[BUG] MvToolsFPSmod (AviSynth) - output plays too fast with wrong number of frames

[The_Tinkerer]

The problem seems like it could be with MvToolsFPSmod.avs...

If you half the frame rate and multiply by total number of frames, you get *around* the results I'm getting: 59.94 / 2 = 29.97, 193.585 * 29.97 = 5802. I'm getting 5890 frames.

function MvToolsFPSmod(clip C, int "NewNum", int "NewDen", string "Preset")
{
Preset = Default(Preset, "Film")
P_Film = 1 P_MusicVideoClip = 2
Pset = Preset == Preset == "Film" ? P_Film : Preset == "MusicVideoClip" ? P_MusicVideoClip : P_Film
thSCD2nom= (Pset==P_Film) ? 130 : (Pset==P_MusicVideoClip) ? 255 : 130
NewNum = Default(NewNum, 60)
NewDen = Default(NewDen, 1)

FramRat = Floor(Framerate( C ))
FramRatNew = Floor(NewNum / NewDen)
NewNumN = (FramRatNew / 2 == FramRat) ? FramRatNew : FramRat*5

superfilt = MSuper(C, hpad=8, vpad=8, pel=4, sharp=2, rfilter=4)
bak = MAnalyse(superfilt, isb=true, blksize=16, blksizev=16, badSAD=1000, badrange=-3, overlap=0, overlapv=0, search=4, searchparam=0, dct=5)
fwd = MAnalyse(superfilt, isb=false, blksize=16, blksizev=16, badSAD=1000, badrange=-3, overlap=0, overlapv=0, search=4, searchparam=0, dct=5)
Flow = MFlowFps(C, superfilt, bak, fwd, num=NewNum, den=NewDen, blend=False, ml=5800, mask=0, thSCD2=thSCD2nom)

H = (FramRatNew / 2 == FramRat) ? Flow : Flow.AssumeFPS(FramRatNew * 2 , 1)
B = (FramRatNew / 2 == FramRat) ? H : H.ChangeFPS(NewNum, NewDen)

return B
}

The "FramRatNew / 2" lines are halving the frame rate.

If I change the end of the third to last line to Flow.AssumeFPS(FramRatNew * 2 , 2), then I get an output of 11782 frames, which is a bit higher than the correct 11600. This would add over 3 seconds to the length and cause the audio to go out of synch.

Of course I have no idea what I'm doing or how to correct the script.. I'm just pointing out where the problem might be, i.e. tinkering.