function refps()
{
 s=source.MSuper(pel=1,hpad=0,vpad=0)
 bv = MAnalyse(s, blksize=16, isb = true, chroma=false, searchparam=1)
 fv = MAnalyse(s,blksize=16, isb = false, chroma=false, searchparam=1)
 source.MFlowFps(s, bv, fv, num=50, den=1)
}
SetMemoryMax(512)
SetMTMode(5,0)
global source=ffdShow_source()
SetMTMode(2,0) 
source.FrameRate() < 31 && source.Height() < 601 ? refps() : source
SetMTMode(1) 
#distributor() 
GetMTMode(false) > 0 ? distributor() : last