An image with fourcc==Y800 can be created by vaDeriveImage() but Y800 isn't returned by vaQueryImageFormats() and isn't accepted by vaCreateImage(), doesn't work in vaPutImage(), &c. Support Y800 in all Image apis.
The image fourcc returned by vaQueryImageFormats() must be supported supported by vaCreateImage()/vaGetImage()/vaPutImage(). but the image fourcc returned from vaDeriverImage() might not be included in the image list returned from vaQueryImageFormats().
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