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vaQueryImageFormats() returns a randomly ordered list - so we shouldn't assume the first format on the list which works is the best. This effectively switches to nv12 instead of yuv420p on some drivers. We handle this by reusing va_to_imgfmt[], and ordering it by preference. We hardcode that GPUs prefer nv12 pver yuv420p. In theory we could do complicated probing (allocate dummy surface + use vaDeriveImage on it, then retrieve the FourCC) - but all things which could break assumption in the future are not supported yet (like 10 bit or 4:4:4), so this is fine.