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Video Editing

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  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
    Re: Video Editing Angus McGiver <somebody@somewhere.com> - 2020-11-13 12:06 -0500
      Re: Video Editing gtr <xxx@yyy.zzz> - 2020-11-13 12:25 -0800

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#45595 — Video Editing

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.

Any aid appreciated.

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#45596

On Nov 12, 2020, gtr wrote
(in article <rojmhs$eqc$1@dont-email.me>):

> 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.
>
> Any aid appreciated.

You haven’t mentioned the type of video file, or the source (recording device, sometimes the manufacturer provides proprietary editing software).

Since you have a Mac you already have something which will do the job, but not quite as simply as "*type in a starting time code and and ending time code*” You will have to do a bit of editing.

Quicktime Player (Edit->Trim, etc.)
iMovie

...and if you want to up your game a tad there is the free *DaVinci Resolve* which does require climbing a learning curve.

-- 
Regards,
Savageduck

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#45597

On 2020-11-12 17:57:19 +0000, Savageduck said:

> On Nov 12, 2020, gtr wrote
> (in article <rojmhs$eqc$1@dont-email.me>):
> 
>> 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.
>> 
>> Any aid appreciated.
> 
> You haven’t mentioned the type of video file, or the source (recording 
> device, sometimes the manufacturer provides proprietary editing 
> software).

Any file format that will let me type in timings.

> Since you have a Mac you already have something which will do the job, 
> but not quite as simply as "*type in a starting time code and and 
> ending time code*” You will have to do a bit of editing.

And that's the only consideration that has me asking the question here. 
 I have three or four ways to do it I want to spend 20 minutes with a 
mouse.

> Quicktime Player (Edit->Trim, etc.)
> iMovie

Right, and Screenflow and a few others.

> ...and if you want to up your game a tad there is the free *DaVinci 
> Resolve* which does require climbing a learning curve.

I have it and it does indeed look like a lot of preliminary study.  Do 
you know if it will
let me type in timings?

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#45598

On 2020-11-12 11:06, gtr 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. 


ffmpeg is your friend.

> ffmpeg -i input.mov -ss 00:15:12 -t 00:00:30 -acodec copy -vcodec copy output.mov


Only difference is that you specify start time (ss) and duration (t)
instead of end time.  It is the swiss army knife of handling video files
and formats.

It is open source and there are binaries available for OS-X (sorry don't
have link handy).


You can then use bash to create a script to process the list of files
you need.


(I think it is able to concatenate 2 video files but not sure).

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#45600

On 2020-11-12 19:17:01 +0000, JF Mezei said:

> On 2020-11-12 11:06, gtr 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.
> 
> 
> ffmpeg is your friend.
> 
>> ffmpeg -i input.mov -ss 00:15:12 -t 00:00:30 -acodec copy -vcodec copy 
>> output.mov
> 
> 
> Only difference is that you specify start time (ss) and duration (t)
> instead of end time.  It is the swiss army knife of handling video files
> and formats.

I'm well aware of it, and thought I recalled a UI that made it easily 
done. I even went and purchased FF-Works to make it more accessible, 
but couldn't manage to find it in there anywhere.

> It is open source and there are binaries available for OS-X (sorry don't
> have link handy).
> 
> 
> You can then use bash to create a script to process the list of files
> you need.
> 
> 
> (I think it is able to concatenate 2 video files but not sure).

I see "merge", so assume it can do that as well, but it's not what I'm 
looking for just now.  Thanks!

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#45601

On 2020-11-12, JF Mezei <jfmezei.spamnot@vaxination.ca> wrote:
> On 2020-11-12 11:06, gtr 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. 
>
> ffmpeg is your friend.
>
>> ffmpeg -i input.mov -ss 00:15:12 -t 00:00:30 -acodec copy -vcodec
>> copy output.mov
>
> Only difference is that you specify start time (ss) and duration (t)
> instead of end time.

The -to switch lets you specify an end time.

-- 
E-mail sent to this address may be devoured by my ravenous SPAM filter.
I often ignore posts from Google. Use a real news client instead.

