[x265] Less FPS

[Alex Giladi]

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 <skgola1997 at gmail.com> 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 <
> 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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