Avisynth+

[edcrfv94]

Maybe auto one processes for each C/C++ filter(auto switch 32bit if 64bit not available) and auto adjustment prefetch and keep frames cache, can temporarily solve the multi-threaded problem until a new method appears.

colorbars(width = 1920, height = 1080, pixel_type = "yv12")

src = last
mcdn = src.kf_MCDegrainN(clip c, int "tr")

rfs(src, mcdn, mappings="[1000 2000] [3000 4000]") #Remap Frames

function kf_MCDegrainN(clip c, int "tr")
{	
	
	tr       = default(tr,          6)
	
	super  = MSuper(levels=0)

	multi_vec = MAnalyse(super, multi=true, delta=tr)
	
	c.MDeGrainN(super, multi_vec, tr)
	
	return last
}

colorbars(width = 1920, height = 1080, pixel_type = "yv12")

src = last

#1 processes prefetch 16 keep 14
#export last, src
#pass

mcdn = src.kf_MCDegrainN(clip c, int "tr")
	function kf_MCDegrainN(clip c, int "tr")
	{	
		
		tr       = default(tr,          6)
		
		super  = MSuper(levels=0)
		#2 processes prefetch 14 keep 12
		#export super
		#pass last, c

		multi_vec = MAnalyse(super, multi=true, delta=tr)
		#3 processes prefetch 12 keep 10
		#export multi_vec
		#pass last, c, super
		
		c.MDeGrainN(super, multi_vec, tr)
		#4 processes prefetch 10 keep 8
		#export last
		#pass
		
		return last
	}

rfs(src, mcdn, mappings="[1000 2000] [3000 4000]") #Remap Frames
#5 processes prefetch 8 keep 6
#export last

MP_Pipeline cann't pass audio, just for example.

MP_Pipeline("""
	
	SetMemoryMax(500)
	
	colorbars(width = 1920, height = 1080, pixel_type = "yv12")
	src = last
	
### export clip:src
### prefetch: 14,12
### ###

	SetMemoryMax(500)
	
	c = src
	super  = MSuper(levels=0)
	
### export clip:c, super
### pass clip:src
### prefetch: 12,10
### ###

	SetMemoryMax(500)
	
	multi_vec = MAnalyse(super, multi=true, delta=tr)
	
### export clip:multi_vec
### pass clip:src, c, super
### prefetch: 10,8
### ###
	
	SetMemoryMax(500)
	
	mcdn = c.MDeGrainN(super, multi_vec, tr)
	
### export clip:mcdn
### pass clip:src
### prefetch: 8,6
### ###
	
	SetMemoryMax(500)
	
	rfs(src, mcdn, mappings="[1000 2000] [3000 4000]") #Remap Frames
	
""")