I didn't really find out anything new, as it really depends on the DivX file...I found that
FaeryDust and
Convolution3D do a pretty good job of getting rid of a kind of striped blockiness that seems to cover dark scenes in some DivX files. It might be just me but it seems to me that a
mergeluma value too high increases blockiness in dark areas, so I wouldn't go any higher than
.6.
I also found that the blockiness is worse in lower resolutions, so i would normally use no lower than 480x576/480. Finally, a
Blockbuster(method="noise", variance=.X, seed=1)
can normally clear up most of the leftover blocks in dark areas. Where
X is anything from
.4 to
.9, depending on the DivX file.
As you can see I didn't really find out anything new, but this information has helped me with about 6 DivX files so far. So I hope it will be of some use to you and others.