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Posted by P_J_B on June 22, 2008, 10:15 am
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Hi,
Thanks for your reply. However I don't think the problem is anything to do
with insufficient processing power, my system can play 1080p blu-rays at
24fps flawlessly with an average cpu usage of 20% (30% peak). It is only
displaying this intermittent judder on 50hz video - even on standard
definition.
I am using it with a Sony HD LCD TV at 50hz refresh rate - both 720p and
1080p resolutions via HDMI.
Any help to troubleshoot this would be much appreciated.
Kind regards,
Pete
"JW" wrote:
> The superior graphics available on Vista and the requirement that drivers
> can not put part of their code in the lower levels of the kernel mean that
> more graphics power is required for the same function on Vista then is
> required on XP.
> Also graphics power requirements are different if Aero is enabled then when
> it is not.
> Are you using a CRT or Digital technology display? What resolution are you
> using over what interface?
> > Hi,
> >
> > I am based in the UK and have exactly the same problem as the original
> > poster on SD TV (haven't tried HD yet). I'm running one of the latest
> > Geforce
> > 8200 chipsets with an AMD phenom, 2gb RAM, tried it with two different
> > tuner
> > cards (Hauppauge and Blackgold) and verified the TV signal is ok. I've
> > ruled
> > out all the other solutions discussed previously. 60hz video played back
> > at
> > 60hz refresh rate displays fine. However 50hz video played at 50hz refresh
> > rate gets this random stutter - can even completely disappear for a few
> > seconds before coming back. It is most obvious on news channels with
> > ticker
> > tape.
> >
> > I am trying to get this to work on a Vista machine (tried Home Premium and
> > Ultimate) but the weird thing is on a build of XP MCE 50hz video played
> > back
> > at 50hz refresh rate is perfectly smooth as it should be. This leads me to
> > believe its either a bug with Vista or with the Nvidia drivers but as of
> > yet
> > I'm not sure where I go to raise this issue and see if it can be fixed.
> >
> > It is quite frustrating as in the UK our TV & DVD is PAL 50hz standard so
> > all the media I want to watch suffers from this problem. I'm guessing
> > that,
> > because the problem doesn't occur with 60hz NTSC material, it has largely
> > been missed.
> >
> > Kind regards,
> >
> > Pete
> >
> > "John Lockwood" wrote:
> >
> >> On 30/5/08 10:38, in article lmiv34lvjiik58pl9her00cjb7um65099j@4ax.com,
> >>
> >> > On Thu, 29 May 2008 23:25:00 -0700, Luke Tractor
> >> >
> >> >> Stutter is definitely worse when panning and ticker tape...why does
> >> >> the
> >> >> ticker tape come good and then stutter again, where are the
> >> >> bottlenecks?
> >> >
> >> > This sounds a lot like watching a 50Hz PAL signal on a 60Hz monitor/TV.
> >> > --
> >> >
> >> > Cheers
> >> >
> >> > Nigel Barker
> >> > Live from the sunny Cote d'Azur
> >> > MCE MVP
> >>
> >> Could be right Nigel. I currently view Media Center on a computer LCD
> >> which
> >> only supports 60Hz and 75Hz. Obviously 60Hz (the default) would be
> >> perfect
> >> for NTSC but it was particularly bad for PAL, when I changed to 75Hz it
> >> was
> >> much better (being that 75Hz is a better multiple of 50) but still not
> >> perfect.
> >>
> >> I will eventually be moving it to a large TV which does 50Hz and expect
> >> it
> >> to be completely smooth.
> >>
> >> As a different possible answer to Luke, if his signal strength is
> >> borderline
> >> then he maybe experiencing occasional dropped frames in the poor signal.
> >> If
> >> his stuttering is regular it is as you suggest a Framerate issue, if it
> >> is
> >> random then it maybe down to a poor signal.
> >>
> >> A much less likely possibility would be using an older, slower computer
> >> which is struggling to deal with multiple tasks, again this would more
> >> likely produce a more random stuttering.
> >>
> >>
>
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