[Bug 624697] Add 'video/x-raw-va' in DEFAULT_RAW_CAPS for va api support

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=624697
  GStreamer | gst-plugins-base | unspecified

--- Comment #9 from Zhao, Halley <halley.zhao at intel.com> 2012-09-12 08:07:58 UTC ---
gstreamer-vaapi works in playbin2: https://gitorious.org/vaapi/gstreamer-vaapi.
so, you can close it if you like.

however, I don't think it works perfect now, because:
auto-plug ends when a sink element is connected (vaapisink), not by pre-defined
caps type.
maybe we can add 'video/x-surface;' to the list.

use raw_caps (default one or set from app) to control auto-plug is more
flexible than ends with a sink element. for example: we sometimes do require
raw caps, thumbnail generation is one case. in such case vaapidownload element
can be auto-pluged to get the raw data of a hw surface.

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