Maybe you should consider using convolution3d filter (NOT general convolution). You can find it from doom9's forum (
http://forum.doom9.org/showthread.ph...&pagenumber=13 , the newes version of the filter is attached there). It's been some kind of secret for a while and I think that you should also know about it. I've been personally using it for tv-captures and the quality is outstanding! No noise, no visible blocks like when encoding to (x/k/s)vcd and it doesn't destroy all the details like some other filters.
