[Bug 766048] Add VP9 Encoding support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766048

--- Comment #10 from sreerenj <bsreerenj at gmail.com> ---
(In reply to Tim-Philipp Müller from comment #9)
> In "Define max width and height" you changed the values as well - it would
> be nice to mention why in the commit message next time :)

Yup, will do :)

In theory we can have a max resolution as indicated in
max_frame_width/max_frame_height and then it is possible to dynamically change
the frame resolution of each frame. But we are not supporting this yet. So i
just defined a hard limit for now based on what the driver currently supports
for the specific platform(KBL [1]) which is 4k. The initial values 8k were used
by some sample test cases i have seen in libva which is wrong as per the
current vaapi-intel-driver implementation.

[1]: https://en.wikipedia.org/wiki/Kaby_Lake

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