Hmm I don't know a tool like this but I got a question.

What encoder do you want to use?
The mpeg1/2 encoders I know take complete frames in 25 fps and calculate 
the needed 50 fps fields out of them.

Just trace your animation with complete images and 25 fps the encoder 
does the rest.
(Rendering half-frames with 50 fps would take the same time. Hmm but 
when thinking about it would give the smoother animation...)

Maybe that helps

Sebastian H.

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