LoadPlugin("C:\Programme\AviSynth 2.5\plugins\MPEG2Dec3.dll")
LoadPlugin("C:\Programme\AviSynth 2.5\plugins\fft3dfilter.dll")
MPEG2Source("rose.d2v")
crop(4,0,-4,0)

Trim(2100,2500)
FFT3DFilter(parameters)

Trim(2100,2500)
FFT3DFilter(other parameters)

Trim(2100,2500)
FFT3DFilter(other parameters)

ConvertToYV12()

#########

LoadPlugin("C:\Programme\AviSynth 2.5\plugins\MPEG2Dec3.dll")
LoadPlugin("C:\Programme\AviSynth 2.5\plugins\fft3dfilter.dll")
MPEG2Source("rose.d2v")
crop(4,0,-4,0)

full = last

a1 = full.trim().fft3dfilter()
a2 = full.trim().fft3dfilter()
a3 = full.trim().fft3dfilter()

a1 + a2 + a3