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Again, that doesn't mean that DXVA is not doing its job, it just means that we are progressing to another standard.
I certainly wont miss DXVA, its always been problematic for people to get it working. A programming interface like CUDA is much to be prefered, but only if it becomes standardized so that it is the same for all GPUs.
CUDAs side "effect" is that it wont ever be as efficient as DXVA is as the decoded video frames will be always needed to be transfered from the GPU to CPU memory and the back again (maybe some optimisations can be done in cases where the video codec is last codec in the filter chain but not in any other case. I'm also not sure if this is even possible ).