[Bug 752958] vaapidecode: cannot detect and output NV12

[GStreamer (GNOME Bugzilla)]

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

--- Comment #17 from sreerenj <bsreerenj at gmail.com> ---
Created attachment 321820
  --> https://bugzilla.gnome.org/attachment.cgi?id=321820&action=edit
vaapidecode: Delay the output format setting until we have a decoded surface

This will help to consolidate the out caps negotiation to a single place,which
will make the code simpler, allows to get the exact decoded format if needed
and the selected chroma type too.

We need a proper regression testing for this since it may seriously affect many
pipelines especially when it decode multi resolution videos.

This will help to simplify the fixes for #753914 and #759181...

Added the patch here since Victor's  upcoming patch might needs to rebase on
top of this :)

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