Deformation and colour fringing on high motion

[Morte66]

I've just bought an interlaced ballet DVD I'd like to clean up a bit to watch. Here's a clip (https://dl.dropboxusercontent.com/u/80519209/cut.zip).

I'm generally OK with deinterlacing, noise etc but there are some problems in the source with extreme motion. Things get deformed with ghosted/double images, and there are intermittent colour fringes. It's most obvious on the ballerina's hands/feet/elbows when she pirouettes.

I'm not sure whether this is down to video processing, or it's a fundametal artefact of mechanical shutters and motion that's too fast for them, or a bit of both. Anyhow, I wonder... ...is this a problem with a solution, or do I have to just live with it?

Any insight would be appreciated.

[Morte66]

After staring at this a bit more, I think I might have worked out what's gone on. I think there are two separate problems.

I'm pretty sure the deformation is a shutter effect, I've now found similar examples in other material. I'm not sure if anything can be done about this, but it's quite rare and unobtrusive at normal speed so I'm not too worried.

The colour fringing is a pain, it shows up as not-quite-subliminal-enough colour flashes on full speed playback. I think it's caused by frame rate conversion -- it's a BBC TV production which would mean 50fps, but a 60fps NTSC DVD. So there's been some sort of mocomped 50 to 60fps rate conversion which wasn't quite good enough, and left icky colour ghosting.

I wonder if one could do some sort of long timebase temporal denoising on chroma around moving edges to tackle the fringing. TBH that's beyond my Avisynth, I'm not sure where to start.

[scharfis_brain]

colour fringing appears because you cropped by a non-mod-4 pixelcount in the vertical direction.
remove the cropping and colour fringing will be gone.

[Morte66]

colour fringing appears because you cropped by a non-mod-4 pixelcount in the vertical direction.
remove the cropping and colour fringing will be gone.

Thanks scharfi.