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You can see nVidia's hardware support here: https://developer.nvidia.com/video-encode-and-decode-gpu-sup...
The take-away is that nVidia only has hardware support for AV1 on the RTX 3000 Ampere series cards.
Intel supported AV-1 decoding in its Xe-LP GPUs in 2020.
Intel also reached v1.0.0 of its open-source codec 2 weeks age, here: https://github.com/AOMediaCodec/SVT-AV1
I am not aware of any other CPU or GPU that has an AV-1 codec built in.
cpu-used is (somewhat confusingly) not for how many threads it uses, but how good the quality of the video should be in a scale from 0 to 9, where 0 is best quality and slowest, and 9 is worst quality and fastest. Very similar to how -preset was used for x264.
https://github.com/AOMediaCodec/community/wiki#how-to-make-e... explains the different settings that most change the speed of encoding.
AV1 v1 happened 4 years ago, not 18 days ago. SVT is Intel's encoder.
https://aomedia.googlesource.com/aom/+/refs/tags/v1.0.0
https://github.com/AOMediaCodec/av1-spec/releases/tag/v1.0.0