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I found this Avisynth script via google. It'll do exactly what you want, but I'm not sure it won't look a bit ugly (simply frame blending that way). You'd obviously need to change the first line according to your source video, but you could open the script with VirtualDub.
c1=selectevery(last, 2, 0)
c2=selectevery(last, 2, 1)
Overlay(c1, c2, mode="blend", opacity=0.5)
About the only filter I've used along those lines is QTGMC for Avisynth. It's a de-interlacer but it can be run in progressive mode and it has settings for motion blur. By default QTGMC would de-interlace 60i as 60p. To de-interlace to 30p it still de-interlaces the same way, but drops every second frame, and the motion blur settings can be used to compensate to keep things looking a bit smoother.
If simple frame blending doesn't look good, and you're familiar with Avisynth, QTGMC in progressive mode after dropping frames might produce a more natural looking effect.
Just another suggestion..... as I said, I don't convert between frame rates much.
QTGMC(InputType=1, ShutterBlur=1, ShutterAngleSrc=30, ShutterAngleOut=180)
Last edited by hello_hello; 1st Apr 2014 at 12:28.