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

[鞠斌]

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
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