Quote:
Originally Posted by roozhou
I wonder why x264 ran so slowly with --preset ultrafast on a Quad-core.
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Probably due to decoding speed. Unfortunately it is unclear which decoders were used. If either the source was uncompressed or at least DXVA+readback was used for x264 or the source used some format that the GPU can't accelerate it might make some sense as an encoder comparison so far the main conclusions is: A fast GPU can decode H.264 a lot faster than a slow CPU with some random (probably single-threaded) decoder. Not exactly news. And not in any way related to x264.