Creating a dedicated per frame metadata stream?

[pisymbol .]

Here is what I'd like to do:

I have a *live* source that is capturing video. What I'd like to do is create a multistream file, say an MLV, where one stream is the actually video while another is a data stream essentially of per fram metadata (think timestamps and other sensory data at the time of capture).

I know vendors like GoPro do this: They basically create I think a complimentary audio stream that is actually metadata but I'm not exactly sure how. I've also seen other smaller third-paty do something similar with video overlay.

Has anyone done this before using GStreamer? If so, can you give me a little guidance on how that would work? Is this a custom plugin or are there exiting primitives I could exploit?

Thanks!

-aps

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[Arjen Veenhuizen]

You could take a look at KLV (Key-Length-Value) metadata. Support for it is
pretty good in recent GStreamer versions.



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[pisymbol .]

On Thu, Aug 29, 2019 at 9:39 AM Arjen Veenhuizen <[hidden email]> wrote:

You could take a look at KLV (Key-Length-Value) metadata. Support for it is
pretty good in recent GStreamer versions.

Wow, thanks so much for your response. Can you point me to a resource? I don't understand what is KLV? Is that a GstMeta abstraction?

-aps

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