[mythtv-users] Full system/CPU upgrade and still no DVD

[John Harvey]

Some of the work will be reduced. The main difference is the data transfer
size. The YUV updates are ~1/3 of the data required to update a complete
RGBA frame and the 350 struggles to update the RGBA frame in a single frame
hence the claims from mplayer about systems being to slow since the graphics
card is not fast enough. 
Also many compressed streams have the data in a compressed YUV format so you
don't have to generate the complete RGBA data from the yuv data before
transferring it to the graphics card. However the 350's YUV format is
different from most others so there is still some work to do but it is more
of a re-ordering and will use less memory than producing a full RGBA frame
so will probably be cheaper and provide better cache hits etc. but until
it's all working it will be hard to tell. Also the Xv layer in X should be
more efficient than writing through X and copying the data a few times so
this should also provide a cpu saving. 
As to whether this is enough for a via C3 to run well I have no idea yet but
hopefully I can get something out in the next week or 2 to try.

John

> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org [mailto:mythtv-users-
> bounces at mythtv.org] On Behalf Of Gabe Rubin
> Sent: 02 May 2005 20:57
> To: Discussion about mythtv
> Subject: Re: [mythtv-users] Full system/CPU upgrade and still no DVD
> 
> On 5/2/05, John Harvey <john.p.harvey at btinternet.com> wrote:
> > We are getting closer with the Xv support for the 350 so we might be
> able to
> > get reasonable performance for these other playback cases.
> > Not sure how quickly but I'm working on it in my spare time and its
> getting
> > really close now.
> >
> > John
> 
> 
> Does Xv support then rely on the CPU to do the heavy lifting, or does
> the PVR have the ability to do it?  My VIA C3 is rated at 1.2 ghz but
> is really ~800 mhz.  Is Xv not an option for a that type of system?
> Excuse my ignorance on these issues.
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