Deinterlace of Post-Interlaced Video

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Hi

Perhaps you know this PAL-specific problem: A Progressive Film
(cinema) is maked Interlaced for TV by splitting the Progressive
Frames in interlaced ones:

Frame1 Frame2 -> Frames nterlaced
Progressive

A1 B1 A1 B1
A2 B2 B2 C2
A3 B2 A3 B3
A4 B4 B4 C4

Is there really no simple way to back-combine the Half-Frames to
progressive?
(Standalone-Program, Virtual-Dub-Filter)

....

Thanks for any advice!

Bruno Rotondi
Switzerland
(Email: use s.rotondi instead of brotondi)