Thanks for that.

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Thread

Video Editing gtr <xxx@yyy.zzz> - 2020-11-12 08:06 -0800
  Re: Video Editing Savageduck <savageduck1@{REMOVESPAM}me.com> - 2020-11-12 09:57 -0800
    Re: Video Editing gtr <xxx@yyy.zzz> - 2020-11-12 10:52 -0800
  Re: Video Editing JF Mezei <jfmezei.spamnot@vaxination.ca> - 2020-11-12 14:17 -0500
    Re: Video Editing gtr <xxx@yyy.zzz> - 2020-11-12 11:45 -0800
    Re: Video Editing Jolly Roger <jollyroger@pobox.com> - 2020-11-12 19:50 +0000
      Re: Video Editing gtr <xxx@yyy.zzz> - 2020-11-12 12:04 -0800
  Re: Video Editing Jolly Roger <jollyroger@pobox.com> - 2020-11-12 19:26 +0000
    Re: Video Editing gtr <xxx@yyy.zzz> - 2020-11-12 12:07 -0800
  Re: Video Editing Lewis <g.kreme@kreme.dont-email.me> - 2020-11-13 10:22 +0000
    Re: Video Editing gtr <xxx@yyy.zzz> - 2020-11-13 12:26 -0800
      Re: Video Editing Jolly Roger <jollyroger@pobox.com> - 2020-11-13 21:06 +0000
        Re: Video Editing gtr <xxx@yyy.zzz> - 2020-11-13 14:01 -0800
          Re: Video Editing JF Mezei <jfmezei.spamnot@vaxination.ca> - 2020-11-14 04:14 -0500
            Re: Video Editing Jolly Roger <jollyroger@pobox.com> - 2020-11-14 15:35 +0000
              Re: Video Editing JF Mezei <jfmezei.spamnot@vaxination.ca> - 2020-11-14 12:45 -0500
                Re: Video Editing Jolly Roger <jollyroger@pobox.com> - 2020-11-14 17:55 +0000
                Re: Video Editing Lewis <g.kreme@kreme.dont-email.me> - 2020-11-14 18:46 +0000
      Re: Video Editing Lewis <g.kreme@kreme.dont-email.me> - 2020-11-14 01:12 +0000
  Re: Video Editing Alan Browne <bitbucket@blackhole.com> - 2020-11-13 11:36 -0500
    Re: Video Editing gtr <xxx@yyy.zzz> - 2020-11-13 12:24 -0800
      Re: Video Editing Alan Browne <bitbucket@blackhole.com> - 2020-11-13 19:38 -0500
        Re: Video Editing gtr <xxx@yyy.zzz> - 2020-11-13 22:46 -0800
          Re: Video Editing JF Mezei <jfmezei.spamnot@vaxination.ca> - 2020-11-14 04:30 -0500
            Re: Video Editing gtr <xxx@yyy.zzz> - 2020-11-15 08:43 -0800
          Re: Video Editing Alan Browne <bitbucket@blackhole.com> - 2020-11-14 09:56 -0500
            Re: Video Editing gtr <xxx@yyy.zzz> - 2020-11-15 08:46 -0800
              Re: Video Editing Alan Browne <bitbucket@blackhole.com> - 2020-11-15 12:03 -0500
                Re: Video Editing Lewis <g.kreme@kreme.dont-email.me> - 2020-11-15 18:25 +0000
                Re: Video Editing Alan Browne <bitbucket@blackhole.com> - 2020-11-15 13:39 -0500
    Re: Video Editing Lewis <g.kreme@kreme.dont-email.me> - 2020-11-14 00:59 +0000
      Re: Video Editing gtr <xxx@yyy.zzz> - 2020-11-13 22:47 -0800
        Re: Video Editing Lewis <g.kreme@kreme.dont-email.me> - 2020-11-14 10:01 +0000
      Re: Video Editing Alan Browne <bitbucket@blackhole.com> - 2020-11-14 09:35 -0500

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