LoadPlugin("path/to/ffms2.dll")

src1 = FFM("video1.mp4")
src2 = FFM("video2.mp4")

stackhorizontal(src1, src2)

function FFM(string s) {
X=s
ffindex(X)
A=ffaudiosource(X)
return audiodub(ffvideosource(X), A)
}