Request for guidance on improving GstDiscoverer

[Thibault Saunier]

Hello,

You can have a look at the validate media descriptor writer[0] where we
basically parse the whole file to detect all frames. Nowadays we should use
parsebin for that instead of decodebin and that tool should probably be
updated but we could add those feature in the discoverer doing something
similar to that.

I think we should basically rewrite GstDiscover around parsebin so that it
stops decoding and instead parse files, this way we could have flags to
tell how much parsing we want.

- Thibault

[1]
https://gitlab.freedesktop.org/gstreamer/gst-devtools/-/blob/master/validate/gst/validate/media-descriptor-writer.c

On Tue, May 19, 2020 at 3:59 PM David Ing <ding at panopto.com> wrote:

> I am interesting in adding some features to the GstDiscoverer, to allow it
> to operate in a mode which could discover more information about a media
> file.
>
> For example, I would like it to discover:
>
>    - For each stream
>       - Duration
>       - First Timestamp
>       - Last Timestamp
>       - Framerate variance
>       - Framerate min
>       - Framerate max
>       - Any changes to screen geometry, and the time at which this change
>       occurred
>
> I am particularly interested in the highlighted item.
>
> Can anyone provide pointers as to how I would go about detecting the
> changes in screen geometry (and the relevant timestamp).  Details would be
> nice.
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>
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