[Bug 752958] vaapidecode: cannot detect and output NV12

[GStreamer (GNOME Bugzilla)]

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

--- Comment #13 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
I have checked a couple of backends (intel, mesa and the old vdpau):

* mesa VA tracker - it always returns NV12
* vdpau backend - it fallbacks the default VA implementation which always
returns NV12
* intel backend:
https://cgit.freedesktop.org/vaapi/intel-driver/tree/src/i965_drv_video.c#n5356
(decoders only)

|----------+-------+------------------------------------------|
| G4X      | MPEG2 | I420                                     |
|----------+-------+------------------------------------------|
| ILK      | MPEG2 | I420                                     |
|          | H264  | I420                                     |
|----------+-------+------------------------------------------|
| GEN6     | *     | NV12                                     |
|----------+-------+------------------------------------------|
| GEN7     | JPEG  | IMC3, IMC1, Y800, 411P, 422H, 422V, 444P |
|          | HEVC  | P010                                     |
|          | rest  | NV12                                     |
|----------+-------+------------------------------------------|
| GEN{8,9} | JPEG  | IMC3, IMC1, Y800, 411P, 422H, 422V, 444P |
|          | rest  | NV12                                     |
|----------+-------+------------------------------------------|

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