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19th March 2018, 19:09 | #1 | Link |
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"Visual-lossless" comparison x264 x265
"Visual-lossless" comparison x264 x265 8bit
x265 2.7+14 vs x264 r2851 source: crowd_run_2160p50.y4m (60 frames) + park_joy_2160p50.y4m (60 frames) + in_to_tree_2160p50.y4m (60 frames) Code:
a=rawsourceplus("crowd_run_2160p50.y4m").trim(1,60) b=rawsourceplus("park_joy_2160p50.y4m").trim(1,60) c=rawsourceplus("in_to_tree_2160p50.y4m").trim(1,60) a+b+c ConvertToRGB(chromaresample="spline64") Spline64Resize(1920,1080) ConvertToYV12(chromaresample="spline64") AssumeFPS(30) avs2yuv64.exe raw.avs -o raw_1080p30.y4m x264 --level 4.1 --preset placebo --bitrate 20000 --me umh --bframes 8 --psy-rd 1.1:0.20 --aq-mode 3 --pass 1/2 -o 264.h264 raw_1080p30_2.y4m Encode files: https://yadi.sk/d/tr0z84A63TTY5b apng (1 frame - source, 2 frame - encode) 55 frame - 264 / 265 105 frame - 264 / 265 165 frame - 264 / 265 full size 55 frame - source / 264 / 265 105 frame - source / 264 / 265 165 frame - source / 264 / 265 Metric: SSIM(Y) (Luma) http://images2.imagebam.com/8b/bb/2b...1784719843.png SSIM(U+V)/2 (Chroma) http://images2.imagebam.com/28/5e/d6...3786605333.png MSU Blurring(Y) (Luma) http://images2.imagebam.com/90/36/df...b786522933.png MSU Blurring(U+V)/2 (Chroma) http://images2.imagebam.com/cf/dd/35...8786522943.png The difference between the AVG values of x265 and x264: ssim: Y~1%, UV~2% blur: Y~55%, UV~98% (!) I. e., the SSIM metric is easy to cheat by blur and for this, an additional blur test is needed. no-sao and psy the flags which made it possible to get rid of the blur. But when you use them, the probability of artifacts increases dramatically, even at such high bitrates ;( (105 frame - wood, 165 frame - sky) Last edited by zub35; 19th March 2018 at 19:33. |
20th March 2018, 02:50 | #3 | Link |
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Gser aq3 and deblock 0:0 because the resulting quantifier values for both IPB codecs are x265(x264) - I:19.96(22.20) P:23.72(27.03) B:28.25(29.90) Avg:27.18(29.19)
With such QP values, and sao disabled, visual quality is at the edge, not to be completely in the artifacts (although they and so there is) p.s. This is simple resize. If you use ResizeShader-SSIM, alas, or extremely strong artifacts, or sao-on=blur or 30+ Mbps (But at the same time, x264 can compress and at 20Mbps without blur) Last edited by zub35; 20th March 2018 at 03:22. |
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