[Bug 752958] vaapidecode: cannot detect and output NV12

[GStreamer (GNOME Bugzilla)]

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

--- Comment #16 from sreerenj <bsreerenj at gmail.com> ---
As a related topic, I wondering whether it is good to delay the src caps
setting (set_output_state()) until we finish the decoding of first frame.
So that we can extract the format of the decoded surfaces..
otherwise we need some hook code again for non yuv420 format, at least a utiity
method to get chroma-subsamplinng-type from decoder and corresponding
manipulations. For the formats like P010 (any format having more than 8 bits
per component), I won't prefer to use I420 as the default surface download
format.

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