[Libav-user] x265 HVEC much slower on AMD than Intel

Dave ffmpeg at dgmm.net
Fri Oct 13 01:44:03 EEST 2017

On Thursday 12 October 2017 14:05:50 Carl Eugen Hoyos wrote:
> 2017-10-10 23:06 GMT+02:00 Dave <ffmpeg at dgmm.net>:
> > The most obvious difference when running ffmpeg are the following lines
> > On Intel box
> > x265 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
> >
> > On AMD box
> > x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT
> This indicates that the Intel cpu can at least be much more efficient
> and that higher throughput is no surprise.

Thanks Carl.  I was fairly confident that those instruction set extensions
would be the prime reason for the difference, so I guess the only option
is to build a new box with the "right" CPU.

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