[mythtv-users] Re: Matrox G550 TV output

cythraul cythrault at gmail.com
Tue Oct 5 14:45:44 UTC 2004

Hi Shaun,

I'm sorry it took so long to reply. I've been busy at work.

Unfortunatly, I did not get around to test my 550 in my myth box.

Reading your reply, I was wondering what you meant by fast enought for
playback but not for livetv. What is the difference? I'm assuming your
capture card can't do hardware encoding so you rely on your CPU for
capture and this does not leave enought for the second head without

If so, I was wondering what kind of setup you had (cpu, memory
bandwidth, capture card) and what you observed on ressource
utilisation while using the second head during video playback.


On Sun, 19 Sep 2004 20:26:44 -0700, Shaun Jackman <sjackman at gmail.com> wrote:
> You're right that Xv doesn't work on the second head still. I'm hoping
> to find someone that knows Xv well to help me code up support. With my
> G550 I found even without Xv the second head is fast enough for
> 720x480 playback, but it is not fast enough for live TV unfortunately.
> My work is not a patch but an entirely seperate utility, so it's not
> much work to set up, if you want to try it out.
> Cheers,
> Shaun
> On Sun, 19 Sep 2004 22:55:51 -0400, cythraul <cythrault at gmail.com> wrote:
> > Hi,
> >
> > This is very interesting. Initialy, when I first tried to installed
> > myth (.13,) I bought a G550 before I read the forums on video card
> > recommendations. Now I'm running my setup with an MX440 but I find
> > that the tvout quality less then it could be.
> >
> > Meanwhile I've found some use for my G550, it'd be very nive to use it for Myth.
> >
> > Tho, from what I could read, it implied using the frame buffer and the
> > information I got at the time, is that the quality and CPU usage was
> > bad since it could not use XV.
> >
> > I'd love to this this new patch but I was wondering if these were
> > still an issue. Should I even attempt the venture since I'm already up
> > and running with a XV-enabled video card?
> >
> > Thanks,
> > cythraul

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