VDPAUVideo Decode and Presentation API (Application Programming Interface) for Unix
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b) If a new standard were adopted other than VDPAU, will Nvidia support it?
Q) How does using VDPAU differ from using CUDA to accelerate the same video decoding functions?
Nvidia: VDPAU uses the dedicated video hardware within the GPU to perform the video decode, while using CUDA to accelerate video decode executes the decode algorithms on the general processing cores of the GPU.