Re: [gentoo-user] PCI video cards, hardware accel, upported by open-source drivers?

[Volker Armin Hemmann <volkerarmin@googlemail.com>]

Am Sonntag, 15. April 2012, 16:44:43 schrieb Florian Philipp:
> Am 15.04.2012 16:22, schrieb Michael Mol:
> > On Sun, Apr 15, 2012 at 10:09 AM, Florian Philipp <lists@binarywings.net> 
wrote:
> >> Am 15.04.2012 15:18, schrieb Walter Dnes:
> >>> On Wed, Apr 11, 2012 at 06:30:02PM +0200, Volker Armin Hemmann wrote
> >>> 
> >>>> Am Mittwoch, 11. April 2012, 02:11:35 schrieb Walter Dnes:
> >>>>>   If it's PCIe, so be it.  Actually, a post that prevents me wasting
> >>>>> 
> >>>>> money is helpful <G>.  Would PCIe be significantly better on the same
> >>>>> CPU+GPU, or is it hype?
> >>>> 
> >>>> a lot, lot lot lot better. No hype.
> >>>> 
> >>>   I've done some looking, and I'm back with more questions.  I've also
> >>> 
> >>> read the Nouveau-versus-NVIDIA thread.  Questions...
> >>> 
> >>> 1) Will PCIe 2.0 cards work in a PCIe 1.0 slot?  I'm not expecting 2.0
> >>> performance, I just want full backwards compatability.  PCIe 1.0 cards
> >>> seem to be rare, and have to be ordered online, while I can pick up a
> >>> 2.0 card locally at a store.
> >> 
> >> PCIe-2.0 is fully downward compatible to 1.1 and 1.0.
> >> 
> >>> 2) My main "torture test" will be HD fullscreen video.  Will there be
> >>> major improvement in that?  That's 2D.  Forget 3D.
> >> 
> >> 2D video is still rendered using OpenGL if your video player supports it.
> > 
> > I'm not aware of any video decoders using CUDA, OpenCL, or pixel
> > shaders for video decoding; AFAIK, unless you're using VDPAU you're
> > still using the CPU to render the video to a frame buffer. The most a
> > video player is going to use OpenGL for is stretching that frame
> > buffer to fit a window or screen, and possibly as a compositor to
> > place overlays like subtitles or playback control elements..
> 
> Agreed. Decoding is still usually done in software but offloading
> scaling and YUV to RGB conversion helps none the less. Mplayer, for
> example, allows a lot of customization depending on the amount of
> texture units. With high resolution displays and slow CPUs, this can
> have surprisingly large effects.
> 

and with vlc you can use vaapi which can make use of the video decoding engine 
of the graphic chip.

If the movie is using the right codec, of course.
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