[x265] Less FPS

[Sunil Kumar]

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 <kalyan at multicorewareinc.com>
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 <contact at ligh.de>
> 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
>> > x265-devel at videolan.org
>> > https://mailman.videolan.org/listinfo/x265-devel
>> >
>>
>>
>> --
>>
>> Fun and success!
>>
>> Mario *LigH* Rohkrämer
>> maito:contact at ligh.de
>> _______________________________________________
>> x265-devel mailing list
>> x265-devel at videolan.org
>> https://mailman.videolan.org/listinfo/x265-devel
>>
> _______________________________________________
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>
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