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14th January 2020, 18:36 | #7341 | Link |
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x265 v3.2+34-8e6db24c1517 (32 & 64-bit 8/10/12bit Multilib Windows Binaries) (GCC 9.2.0)
Code:
https://bitbucket.org/multicoreware/x265/commits/branch/default |
14th January 2020, 22:21 | #7342 | Link | |
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Except for lossless, where placebo has a pretty significant efficiency gain over even veryslow. |
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15th January 2020, 14:35 | #7344 | Link |
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I have 16 threads CPU. Is there a way to instruct x265 to use only 14?
Need the rest for other apps
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15th January 2020, 15:36 | #7345 | Link |
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I would just run x265.exe in IDLE priority. You may also use Process Explorer to change affinity to only 14 logical processors.
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Windows 7 Image Updater - SkyLake\KabyLake\CoffeLake\Ryzen Threadripper Last edited by Atak_Snajpera; 15th January 2020 at 15:38. |
15th January 2020, 18:03 | #7346 | Link | |
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15th January 2020, 23:55 | #7347 | Link | |
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https://x265.readthedocs.io/en/defau...l#thread-pools |
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16th January 2020, 07:15 | #7348 | Link | |
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multi-pass-opt-analysis / distortion causes a crash in this build. |
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16th January 2020, 11:21 | #7349 | Link | |
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Thanks alot! Sent from my iPhone using Tapatalk
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16th January 2020, 23:54 | #7350 | Link |
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Is there any way to fully utitlise x265 with single process (without distrubuted encoding) on Ryzen 9 3950X (16c/32t) without quality loss?
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AMD Ryzen 9 5950X, 32GB DDR4-3200 CL16, RTX 3060, 2TB NVMe PCIE4.0, NAS with 8x16TB HDD Last edited by jlpsvk; 17th January 2020 at 00:06. |
17th January 2020, 00:59 | #7351 | Link | |
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--preset slower --pmode --pme should saturate most systems. Although it's often faster to leave out --pmode and --pme if the cores/pixels ratio isn't that high. The goal is to maximize fps, not CPU load. PMode is typically a lot more useful than PME, which I've only seen to be helpful at SD resolutions and below. PMode and PME don't have any negative quality impact, and pmode can actually help a trifle, potentially. Doing 2160p on an 18/36 system encoding is ~30% faster without pmode than with it, even though CPU load is about 50% versus ~90%. |
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17th January 2020, 05:54 | #7352 | Link |
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--pmode can have a negative impact in CRF mode, so be warned. I just experienced that.. it produced a lower bitrate than without --pmode at the same settings at CRF 18, and I happened to check a scene with a heavily noisy picture. The dancing of the noise was much uglier than in a test encode without --pmode.
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17th January 2020, 12:21 | #7353 | Link |
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--ctu 32
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Windows 7 Image Updater - SkyLake\KabyLake\CoffeLake\Ryzen Threadripper |
17th January 2020, 19:48 | #7354 | Link |
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Right! There are other ways to increase parallelism, at the risk of some hits to compression efficiency. However, with a whole lot of cores, quality @ perf might have a different optimal configuration, like using more frame thread and a higher RD level. Other parameters in the same bucket:
-F >4 (this had quality hits in older versions; not sure of the impact in 3.x) --lookahead slices >8 (It seems like this shouldn't have a quality hit, but it is 1 in the slowest presets) Another thing that might help (haven't tested) without impacting quality is --selective-sao 2. SAO itself limits parallelism somewhat per https://x265.readthedocs.io/en/default/threading.html. So turning it off for B-frames could help. Although it's also possible that the latency hit is fixed whenever SAO is on at all, so --no-sao might help, although with efficiency hits, particularly at lower bitrates. Worth testing. |
17th January 2020, 19:49 | #7355 | Link | |
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17th January 2020, 20:51 | #7356 | Link | |
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17th January 2020, 21:07 | #7357 | Link | |||
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18th January 2020, 09:35 | #7359 | Link | |
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19th January 2020, 19:56 | #7360 | Link | |
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Code:
--preset slow --profile main10 --level-idc 5.1 --output-depth 10 --crf 16 --ctu 64 --aq-mode 4 --merange 57 --amp --no-rskip --qg-size 8 --vbv-bufsize 160000 --vbv-maxrate 160000 --bframes 8 --rc-lookahead 48 --gop-lookahead 30 --hdr10 --hdr10-opt --repeat-headers --no-info --no-deblock --no-sao --selective-sao 0 --allow-non-conformance --no-strong-intra-smoothing --high-tier --chromaloc 2 --fades --hme --hme-search umh,umh,star
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