Quote:
Originally Posted by tal.aloni
other improvements, like copying the decoded frame back to main memory and performing full post-processing fast enough to handle 24 1080p frames per second, require hardware architecture that can only be found on very recent systems, and those systems can decode H.264 without DXVA assistance.
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FWIW, whether copying decoded frames back to main memory is feasible depends mostly on the GPU. It seems that newer nVidia GPUs can do that very quickly. While all ATI and Intel GPUs are extremely slow doing that. I've just created a benchmark program for that and asked madVR users to test it. I've seen nVidia GPUs "download" NV12 1080p textures from GPU to main memory with up to 600fps. In contrast, all ATI and Intel GPU benchmarks are slower than the needed 24fps. The highest ATI result I have is 5fps.