[mythtv-users] Good old XvMC .. don't you love it

Damian damian at gingermagic.co.uk
Fri Sep 14 14:35:46 UTC 2007

Thomas Kessler wrote:
> On 9/14/07, *Damian* <damian at gingermagic.co.uk 
> <mailto:damian at gingermagic.co.uk>> wrote:
>     Hello all,
>     I had another try with XvMC last night and actually got a bit further
>     with it. I'm only wanting it for standard defination playback, but as my
>     system specs aren't great I'm hoping that it will help with occasional
>     jittery/stuttery playback I get (especially on BBC1).
>     I have three questions regarding XvMC:
>     1) What's the best way to tell if it's working or not?
>     I find the frontend log confusing.
>     Times when I've thought that it is working, the fronend it thowing out
>     all sorts of odd info.
>     Time when I've though it's not it's throwing out different info.
>     What should I be looking for?
>     2) Is it still the case that BOBx2 is the only deinterlacer that works
>     with XvMC or is that old information (it's in the Myth guide I was
>     looking at)
>     My previous de-interlacing preference was 'kernel'
>     3) The times when I've thought that I did have XvMC working, it's had
>     kind of flickery lines at the top and/or bottom of the screen and and
>     logos on screen look flickery. Is that normal?
>     Is XvMC a sacrifice in quality for the sake of speed?
>     I thougth it was just a speed increse.
>     It's frustrating that I spend most of my day at a Windows machine, which
>     is where my email is set up for this list. It makes it so much harder to
>     just send a few lines from the logs to enquire about.
>     Cheers
>     Damian
> You'll know XvMC is working when you have a  black and white OSD (on 
> screen display). In order to use Bob or One field deinterlace, XvMC must 
> be working. I would suggest compiling the Nvidia drivers from source, 
> this seemed to be the best route for me. My setup is around 4 months 
> old, but you may find my installation notes useful. Go here: 
> www.djk-rite.com <http://www.djk-rite.com> and search mythtv in the blog.
> TK
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 From Memory, from last night ..

If I turned on XvMC, it didn't work. Couldn't even get any picture for 
liveTV. If I turned on the OpenGL syncing thing on the same page, as 
well as XvMC, then it seemed to work, and I'd get the grey, flickery 
OSD. I was less than impressed with the image quality though. Especially 
at the top and bottom and around solid blocks of colour.

I'm pretty sure my Nvidia drivers are set up properly.


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