[Bug 790115] New SMPTE 2086 meta API for partially supporting HDR

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790115

--- Comment #8 from Seungha Yang <pudding8757 at gmail.com> ---
(In reply to Arnaud Vrac from comment #7)
Thanks for your attention!

About RGB prefix, I tried to make them array like ffmpeg does, but I thought it
may be able to cause misunderstanding. As you know, hevc SEI message defines
that the ordering is GBR. But, ffmpeg changes the ordering to RGB in the array
structure. So I think explicit prefix naming can prevent the mistake. Also,
other spec like webm uses prefixed syntax for them. What do think about it?

I have plan to add CLL meta which was already implemented in ffmpeg v3.4
One minor reason I didn't report it now is... current ffmpeg version used by
gst-libav is v3.3.5 which includes only mastering meta. CLL meta was added in
v3.4.

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