Videoconvert needs to be optimized

[Tim Müller]

On Mon, 2014-05-19 at 16:19 +0000, Yaroslav Andrusyak wrote:

Hi,

it would be helpful to know what exactly you're actually
testing/comparing/benchmarking, as in: GStreamer version used, pipeline,
etc.

 Cheers
  -Tim

> 
> 2014-05-19 15:17 GMT+00:00 Mart Raudsepp <leio at gentoo.org>:
>         On P, 2014-05-18 at 18:46 -0400, Nicolas Dufresne wrote:
>         > Le dimanche 18 mai 2014 à 18:33 +0000, Yaroslav Andrusyak a
>         écrit :
>         > > Gstreamer is are great software, i use it for
>         srcreencastin with
>         > > hardware vaapi and omx h264 encoding.
>         > > But conversion  from ximagesrc (BGRx) --> vaapi\omx (NV12)
>         with
>         > > videoconvert (videoconvert_convert_matrix8)
>         > > uses too many CPU resources.
>         >
>         > The biggest gain would be to get an HW accelerated post
>         process method
>         > to do the work. Basically a way to replace videoconvert with
>         an
>         > accelerated version.
>         >
>         > Videoconvert already has a lot of optimization, we can't
>         trade
>         > correctness for speed, hence there will always be a certain
>         amount of
>         > work to do. Though you have an interesting typo, "many CPU",
>         an option
>         > could be to add some parallel processing to videoconvert so
>         the load
>         > could be spread across multiple cores. This will for sure
>         require a
>         > lot of work, but could enabled real time processing of
>         larger images
>         > in certain cases.
>         
>         
> I did some test gstreamer(omx\vaapi\x264enc  vs
> http://www.maartenbaert.be/simplescreenrecorder/)  
> simplescreenrecorder
> has  Convert_BGRA_YUV420_SSSE3 https://github.com/MaartenBaert/ssr/blob/master/src/AV/FastScaler_Convert_SSSE3.cpp and looks very good. 
> Gstreamer has hardware h264 encoders, but slow BGRx NV12 convert. 
> 
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-- 
Tim Müller, Centricular Ltd - http://www.centricular.com