[FFmpeg-user] Strange problem with creating chapters

[Paul B Mahol]

On Fri, Sep 17, 2021 at 9:34 PM Cecil Westerhof via ffmpeg-user <
ffmpeg-user at ffmpeg.org> wrote:

> Cecil Westerhof via ffmpeg-user <ffmpeg-user at ffmpeg.org> writes:
>
> When I put before the first chapter:
>     [CHAPTER]
>     TIMEBASE=1/1
>     START=1
>     END=2
>     title=
>
>
I think chapter metadata needs own command line option to work correctly.


> I get:
>     Input #1, ffmetadata, from 'evaluaties.txt':
>       Metadata:
>         title           : Improvisations
>       Duration: 00:16:35.00, start: 0.000000, bitrate: 0 kb/s
>         Chapter #1:0: start 1.000000, end 2.000000
>         Metadata:
>           title           :
>     .
>     .
>     .
>     Output #0, mp4, to '09-ImprovisatiesMetHoofdstukken.mp4':
>       Metadata:
>         title           : Improvisations
>         encoder         : Lavf58.45.100
>         Chapter #0:0: start 1.000000, end 2.000000
>         Metadata:
>           title           :
>
> and:
>     Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
> '09-ImprovisatiesMetHoofdstukken.mp4':
>       Metadata:
>         major_brand     : isom
>         minor_version   : 512
>         compatible_brands: isomiso2avc1mp41
>         title           : Improvisations
>         encoder         : Lavf58.45.100
>       Duration: 00:16:35.83, start: 0.000000, bitrate: 2434 kb/s
>         Chapter #0:0: start 0.000000, end 105.000000
>         Metadata:
>           title           :
>
> > I am playing with ffmpeg again. I got a few questions, so I will be
> > posting them in the near future.
> >
> > But I have one very strange problem that is kind of urgent.
> >
> > I have a metafile to create chapters. It works OK except for the first
> > chapter.
> >
> > My metafile starts with:
> >     ;FFMETADATA1
> >     title=Improvisations
> >
> >     [CHAPTER]
> >     TIMEBASE=1/1
> >     START=105
> >     END=239
> >     title=Just a test case
> >
> > When creating the file with the chapters I see:
> >     Input #1, ffmetadata, from 'evaluaties.txt':
> >       Metadata:
> >         title           : Improvisations
> >       Duration: 00:16:35.00, start: 0.000000, bitrate: 0 kb/s
> >         Chapter #1:0: start 105.000000, end 239.000000
> >                             ^^^^^^^^^^
> >         Metadata:
> >           title           : Just a test case
> >     .
> >     .
> >     .
> >     Output #0, mp4, to '09-ImprovisatiesMetHoofdstukken.mp4':
> >       Metadata:
> >         title           : Improvisations
> >         encoder         : Lavf58.45.100
> >         Chapter #0:0: start 105.000000, end 239.000000
> >                             ^^^^^^^^^^
> >         Metadata:
> >           title           : Just a test case
> >
> > But with ffprobe I am seeing:
> >     Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
> '09-ImprovisatiesMetHoofdstukken.mp4':
> >       Metadata:
> >         major_brand     : isom
> >         minor_version   : 512
> >         compatible_brands: isomiso2avc1mp41
> >         title           : Improvisations
> >         encoder         : Lavf58.45.100
> >       Duration: 00:16:35.83, start: 0.000000, bitrate: 2434 kb/s
> >         Chapter #0:0: start 0.000000, end 240.000000
> >                             ^^^^^^^^
> >         Metadata:
> >           title           : Just a test case
> >
> > What could be happening here?
> >
> > I am using Debian 11 and ffmpeg version 4.3.2-0+deb11u2.
> >
> > I could probably solve it with a dummy chapter of a second at the
> > beginning, but would prefer a better solution.
>
> --
> Cecil Westerhof
> Senior Software Engineer
> LinkedIn: http://www.linkedin.com/in/cecilwesterhof
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