Hi guys, thanks for the support,
I did some more tests (with the limited time I had today). First of all I reinstalled the DirectX (jun'2010) as MAG suggested and now 720p video playback with threads set to auto seems fine I have to do some more testing but it should be ok now (at least I hope so ).
The only thing that remains is the brief freeze at the beginning of the video when SVP tries to connect and detects 1:1. One question: if I create a profile ad hoc for this format and tell SVP not to intervene I get the osd message (and consequently the freeze) all the same, is it right? It should be awsome to be able to eliminate this freeze.
The dvd playback with lav video is still broken (it stutters horribly with SVP and threads set to auto) but with cyberlink decoder seems fine, even during chapters changes (I have some more tests to do though this night...)
For now thank you and keep up the good work
PS @Chainik, I have to run some tests on CPU usage, but I can tell for sure that while playing blu-rays with very demanding SVP settings (MadVR render) if I set threads to 8 my cpu is about 50%, but I get framedrops and OSD message low performance, if I set threads to auto, my cpu hovers to even 90% (semi-costant turboboost) but I do not have frame drops, even if the system is stressed