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2014
12-12

Speed testing of x265 codec

We did some testing to assess progress in the development of codec x265. How encoding rate was changed for different presets from version to version? Testing was performed on the following config: Intel (R) Core (TM) i7-4930K CPU @ 3.40GHz, 32 GB DDR3. We encoded the same test video file (1080p @ 25fps) on different presets and measured the average FPS.

x265 Versions:
1.0, 1.1, 1.2, 1.3, 1.4
Tested presets:
DEFAULT - run without parameters
CRF-20 – run with key -CRF 20 without any other parameters
ultrafast, superfast, veryfast, faster, fast, medium, slow, slower, veryslow, placebo – defined only -preset “…”
Compilers:
GCC 4.9.2, ICC 1400, MSVC 1800

Below is a summary table and graphics:

ver. comp iler DEF AULT CRF -20 ultra fast super fast very fast faster fast medium slow slower veryslow placebo
1.0 GCC 4.9.2 4.50 4.08 10.94 7.00 6.93 7.84 7.97 4.72 2.45 0.52 0.35 0.20
1.0 ICC 1400 4.76 4.10 10.82 6.62 6.56 7.62 7.90 4.74 2.42 0.51 0.35 0.20
1.0 MSVC 1800 4.76 4.14 11.44 6.97 6.92 7.95 8.08 4.78 2.46 0.54 0.35 0.20
1.1 GCC 4.9.2 8.07 6.44 13.12 9.30 8.81 10.29 8.69 8.07 2.40 0.51 0.34 0.20
1.1 ICC 1400 8.11 6.48 13.10 9.13 8.72 10.26 8.74 8.14 2.37 0.51 0.34 0.20
1.1 MSVC 1800 8.11 6.58 13.82 9.61 9.12 10.64 8.87 8.26 2.41 0.54 0.34 0.20
1.2 GCC 4.9.2 9.02 7.40 15.06 12.18 11.44 12.26 11.06 8.82 2.62 0.58 0.39 0.24
1.2 ICC 1400 9.02 7.42 14.88 11.96 11.16 12.17 10.91 8.83 2.60 0.57 0.39 0.24
1.2 MSVC 1800 9.02 7.53 15.44 12.68 11.83 12.68 11.32 8.99 2.69 0.61 0.39 0.24
1.3 GCC 4.9.2 8.88 7.29 15.24 12.85 12.00 12.77 11.57 8.88 2.60 0.59 0.39 0.24
1.3 ICC 1400 8.95 7.48 14.92 12.56 11.81 12.69 11.64 8.95 2.58 0.59 0.39 0.24
1.3 MSVC 1800 8.95 7.55 16.13 13.25 12.53 13.30 11.97 9.13 2.62 0.61 0.39 0.24
1.4 GCC 4.9.2 9.32 7.47 17.95 13.92 12.25 13.09 11.66 9.33 2.64 0.73 0.51 0.32
1.4 ICC 1400 9.41 7.67 17.78 13.72 12.19 13.21 11.78 9.42 2.62 0.73 0.51 0.32
1.4 MSVC 1800 9.41 7.63 18.42 14.34 12.58 13.44 11.92 9.48 2.65 0.74 0.51 0.32

Speed testing of x265 codec - 第1张  | 资料库吧
Speed testing of x265 codec - 第2张  | 资料库吧
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This chart shows a comparison of the encoding rate for different x265 (ver. 1.4) presets
Speed testing of x265 codec - 第13张  | 资料库吧

Conclusion:
1) Encoding speed in version 1.4 compared to version 1.0 has increased x1.5-2 times.
2) Powerful computer still fails to encode in real time, even on the fastest presets.
3) Preset medium is optimal for coding. Much faster than slow, placebo, etc. and not much inferior in speed even with ultrafast.
4) The difference is not significant, but on the test stand the fastest x265 assembly was made with Microsoft Visual C.

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