Just like NTSC Video is true 29.97i, PAL has an equivalent. It consists of 50 unique fields interlaced together.

My current favorite conversion script for this type of content:

mpeg2source("PAL.d2v")
loadCPlugin("yadif.dll")

yadif(mode=1) # Smart bob mode doubles framerate (using interpolation and masking) (50fps)
Spline36Resize(720,480)

#extrapolate new frames (true in-between frames, NOT blended) (59.94fps)
super = MSuper(pel=2)
backward_vec = MAnalyse(super, isb = true)
forward_vec = MAnalyse(super, isb = false)
MFlowFps(super, backward_vec, forward_vec, num=60000, den=1001, ml=100)

#reinterlace (29.97fps)
AssumeTFF()
SeparateFields()
SelectEvery(4,0,3)
Weave()
converttoyuy2(interlaced=true)