[x264-devel] x264-devel Digest, Vol 58, Issue 15

[鞠斌]

Hi everyone,
    Sorry for mistakenly forward this mail. I wanted to forward to mail to
my colleague. I am sorry for the trouble caused by my mail.

On Wed, Mar 21, 2012 at 9:27 AM, 鞠斌 <jubin1985 at gmail.com> wrote:

> 孙超，我觉得这封mail里面的信息对咱们有帮助，nvidia的cuda解码器能在tesla上跑吗？
>
>
> On Tue, Mar 20, 2012 at 7:27 PM, neve_capricorn at gmx.de <
> neve_capricorn at gmx.de> wrote:
>
>> Hi Edward,
>>
>> i red a lot that users want to boost encoding with the marketing hype
>> CUDA.
>>
>> I follow the cuda video development since 2 years, every XX month i found
>> new crap about speeding up h.264/x.264 with cuda. The most news i found is
>> marketing bla bla..The manufactors are writing 40x realtime encoding,
>> yeah..nice..but in what resolution, in what encoding h2.64 and bitrate, you
>> will never kind these detailed specification in their flyer :)
>>
>> I can say for sure that when you have the same settings in x264 and cuda
>> (elementary or nvidia own libs), cuda is not faster by the same quality
>> output.
>>
>> I never have seen an good solution about the major problem that came with
>> pararell motion detection.
>>
>> The second problem people often think is that for speedig up their video
>> process is the encoding part, but that is also not true.
>>
>> When your mpeg-2 source for example has an single-threaded decoder, you
>> got here then your bottle-neck.
>>
>> When you want to scale your content from 1980 to 640, then your scaler
>> must also be very fast.
>>
>> As you can see, your complete pipeline must have very optimize.
>>
>> What i do in our in-house encoding setup is:
>> Use Nvidia Internal public API for decoding h2.64 or mpeg2, then i use an
>> multi-threaded scaler from the libAV project, x264 for encoding. For ts
>> muxing i used an commercial library.
>>
>> Another problem i have with Nvidia is the coast of power. Dont get me
>> wrong, the nvidia are great gfx cards, but i pay about 300 euros every
>> month only for powering the cards 24/7 on.
>>
>> After 4 Month i had 2 issues with heating problems, cause the cards
>> produce a lot of heat when they run 80-90% of their core power.
>>
>> Right now i try to test some ARM developer boards for an cheap cluster
>> encoding with green-power technology.
>>
>> Let the community know when you have found some results about cuda.
>>
>> Gary
>>
>>
>>
>>
>> Message: 2 Date: Mon, 19 Mar 2012 10:37:16 -0700 From: Edward Richards <
>> edward at edwardandalison.com> To: "'Mailing list for x264 developers'" <
>> x264-devel at videolan.org> Subject: Re: [x264-devel] H264 and cuda
>> Message-ID: <096501cd05f6$ee230aa0$**ca691fe0$@EDWARDandALISON.com>
>> Content-Type: text/plain; charset="us-ascii" http://x264gpu.sourceforge.*
>> *net/ <http://x264gpu.sourceforge.net/>
>>
>>> Hi,
>>>>
>>> My current task is to find a solution to encode mp4 videos using the
>>> h264 algorithme using GPU thanks to Cuda (Nvidia), to decrease cpu load,
>>> in
>>> professional context. I'll work on it for few months so if any
>>> open-source
>>> solution already exists, I'll have to implement it.
>>> Do you know some open-source projects doing this? (i didn't find) If
>>> else is
>>> it possible to get some support to port your implementation on cuda (full
>>> documentation or whatever) Thanks for your help
>>>
>>>
>>>
>>>
>>>
>>> ------------------------------
>>>
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>>>
>>>
>>> End of x264-devel Digest, Vol 58, Issue 15
>>> ********************************************
>>>
>>
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>>
>
>
>
> --
>
> 祝好！
> Best Regards
>
> 鞠斌(Ju Bin)
> 中国科学院深圳先进技术研究院
> Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences）
>
> Tel:18603012471
> E-mail:jubin1985 at gmail.com
>
>
>


-- 

祝好！
Best Regards

鞠斌(Ju Bin)
中国科学院深圳先进技术研究院
Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences）

Tel:18603012471
E-mail:jubin1985 at gmail.com
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