[mythtv-users] Jerky picture esp on panning shots

[Gavin Haslett]

Interestingly, I was fiddling with this exact issue recently. I couldn't see
many other symptoms of problems other than a perceptible jerkiness to the
picture. This morning I started fiddling and downgraded my Nvidia drivers to
7174 (was running 8756). My CPU time halved and the problems vanished.

I've still got some tuning and fiddling to do... but it's a LOT better so far.

Doug Larrick (doug at ties.org) wrote:
>
> Greg Cope wrote:
> > Hi All,
> >
> > I get quite a jerky picture especially on panning shots.  Everything
> > is still watchable, but is just not quite right.  Along with a size
> > issue (My display is too small so I am missing 10 or so edge pixel)
> >
> > The Jerky picture is similar to the effect of panning shots on some
> > LCD's that can't quite seem to keep up with the picture changing.
>
> Make sure you're asking for and getting realtime priority.
>
> I forget if OpenChrome supports OpenGL or DRM vsync.  If not, make sure
> you're successfully using RTC vsync (not usleep, which takes more CPU).
>
> Make sure your modeline's refresh rate is the same as (or a multiple of)
> your video's framerate.
>
> A search through the docs or archives will show you how to do these
> things.  'mythfrontend --verbose playback' is a good place to start.
>
> -Doug
>
>