[mythtv] XvMC VLD extension

Michael Weber mtweber at gmail.com
Mon Sep 18 13:32:03 UTC 2006

I have seen this confusion on some mailing lists before.  The CN400
will decode MPEG at HD resolution, it's the TV encoder that will not
display HD resolutions.  As long as the output device is hooked up via
VGA, the SP13000 will decode HD content.  There is something wrong
with the software, not the hardware since I can successfully decode it
in xine on this machine.


On 9/18/06, Wander Winkelhorst <w.winkelhorst at gmail.com> wrote:
> On 9/17/06, Michael Weber <mtweber at gmail.com> wrote:
> > > I tried the mythtv-vid branch for Via SP13000 HDTV decoding and all I
> > > get is a blank screen with good audio when trying to play 1080i
> > > content.  When looking at the code, it doesn't seem like the VLD
> > > extensions are being used (XvMCPutSlice2).  XvMCPutSlice2 seems to
> > > boil down to a function pointer "draw_horiz_band" in a render
> > > structure, but this member never seems to get called.  Have the VLD
> > > extensions for the Via chipset been lost along the way?  (This
> > > function also never seems to get called in the trunk either).  Am I
> > > missing something or doesn't XvMCPutSlice2 need to be called for the
> > > VLD decoding?
> >
> > Nevermind -- I found it, it's called throughout the libavcodec
> > library.  Has anyone else experienced good sound with no video on the
> > mythtv-vid branch with a Via CN400?  Is there anything I can do to
> > help find this problem?
> >
> As far as I know, it's a hardware limitation.
> The CN400 chipset won't do decoding above the 1024x1024 resolution.
> I heard the new Intel core duo's are pretty fast..
> Regards,
> Wander.

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