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There's quite a bit of info about using hardware encoder built in Kepler-based and newer NVidia cards to encode video. As far as I understood all of them just pass the encoding to hardware encoder, without actually using CUDA. What I am trying to achieve is to accelerate video encoding using plain old CUDA on old pre-Kepler hardware (GTX 570 here, Fermi).

Is it possible at all?

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Not possible. It's only via NVENC. See https://trac.ffmpeg.org/wiki/HWAccelIntro#CUDACUVIDNVDEC

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