[Bug 773709] player: Add get video thumbnail API

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773709

--- Comment #11 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to Lyon from comment #10)
> The original thought of adding this thumbnail API is coming from get the
> thumbnail for video preview before open it to play (and add the seek
> position is because usually at the beginning of the film, there will be all
> black frames for several seconds ).
> 
> It is kind like media info for the video stream, but then I find it is not
> very proper to add this API in the media-info interface, as it is not the
> information got from media information data.
> So I add this API at gstplayer API 

I'd like to have this integrated into GstDiscoverer somehow, or probably rather
as a separate thumbnailing API.

> The reason I use structure is that for setting
> type/width/height/par_n/par_d, there seems too many parameter for the
> function.

We could make it two probably: the enum and an optional GstStructure for
"additional configuration"

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