[mythtv] Re : vid branch hardware Q

manu eallaud at yahoo.fr
Mon Jul 16 21:49:43 UTC 2007

On 07/16/2007 04:00:36 PM, Steven Adeff wrote:
> On 7/16/07, Mark Kendall <mark.kendall at gmail.com> wrote:
> > On 7/11/07, Steven Adeff <adeffs.mythtv at gmail.com> wrote:
> > > I'm building a mythtv setup for my parents new house remodel and
> part
> > > of that will be a "master" frontend for their home theater room.
> I'm
> > > trying to "future-proof" it as much as I can and seeing as how the
> vid
> > > branch seems to be progressing quite well I assume it will be
> merged
> > > soon and people will be using their GPU's to do decoding instead
> of
> > > the CPU. My question is about how this works exactly? ie, is it
> better
> > > to spend money on a fanless 8800GTS or a fast CPU?  Can the vid
> branch
> > > use both the CPU and GPU to decode, does it need to do this?
> >
> > Steve - the mythtv-vid branch has no new decoding functionality. The
> > only GPU assisted decoding is still XvMC. The opengl display method
> > only uses the GPU for colour space conversion, scaling and
> > deinterlacing.
> >
> > If I were looking for a new card, I'd certainly be looking at the
> 8xxx
> > series cards but whereas you could make a reasonable stab at overall
> > performance comparisons for the 5 to 7 series cards based on number
> of
> > pipes etc, I still don't have a feel what is necessary in the 'new
> > world' of streams. Fanless 8500/8600 cards are readily available at
> > 'reasonable' prices but I just don't know if they have the clout to
> > cope with 1080 at 60fps.
> >
> > > One thing I'd like to make sure is that it can play back
> > > HD-DVD/Blu-Ray/h264 content (legality of playing back
> HD-DVD/Blu-Ray
> > > via a deCSS type program aside). I know the coreAVC patch helps do
> > > this, but I assume its not going to be able to use the GPU via the
> > > -vid branch? Will the -vid branch need the coreAVC patch to play
> back
> > > h264 content or will the GPU be able to handle it on its own?
> >
> > No GPU help for h264 is likely in the foreseeable future. I
> understand
> > there is work in progress for multithreaded ffmped decoding, so this
> > will likely be the thing to focus on. Once multithread support is
> > available, any fairly recent multi-core cpu should do the trick.

Well just to add a note of hope here, I have asked about that on the  
xorg ML and some devs think about using GLSL on intel onboard graphics  
to offload quite a bit the CPU (one of the forementionned devs is Keith  
Packard, which makes it a serious claim). A word of caution, nothing is  
implemented yet and it is not perhaps on the devs TODO list, but I  
guess that with proper direction others could do the job...


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