a=import("C:\encoding\pusher2\pusher2.avs").subtitle("Source", align=8)
b=ffvideosource("C:\encoding\pusher2\test-11kbps.mkv").subtitle("Encode, 11.0", align=8)
c=ffvideosource("C:\encoding\pusher2\test-ip-pb-13-12.mkv").subtitle("Encode, 8.8", align=8)
interleave(a,b,c)
ffinfo(colorspace=false,SAR=false,cfrtime=false,vfrtime=false,version=false,cropping=false,colorrange=false)

pusher2.avs:

ffvideosource("C:\encoding\pusher2\demux.mkv")
Spline36ResizeMod(1280, 720)
SelectRangeEvery(2500, 50, 10000)