Smooth Slowmotion with AviSynth and/or VirtualDub

[Raga]

I'm looking into producing a smooth slow motion effect with AviSynth and/or VirtualDub. Yes, I've read this. However, the output isn't smooth, the video jerks in a rather unpleasant way.

So, in short, do you know of a filter for AS or VD that would interpolate the frames in between the existing video data to make it smoother?

[ropdoh]

If you have interlaced footage, you can deinterlace to 2 seperate fields, resulting in 50 fps (PAL) or 60ish fps (NTSC), which you can obviously play back at 25/30fps and its very smooth, although you will have sacrificied some vertical resolution.

Here is the PAL Avisynth code:
DirectShowSource("input.avi")
SeparateFields()
LanczosResize(720,576)
AssumeFPS(25)

Or, have a look at Dynapel Motionperfect (www.dynapel.com)

[Raga]

Yes, I recall having read of the interlace method as well, thank you for reminding me and providing the script, too. However if I want to make something for example 5x slower, I don't think that will do the trick. There would have to be a filter to interpolate missing frames. I really wouldn't like to start routing my files through any more programs, so if anyone has any further tips on how to get this done with VD/AS, I would be very grateful.

[bunyip]

VirtualDub can produce an acceptable slow-motion.
Under Video -> Frame Rate set the 'Source rate adjustment' to say 10fps and set the Frame-rate conversion to the original rate (eg 29.97),

This seems to produce smoother motion than the AVISYNTH solution but there is still some jerkiness.

Also, I'm not sure if this is the right filter but have a look at this Avisynth filter, "DePan - tools for estimation and compensation of global motion (pan)"
http://bag.hotmail.ru/depan/depan.dhtml

[Raga]

It's still pretty jerky. I don't think it can get much better without interpolating frames. I wonder however if this, bundled with some other filter, could do the trick.