[Bug 783591] openjpegdec: doesn't support grayscale with alpha

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783591

--- Comment #20 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
See GST_VIDEO_FLAG_PREMULTIPLIED_ALPHA. While this can be put into a
GstVideoInfo, there's nothing that does anything meaningful with it for your
case. It would have to be added to the caps or to the GstVideoMeta somehow to
be useful.

Without such changes, only non-premultiplied alpha is supported currently.

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