[Bug 765795] glimagesink: support video frame rotation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765795

--- Comment #13 from Matthew Waters (ystreet00) <ystreet00 at gmail.com> ---
(In reply to Haihua Hu from comment #12)
> On some embed system, adding glvideoflip to glimagesinkbin will definitely
> cost performance downgrade. For example on my imx6Q. You mean we also could
> use transform matrix in vertex shader to get rotation effect? Use a property
> to control it?

yes, use what's already there, i.e. the GstVideoAffineTransformationMeta.

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