Sunil, all, >From our experiments a few months ago, gains from AVX-512 were noticeable (>5%) at veryslow preset and 4K resolution. Best, Alex.
On Thu, Feb 28, 2019, 06:06 Sunil Kumar <[email protected]> wrote: > Thanks Mario and Kalyan for reply, > I have checked with same command avx512 is giving more FPS compared to > avx2. I am not able to understand with increasing the number of cores the > FPS is reducing after certain point . > How can i decide how many cores are need to use for best performance? > > About preset i have used it but as I mentioned in mail it will reduced the > quality of video right? By default *preset* values is 5 (medium) same is > with *crf (using 52 is giving best fps at the cost of quality). * > > Any *system level tuning *that help in increasing the performance? > > Can you also please give any example commands in general. How can I use 2 > pass (doest it help in improving the performance) > Thanks, > > On Thu, Feb 28, 2019 at 3:33 PM Kalyan Goswami < > [email protected]> wrote: > >> Hi Sunil, >> >> From the very first glace of your command line, I think you have missed >> the --preset option. [https://x265.readthedocs.io/en/default/presets.html]. >> You can try the ultrafast or superfast preset for higher performance. >> Regarding the overview of different CLI options plz check the x265 >> documentation: https://x265.readthedocs.io/en/default/cli.html >> >> Thanks, >> Kalyan Goswami, PhD >> Video Architect @ MulticoreWare >> http: <http://www.multicorewareinc.com/>//www.multicorewareinc.com >> <http://www.multicorewareinc.com/> >> +91 9884989331 >> >> >> On Thu, Feb 28, 2019 at 3:01 PM Mario *LigH* Rohkrämer <[email protected]> >> wrote: >> >>> Hi Sunil. >>> >>> Just a general note: AVX512 is not certainly faster than AVX2 on every >>> CPU model. There have been a few tests e.g. in the doom9 video forum. So >>> don't expect miracles. >>> >>> Knowing your exact CPU model may help estimating if there can be a >>> speedup, or if it is a model which may e.g. throttle too much to avoid >>> overheating. >>> >>> But wait for more experienced replies than mine... >>> >>> >>> Sunil Kumar schrieb am 28.02.2019 um 09:17: >>> > Hi, >>> > I am new to media encoding, I have heard that x265 is a very efficient >>> > encoding tool on Intel's platform with avx512 enabled. But I am not >>> able >>> > to get good FPS with avx512 enable. Can you please help me improving >>> the >>> > performance? >>> > >>> > 1) I have tried with core pinning but it seems like using more cores >>> is >>> > not beneficial, even reducing the FPS, How can we decide the no. of >>> > cores for best FPS in multi socket system. >>> > >>> > 2) Can suggest the command for efficient performance like the best >>> > command line parameters or performance parameters (if we use preset >>> then >>> > it will compromise with the quality of video and same with CRF, help >>> in >>> > deciding best thing). >>> > >>> > 3) How can I run in parallel or in multi pass (2 pass) please give an >>> > command example. >>> > the command i was using is: >>> > >>> > ./x265 --input <video.yuv> --input-res 1920x1080 --fps 50 --output >>> > out.hevc --max-merge 3 --no-tskip --no-rect --frame-threads 16 >>> --pools >>> > "+,-" --bitrate 16000 --asm avx512 >>> > >>> > how can we decide the --fps for input video? max-merge, no-tskip, >>> > fram-threads etc. >>> > Please give command so that it will help me out. >>> > Thanks, >>> > Sunil >>> > >>> > >>> > _______________________________________________ >>> > x265-devel mailing list >>> > [email protected] >>> > https://mailman.videolan.org/listinfo/x265-devel >>> > >>> >>> >>> -- >>> >>> Fun and success! >>> >>> Mario *LigH* Rohkrämer >>> maito:[email protected] >>> _______________________________________________ >>> x265-devel mailing list >>> [email protected] >>> https://mailman.videolan.org/listinfo/x265-devel >>> >> _______________________________________________ >> x265-devel mailing list >> [email protected] >> https://mailman.videolan.org/listinfo/x265-devel >> > _______________________________________________ > x265-devel mailing list > [email protected] > https://mailman.videolan.org/listinfo/x265-devel >
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