Deformed motion with TemporalDegrain() HQ>0

[fvisagie]

When I use TemporalDegrain() I sometimes get deformed motion. It almost looks like a 3D rotation effect - some foreground objects move faster than some background objects.

For example, using

a = last
a.TemporalDegrain()

on http://www.mediafire.com/file/0lym5r...ing_sample.wmv, there's deformed motion between frames 22 and 23. In other places too, but that's a good example.

Reducing degrain or SAD1/2 (by a lot) helps a little, but in either case denoising effectiveness is reduced obviously. The only thing that prevents almost all deformation is setting HQ=0, but that also reduces denoising.

Is TemporalDegrain() suitable for clips of widely varying sharpness like this one? If so, what are the recommended settings to use with HQ>0 but without deformation?

Is there another MC temporal denoiser that's more suited to this kind of footage perhaps?

Many thanks,
Francois