JR

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#45602

On 2020-11-12 19:50:16 +0000, Jolly Roger said:

> On 2020-11-12, JF Mezei <jfmezei.spamnot@vaxination.ca> wrote:
>> On 2020-11-12 11:06, gtr 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.
>> 
>> ffmpeg is your friend.
>> 
>>> ffmpeg -i input.mov -ss 00:15:12 -t 00:00:30 -acodec copy -vcodec
>>> copy output.mov
>> 
>> Only difference is that you specify start time (ss) and duration (t)
>> instead of end time.
> 
> The -to switch lets you specify an end time.

Cool!

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#45599

On 2020-11-12, 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.
>
> Any aid appreciated.

Sounds like a job for a script to me. 

You can use the -ss and -to switches with the ffmpeg command-line tool
to trim video files with time codes. Read the manual for details and
examples. There are also plenty of tutorials on the web about it.

It would relatively trivial to write a little script (AppleScript, Ruby,
Perl, shell, whatever) that reads a list of video names/paths along with
the appropriate time codes from a text file and then invoke ffmpeg with
the right parameters to do the splicing.

-- 
E-mail sent to this address may be devoured by my ravenous SPAM filter.
I often ignore posts from Google. Use a real news client instead.

JR

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#45603

On 2020-11-12 19:26:48 +0000, Jolly Roger said:

> On 2020-11-12, 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.
>> 
>> Any aid appreciated.
> 
> Sounds like a job for a script to me.
> 
> You can use the -ss and -to switches with the ffmpeg command-line tool
> to trim video files with time codes. Read the manual for details and
> examples. There are also plenty of tutorials on the web about it.
> 
> It would relatively trivial to write a little script (AppleScript, Ruby,
> Perl, shell, whatever) that reads a list of video names/paths along with
> the appropriate time codes from a text file and then invoke ffmpeg with
> the right parameters to do the splicing.

That might be a good educational project for the Autumn.

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#45605

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-


-- 
"Why do you wear that stupid bunny suit?" "Why are you wearing that
	stupid man suit?"

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#45610

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

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#45611

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

-- 
E-mail sent to this address may be devoured by my ravenous SPAM filter.
I often ignore posts from Google. Use a real news client instead.

JR

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#45613

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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#45622

note: I have found that by using -vcodec h264 and -acodec ac3 or aac
with ffmpeg  will used up mega CPU and is slower. BUT: by going frame be
frame, it can start the copy operation at the precise time you specified
for both video and audio.  If you don't specify it, the operation is
much faster, but the output may be without sound until it hits the next
keyframe, same with video.

This matters when you really want precise start of the output video.

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#45629

On 2020-11-14, JF Mezei <jfmezei.spamnot@vaxination.ca> wrote:
> note: I have found that by using -vcodec h264 and -acodec ac3 or aac
> with ffmpeg  will used up mega CPU and is slower.

That's because you are instructing ffmpeg to re-encode with those codecs
rather than "-*codec copy" which streams the content as-is and is much
faster as a result.

-- 
E-mail sent to this address may be devoured by my ravenous SPAM filter.
I often ignore posts from Google. Use a real news client instead.

JR

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#45630

On 2020-11-14 10:35, Jolly Roger wrote:
> On 2020-11-14, JF Mezei <jfmezei.spamnot@vaxination.ca> wrote:
>> note: I have found that by using -vcodec h264 and -acodec ac3 or aac
>> with ffmpeg  will used up mega CPU and is slower.
> 
> That's because you are instructing ffmpeg to re-encode with those codecs
> rather than "-*codec copy" which streams the content as-is and is much
> faster as a result.


Opposite: I found that by forcing the re-encode, I got the output video
to start 100% OK at the time mark. When you don't do this via the
"copy", it starts to copy frame information at the right frane, but the
output video contains "out of context" compressed data for the first
frames because it doesn't start with a keyframe.

