import vapoursynth as vs
core = vs.get_core()

src = core.ffms2.Source('D:\Compares\Behind.The.Mask.The.Rise.Of.Leslie.Vernon.2006\DEU\video.mkv\')
comp = core.std.Interleave([src, orig, mrg])
src = asf.FrameInfo(src, 'DEU')
comp.set_output()