[x265] Less FPS

[Sunil Kumar]

Thanks Alex! Can you share your command that you are using?

On Thu, Feb 28, 2019 at 8:06 PM Alex Giladi <alex.giladi at gmail.com> wrote:

> 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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