I also thought a P4 3GHZ would be fast enough. There is some background info below but rather than XvMC, try running the Libmpeg2 decoder with no deinterlacing at a reduced resolution (see Appearance settings about running specific video at different resolutions or just reconfigure whole system for lower res). I found that with the exception of XvMC this was the best option for displaying HDTV on my 1080p display using a 3GHz frontend (with only a 64MB nVidia!). You might have to turn off XvMC in XvMCConfig to allow this to work. If that works you can try adding "one field" deinterlacing and see if you get stutter. Just try slowly turning everything up until you get problems and then back it off (tighten it until it strips and then back it off half a turn ;-) ) Good luck, Glen PS: Are you running MythTV 0.21? I was running a 2.67GHz Frontend that was working "just" fine under 0.20 with the exception of a minor stutter on some HD video. I upgraded both the CPU (to 3GHz) and MythTV to 0.21 and had no end of trouble getting reliable video. I ended up throwing in the towel and using the frontend hardware to construct a combined frontend/backend (later to become a backend only). This way I put the hardware in a more spacious case with a bigger power supply and a faster GPU (nVidia 6XXX 256MB). It now runs cooler and I can watch deinterlaced XmVC HDTV with no stutter and I can even display teletext subtitles that previously caused terrible stutter whenever turned on (having direct access to the HDDs probably doesn't hurt overall performance either). I am using a DVI->HDMI cable for the video and the grey OSD (with the exception of being grey) operates fine with only the (very) occasional stutter when displayed (usually at the start of playback or just after a commercial skip). I plan to construct a new frontend in the future (or buy a PS3) and retire this machine to backend duties only. > Mitch Gore wrote: > > > > > > Section "Extensions" > > > Option "Composite" "Enable" > > > EndSection > > > > But this is killing XvMC. Change it to "Composite" "0" > > > > -dsr- > > > > Changed it and it still does the same. I wish i could just disable > XvMC > but the computer REALLY studders. You would think 3.0Ghz would be fast > enough. > > Thanks, > Mitchell