poor x265 conversion speed

truegenius

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Oct 22, 2011
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hey there,
so x265 is out and is supported by handbrake, so i was thinking to use it to convert videos into x265 format
so i took a 720p 30fps 6mbps 30second video and started to convert it into 256kbps ( video bitrate ) x265 format
quality was acceptable considering the bitrate, but it took over 1 hour to do complete the task using 1090t @3.6GHz.
after checking some anandtech's benchmark i found that 1090t/1100t is listed at the bottom of the performance chart ( even slower than A8-6500T 2.1ghz ) http://www.anandtech.com/bench/CPU/1061

considering that 1090t is much faster than 6500t and have more cores too so 1090t should have performed much better than this.
can someone explain why 1090t is so much behind?
does x265 in handbrake use some instruction which are not present in 1090t? if yes then which one ?
 

randomizer

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Neither of those CPUs are particularly fast, but the 6500T has the advantage of AVX extensions. The 1090T is from an earlier generation. Unfortunately you'll need to spend some cash to do any serious encoding with x265 at the moment. It's abysmally slow on even the most powerful processors. x264 is still a better option for anything but low bitrate encodes or people with lots of patience.
 

randomizer

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Neither of those CPUs are particularly fast, but the 6500T has the advantage of AVX extensions. The 1090T is from an earlier generation. Unfortunately you'll need to spend some cash to do any serious encoding with x265 at the moment. It's abysmally slow on even the most powerful processors. x264 is still a better option for anything but low bitrate encodes or people with lots of patience.
 

truegenius

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so its solved and the reason is exactly as you stated
just to add more info
after some research, i found that x265 don't use anything above sse2 of 1090t ( though it support sse3 too ) and sse2 provides ~25% performance boost in comparison to mmx+
x265 uses can avx2 too, though performance increases very significantly upto sse4.2

btw any way to accelerate transcoding using gpu ( some software )
i have hd7950
 
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