[mythtv-users] XvMC, i915, latest intel drivers

[jb17bsome]

On Fri, 11 Apr 2008 17:55:38 -0400
"R. G. Newbury" <newbury at mandamus.org> wrote:

> jb17bsome wrote:
> > On Thu, 10 Apr 2008 13:44:32 -0700
> > "Billy Macdonald" <billymacdonald at gmail.com> wrote:
> > 
> >> Hello,
> >>
> >>     I decided to give the latest Intel RC drivers a shot as they
> >> are supposed to incorporate XvMC.  I have been able to get them
> >> installed and was able to play back some mpeg using xine and
> >> xvmc.  So I'm pretty sure that the XvMC is working, at least
> >> somewhat.
> >>
> >>     When I configured mythtv to try to use XvMC it crashes on SD
> >> MPEG from QAM, and it falls back to xv playback in HD.  Xv
> >> playback does work properly, but the machine doesn't have the guts
> >> to play 1080i with 1080p output, which is my goal with XvMC.
> >> Doing some debuging MythTV is determining the max XvMC as 720x576,
> >> but xvinfo report 1920x1088.  Not sure what that's about.  But
> >> until SD plays with XvMC no point in even trying HD :)
> >>
> >>     It looks to me like the myth code is deciding to use a textured
> >> surface and not the overlay surface.  Is this how it should work?
> >> Any ideas on where I should troubleshoot?  I spent last night
> >> trying to dig through the code to understand how it all works, but
> >> I really don't understand the XvMC stuff very well.
> >>
> >>     I've attached my mythfrontend log and xvinfo if anyone feels
> >> like looking.
> >>
> >> Thanks,
> >> Billy
> >>
> >> PS
> >> fedora 8 i386
> >> Xorg 1.3 (i think, that's what the rpm installed is
> >> xorg-x11-server-Xorg-1.3.0.0-44.fc8.i386, but the latest Xorg
> >> releases are in the 7's so that confuses me.)
> >> xf86-video-intel-2.2.99.902
> > 
> > The intel xvmc drivers only support up to 720x576 surfaces.  So,
> > they won't help for HD.  Sorry about that.  
> > Also, Xvinfo gives you information about Xv but not XvMC.     
> 
> Where did you get that piece of information about 720x576? I
> understood that the intel (with xvmc) driver could handle the full
> 2048x2048 xv image size...makes no sense otherwise...
> 
> Geoff
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I looked in the xf86-video-intel source.        
Yes, xv lets you have 2048x2048 images.  However, xvmc has different
limitations that are kept separate from xv.