Metadata into MXF

[Jacob Visser]

Hi,

I want to add a metadata track to a MXF file. I've quickly studied the MXF-plugin code and it seems like there is support(?) for a metadata track, but it is unclear to me how its used.

The final goal is to implement a plugin that generates per-frame-metadata which needs to be in sync with video. I would like to know how, and what kind of metadata the MXF plugins expects (Tags?). Or needs some sort of metadata pad to be created?

It would be highly appreciated if anyone can provide me some directions.

Thanks!

Jacob Visser

 

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[Sebastian Dröge-3]

On Wed, 2017-04-12 at 13:33 +0000, Jacob Visser wrote:

> Hi,
>
> I want to add a metadata track to a MXF file. I've quickly studied
> the MXF-plugin code and it seems like there is support(?) for a
> metadata track, but it is unclear to me how its used.
>
> The final goal is to implement a plugin that generates per-frame-
> metadata which needs to be in sync with video. I would like to know
> how, and what kind of metadata the MXF plugins expects (Tags?). Or
> needs some sort of metadata pad to be created? 
>
> It would be highly appreciated if anyone can provide me some
> directions. 

(Generic) metadata support is not available in the MXF muxer/demuxer
currently. I started implementing something years ago but never got to
finish it, and it was not needed by anything I was using MXF for
either.

Which metadata scheme do you plan do use, and would you be interested
in working on adding support for that?

--
Sebastian Dröge, Centricular Ltd · http://www.centricular.com
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[Jacob Visser]

>(Generic) metadata support is not available in the MXF muxer/demuxer
>currently. I started implementing something years ago but never got to
>finish it, and it was not needed by anything I was using MXF for
>either.

>Which metadata scheme do you plan do use, and would you be interested
>in working on adding support for that?

I do not have any scheme in mind yet, as  MXF is still a bit unclear to me. Maybe we can have some direct chat about how to get into this?

~Jacob Visser

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[Sebastian Dröge-3]

On Thu, 2017-04-13 at 12:31 +0000, Jacob Visser wrote:
> >(Generic) metadata support is not available in the MXF muxer/demuxer
> >currently. I started implementing something years ago but never got to
> >finish it, and it was not needed by anything I was using MXF for
> >either.
>
> >Which metadata scheme do you plan do use, and would you be interested
> >in working on adding support for that?
> I do not have any scheme in mind yet, as  MXF is still a bit unclear
> to me. Maybe we can have some direct chat about how to get into this?

What metadata do you want to store/read?

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Sebastian Dröge, Centricular Ltd · http://www.centricular.com
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[Jacob Visser]

> On Thu, 2017-04-13 at 12:31 +0000, Jacob Visser wrote:
> > >(Generic) metadata support is not available in the MXF muxer/demuxer
> > >currently. I started implementing something years ago but never got to
> > >finish it, and it was not needed by anything I was using MXF for
> > >either.
> > 
> > >Which metadata scheme do you plan do use, and would you be interested
> > >in working on adding support for that?
> > I do not have any scheme in mind yet, as  MXF is still a bit unclear
> > to me. Maybe we can have some direct chat about how to get into this?

> What metadata do you want to store/read?

I would like to store and read per-frame metadata, such as VBI/VANC in SDI. For example to store GPS time and position stamps.

~Jacob Visser

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[Sebastian Dröge-3]

On Fri, 2017-04-14 at 09:56 +0000, Jacob Visser wrote:
> >
> > What metadata do you want to store/read?
> I would like to store and read per-frame metadata, such as VBI/VANC
> in SDI. For example to store GPS time and position stamps. 

As a first step you'll then have to search for MXF / KLV metadata specs
that define how to store the information you want to store. Unless you
want to go with a custom format that nobody else can read.

In any case you first need to know what exactly you want to store. MXF
allows storing arbitrary information, global but also per frame.

--
Sebastian Dröge, Centricular Ltd · http://www.centricular.com
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