[Bug 772151] vaapi: gst_vaapi_video_memory_map() should ignore unknown mapping flags

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772151

--- Comment #3 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
More info. This is interesting.

Neither GstVideoFilter nor GstGamma propose bufferpool allocation with
GST_VIDEO_META_API_TYPE. And vaapi elements won't add GstVideMeta to its
buffers if the buffer pool config doesn't have  GST_VIDEO_META_API_TYPE in the
allocation query.

*But*, the vaapi base class adds the GstVideoMeta if the allocations caps are
different from the negotiation caps. That is why, under certain resolutions,
the mapping works.

Again, two options:

a) GstVideoFill shall always add in propose allocation's query the
GST_VIDEO_META_API_TYPE

or

b) Vaapi base class shall always add the GstVideoMeta on its downstream frames.

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