When you force re-encode, t has in memory a full frame for each frame so
when it gets to desired start frame, it has a full frame to begin with
and can then continue with only changes to each frame until the next
keyframe.

Same with audio.

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#45631

On 2020-11-14, JF Mezei <jfmezei.spamnot@vaxination.ca> wrote:
> On 2020-11-14 10:35, Jolly Roger wrote:
>> On 2020-11-14, JF Mezei <jfmezei.spamnot@vaxination.ca> wrote:
>>> note: I have found that by using -vcodec h264 and -acodec ac3 or aac
>>> with ffmpeg  will used up mega CPU and is slower.
>> 
>> That's because you are instructing ffmpeg to re-encode with those codecs
>> rather than "-*codec copy" which streams the content as-is and is much
>> faster as a result.
>
> Opposite

Nope. Everything I said above is true.

-- 
E-mail sent to this address may be devoured by my ravenous SPAM filter.
I often ignore posts from Google. Use a real news client instead.

JR

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#45632

In message <eJUrH.1184696$DO2.419180@fx45.iad> JF Mezei <jfmezei.spamnot@vaxination.ca> wrote:
> On 2020-11-14 10:35, Jolly Roger wrote:
>> On 2020-11-14, JF Mezei <jfmezei.spamnot@vaxination.ca> wrote:
>>> note: I have found that by using -vcodec h264 and -acodec ac3 or aac
>>> with ffmpeg  will used up mega CPU and is slower.
>> 
>> That's because you are instructing ffmpeg to re-encode with those codecs
>> rather than "-*codec copy" which streams the content as-is and is much
>> faster as a result.


> Opposite: I found that by forcing the re-encode, I got the output video
> to start 100% OK at the time mark. When you don't do this via the
> "copy", it starts to copy frame information at the right frane, but the
> output video contains "out of context" compressed data for the first
> frames because it doesn't start with a keyframe.

This is because you don't know what you are doing.

-- 
Up the airy mountains, down the rushy glen... From ghosties and
	bogles and long-leggity beasties... My mother said I never
	should... We dare not go a-hunting for fear... And things that go
	bump... Play with the fairies in the wood... --Lords and Ladies

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#45617

In message <romq5u$rub$3@dont-email.me> 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


There are many many (hundreds?) of options that you can add to ffmpeg

Here is a recent commandline:

ffmpeg -i maskred.mp3 -ss 42 -metadata author="Edgar Allan Poe" -metadata album="The Masque of the Red Death" -metadata comment="The story follows Prince Prospero's attempts to avoid a dangerous plague, known as the Red Death, by hiding in his abbey. He, along with many other wealthy nobles, hosts a masquerade ball in seven rooms of the abbey, each decorated with a different color. In the midst of their revelry, a mysterious figure disguised as a Red Death victim enters and makes his way through each of the rooms." -b:a 128K -c:a aac  "The Masque of the Red Death.m4b"

or this

for i in *; do ffmpeg -n -f concat -safe 0 -i <(for f in $i/*.mp3; do echo "file '$PWD/$f'"; done) -metadata title="$i" -vn -c:a aac -b:a 64K  $i.m4a ; done

or

ffmpeg -i rolf.mp4 -ss 8:37 -to 8:41 rolf2.mp4

or

ffmpeg -i Witches\ 01.mp3 -i Witches\ 02.mp3 -i Witches\ 03.mp3 -i Witches\ 04.mp3 -i Witches\ 05.mp3 -i Witches\ 06.mp3 -i Witches\ 07.mp3 -metadata title="Witches" -metadata comment-"Recorded 16 Jul 1999" Witches.mp3

(just pulled from my `history`)

-- 
When this kiss is over it will start again But not be any different
	could be exactly the same It's hard to imagine that nothing at
	all Could be so exciting, could be this much fun

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#45606

On 2020-11-12 11:06, gtr 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.

Handbrake does that - perhaps not to "time code" level, but at least to 
seconds or frames in whatever range you need.

-- 
"...there are many humorous things in this world; among them the white
  man's notion that he is less savage than the other savages."
                                             -Samuel Clemens

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