[Bug 790023] matroskademux: Add parsing Colour element

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790023

--- Comment #3 from Seungha Yang <pudding8757 at gmail.com> ---
(In reply to Sebastian Dröge (slomo) from comment #2)
> Review of attachment 363155 [details] [review]:
> 
> Is there also something for stereoscopic video information (left-right,
> top-bottom, etc)? Looks generally good in any case

The Colour element has no stereoscopic video info, but has more color specific
(chroma subsampling, HDR, etd) info which I didn't add in the patch (because
the missing parts are not supported in gstreamer AFAIK). Actually, the missing
feature in gstreamer is color mastering information which is essential for HDR
support. Please refer to
https://github.com/FFmpeg/FFmpeg/blob/master/libavutil/mastering_display_metadata.h

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