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HP N54L Microserver 2x2.2GHz AMD Turion, 2GB RAM ECC, Gigabyte GeForce 210, Technotrend TT-connect S2-4600 on USB2, Win 7/64 home premium installed from scratch.

TV (LG 60PK250 Plasma) attached via HDMI, using TV speakers for testing so using HDMI for audio. Audio set to HDMI/Direct sound. (Tried WASAPI as well, tried analog, all the same, disabled all fancy decoders)
No extra syncing options like change display refresh, adapt audio or so.

xbmc: plenty framedrops. unwatchable, 1-3 notable drops per second I guess. Funny: 1080p mkv from disk is all fine.
I noticed the CPU load to be spiking towards 80%, sometimes a bit more when TV is on, so I suspect WMCserver burning a lot of CPU handing xbmc the DVB stream (that 4600 has BDA drivers).
I never used DVB backends on Windows before so I configured WMCserver at best guess. Might not have done too well.

Pointers appreciated.

What version of xbmc are you running? Are these European broadcasts?

German channels on Astra 19.2E, xbmc 12.3

There is a problem with ffmpeg and h264 and wtv and some European broadcasts. It was fixed in Gotham. Try a Gotham nightly and see if the problem goes away.

oh, good. I'll try that.

Awesome, works! THANKS!

Glad that the Gotham fix is working, just as a side note I have found that DirectSound causes me major video stuttering issues on cdertain content (not LiveTV admittedly, this is more downloaded/ripped movies), so I always have to use WASAPI

WASAPI no good?

No, WASAPI is good... infact it's the only configuration that works for me without causing video stutter on high bitrate files. I believe it is newer than directsound and allows for applications to either share the digital output device or take exclusive control of it etc.

Sorry if I confused the matter, I was simply picking up on the fact you said you are using DirectSound, and chiming in with my experience that using WASAPI is best. I have also helped others on this forum who had stutter problems, by telling htem to change their audio from DirectSound to WASAPI

I can confirm that as well. DirectSound was a bloody nightmare for me.