VB_SVP
30 FPS videos of 24 FPS source material
How it was transcoded? Telecined 2:3 pulldown?
If yes then you need to get 24 fps by using IVTC algo.
all 30 FPS video I've tested, will not interpolate anything when it is set to "target frame rate: to screen refresh rate", instead it says 3o FPS * (1:1) = 30 FPS
It is strange. Can you show additional info just after playing video with setting "to screen refresh rate": SVP tray menu - Information - Additional information?
How do I get 30->60 frame interpolation?
I think you need more complicated chain:
30 -IVTC-> 24 -interpolation-> 60
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Sorry. You are change your question. What is wrong with framedoubling?