Very difficult deflicker

[doctorkhv]

What kind of deflicker to fix such a video?
https://drive.google.com/file/d/1tqXALbGKHZSwkfKLPYC4s6r8jFf74GEi/view?usp=sharing

[Sharc]

In AviSynth you can try with
deflicker()
descratch()
spotless()

Don't overdo though in order not to destroy details and the vintage look

Left: original
Right: deflicked
https://www.mediafire.com/file/e0y1x2yivztc2h0/deflicked.mp4/file

[doctorkhv]

Not bad, but:

1. Changed color space.
probably https://forum.doom9.org/showthread.php?t=175401

2. The flickering of three large spots on the right has not been eliminated.

[poisondeathray]

1. Changed color space.
probably https://forum.doom9.org/showthread.php?t=175401



The actual "colorspace" does not change , it's probably your method of viewing

Your provided source file was untagged 4:2:0 , but at 1440x1080 - so many programs will assume 709 for the RGB display conversion because the height is >576

Sharc's was resized to 1440x540 ,but the encoding was also untagged . Many programs will use 601 instead of 709 for the display conversion, because the height is 540 (<576).

If you are encoding a file you can tag the proper colorimetry flags. Depending on your workflow and programs, there might be other considerations as well, you'd have to provide more info

[johnmeyer]

One seldom-discussed method to suppress flicker is to use DCT=1 in the MAnalyze line when using MDegrain to reduce noise. When used after Deflicker you often get extremely good results. I use this on film sources all the time. I've queued up this link to take you directly to a "before/after" which shows flicker reduction:

https://www.youtube.com/watch?v=tBAHzO7rJS0&t=115s

Here is the code I use (in addition to a Deflicker call):

prefiltered = RemoveGrain(stabcrop,2)
superfilt = MSuper(prefiltered, hpad=32, vpad=32,pel=2)
super= MSuper(stabcrop, hpad=32, vpad=32,pel=2)

halfblksize= (block_size>4) ? block_size/2 : 4
halfoverlap= (block_over>2) ? block_over/2 : 2

bvec1 = MAnalyse(superfilt, isb = true, delta = 1, blksize=block_size, overlap=block_over,dct=1)
bvec1 = MRecalculate(super, bvec1, blksize=halfblksize, overlap=halfoverlap,thSAD=100)

fvec1 = MAnalyse(superfilt, isb = false, delta = 1, blksize=block_size, overlap=block_over,dct=1)
fvec1 = MRecalculate(super, fvec1, blksize=halfblksize, overlap=halfoverlap,thSAD=100)

bvec2 = MAnalyse(superfilt, isb = true, delta = 2, blksize=block_size, overlap=block_over,dct=1)
bvec2 = MRecalculate(super, bvec2, blksize=halfblksize, overlap=halfoverlap,thSAD=100)

fvec2 = MAnalyse(superfilt, isb = false, delta = 2, blksize=block_size, overlap=block_over,dct=1)
fvec2 = MRecalculate(super, fvec2, blksize=halfblksize, overlap=halfoverlap,thSAD=100)

denoised=stabcrop.MDegrain2(super, bvec1,fvec1,bvec2,fvec2,thSAD=denoising_strength).levels(0,gamma,255,0,255).tweak(sat=saturation).unsharpmask(PRE_sharp_ness,PRE_radi_us,0)

[Emulgator]

Good work, John !

[StainlessS]

John,

super= MSuper(stabcrop, hpad=32, vpad=32,pel=2,Levels=1)

I think you can add the levels=1 thing above, maybe a bit faster.
(All levels only needed for MAnalyse() on Superfilt, there is no MAnalyse() on Super clip)

[lansing]

There is Neat Video
https://www.youtube.com/watch?v=r_F6D5lvB3I