[Bug 752958] vaapidecode: cannot detect and output NV12

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752958

--- Comment #14 from Julien Isorce <julien.isorce at gmail.com> ---
(In reply to Víctor Manuel Jáquez Leal from comment #12)
> After sketching these patches, if found out that the context's available
> formats (vaQuerySurfaceAttributes()) in the intel backend is also NV12 only.
> 
> Intersecting with vaQueryImageFormats() won't help.

Hi Victor, that's great that you looked at this bug. But would you mind to
clarify your 2 last comments (#12 and #13). It looks to me that in first hand
you are saying the intersection is not useful because vaQuerySurfaceAttributes
returns always NV12 with intel vaapi backend. But then in your comment #13 you
are pointing the function that actually shows that intel vaapi backend does not
always return NV12 since it can return I420 depending on the hardware. Which
would make the intersection actually useful. What am I missing ? :)

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