Wrongfully deinterlaced video

[pub]

This video has probably been deinterlaced while it actually was progressive, causing aliasing.


I tried several filters (aaa, daa, maa, aamcsharpmod, eedi2, LSharpAAF), but the 'jaggies' are still there after encoding. Does anyone have a solution?

[jagabo]

Try something like:

ConvertToRGB()
PointResize(width,height/2)
ConvertToYV12()
nnedi3(dh=true)

[pub]

That looks about right, but when using it on another part of the video, the aliasing is still very noticable during movement.
See the new sample.mkv
I've also added a sample of a source that doesn't have the aliasing as comparisment (sample2.mkv)

[jagabo]

Set the nns argument in nnedi3 higher to get better results with shallower diagonals. You can get rid of the RGB conversion too:

SeparateFields()
SelectEven()
nnedi3(dh=true, nns=4)

If you start getting blurry lines try SelectOdd() instead of SelectEven() for those sections.

For Sample2 try:

AssumeTFF()
TFM(mode=1, field=0, pp=1)
TFM(mode=1, field=1, pp=1) # second TFM might not be necessary, check more video
TDecimate(cycle=6, cycleR=1)

The frame rate might need a close look.

[pub]

Oh, I just added the second sample as comparisment of what it should look like. It has some 25p to 29.97i conversion but also logos so I'd rather use the logo-free one.

SelectEven looks better, but again during movement it looks terrible, even with the nns at maximum value. I added my output clip.

[jagabo]

I get the same results as you. Following nnedi3 with one of the other antialias filters, like Santiag(), will help a little. Even calling it multiple times:

SelectEven()
nnedi3(dh=true, nns=4)
Santiag()
Santiag()
Santiag()

Watch out though -- you may end up screwing up other parts of the picture. I don't think you'll find anything that works much better at restoring the missing field.

[pub]

Using Santiag 5 times got rid of it during movement. But as you said, it screwed up other parts of the picture, like causing haloing and some sort of noise in the background (output3a.mkv).

Before (sample3.mkv):

After (output3a.mkv):


I tried a few different variations of this at a whopping 0.45fps, but it didn't fix it. It did bring the bitrate down about 2500kbps (CRF 16)

MosquitoNR(strength=23)
Dehalo_alpha()
LSFMod(defaults="slow", strength=160, edgemaskHQ=true, preblur="FFT3Dfilter(sigma=4,plane=0)")

Or should I use EdgeCleaner instead of LSF?

[jagabo]

Try something like:

MosquitoNR(strength=23)
SeparateFields()
SelectEven()
nnedi3(dh=true, nns=4)
Santiag()
Santiag()
Santiag()
Dehalo_alpha(rx=2, ry=3)
MergeChroma(aWarpSharp(depth=5), aWarpSharp(depth=10))
ChromaShift(c=2)

[pub]

Is there a way to reduce the darkening? It's most noticable in the eyes and around the mouth (it begins to look like a mustache)

Before (sample3.mkv):

After the last script:

After the last script with 2 extra Santiags to get rid of noise during movement:


I also found something else (sample3full.mkv). In the red area, there are a few lines of noise.


The same type of blocky noise is visible on the face a few seconds later. MosquitoNR didn't get rid of it. Would Cnr2 or a smoother get rid of it? Or do I need to lower my CRF (currently 16 with animation tune)

[jagabo]

The slight darkening in areas between two nearby horizontal black lines can be reduced by changing ry=3 to ry=2 in dehalo_alpha(). That should still give adequate halo removal around horizontal lines.

I haven't looked closely at the other video yet but I think you'll need a debanding filter like GradFun3(). CRF 16 might be high enough quality to keep it from coming back.

[pub]

That worked

I tried a few (flash3kyuu_deband, GradFun3) with different settings, but it won't go away. GradFun3(radius=16,smode=2) gives the best result but the flickering is still very noticable

[jagabo]

If it's flickering you need a temporal smoother before GradFun3().

[pub]

That got rid of it, thanks!

[jagabo]

Be careful with temporal smoothers. They will lead to obvious smearing in low contrast moving areas. You can reduce that using a motion compensated temporal smoother like MCTemporalDenoise().

[pub]

I'm using this script now:

ffVideoSource("sample.mkv")
MosquitoNR(strength=21)
SeparateFields()
SelectEven()
nnedi3(dh=true, nns=4)
Santiag()
Santiag()
Santiag()
Santiag()
Dehalo_alpha()
MergeChroma(aWarpSharp(depth=5), aWarpSharp(depth=10))
ChromaShift(c=2)
MCTemporalDenoise(settings="medium")
GradFun3(radius=16,smode=2)

But it just stays on this for 45 minutes and then it goes on at 0.03fps:

avs [info]: 1920x1080p 0:0 @ 25/1 fps (cfr)
x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
x264 [info]: profile High, level 4.0

Will using a x64 Avisynth and x264 version speed it up or not? I'm now using 32bit for both.

And will adding a sharpener/Toon make the image look more 'alive'/less dull? (sample25f.mkv)

Before

After

I found another problem in another file. The sample I added (sample.mkv) probably got conversed 25p->29.97i->29.97p. Is it possible to restore it to 25p? I couldn't quite figure out FDecimate.

[jagabo]

Slow processing doesn't surprise me with all those slow filters. Sometimes it help to run some of the filters in different scripts, saving to a lossless intermediate between scripts.

Sharpen if you want to. Watch out for over sharpening halos and buzzing edges.

You can use TDecimate() to return sample.mkv to ~23.976 fps. You won't be able to fix the moire artifacts on the purple stairs but QTGMC(InputType=1, Preset="medium", EZDenoise=2.0) helps a bit with some of the buzzing edges.

[pub]

Other than the slow speed, it looks perfect
http://screenshotcomparison.com/comparison/132412

When encoding in parts, I noticed the thing that's slowing everything down is MCTemporalDenoise. I tried Avisynth+ and multithreading (8 thread Intel i7). It actually starts encoding now, but it takes a long time. My script now without splitting:

SetFilterMTMode("DEFAULT_MT_MODE", 2)
SetFilterMTMode("FFVideoSource", 3)
ffVideoSource("sample.mkv")
MosquitoNR(strength=21)
SeparateFields()
SelectEven()
nnedi3(dh=true, nns=4)
Santiag()
Santiag()
Santiag()
Dehalo_alpha()
MergeChroma(aWarpSharp(depth=5), aWarpSharp(depth=10))
ChromaShift(c=2)
MCTemporalDenoise(settings="medium")
GradFun3(radius=16,smode=2)
LSFMod(defaults="slow")
Prefetch(6)

You can use TDecimate() to return sample.mkv to ~23.976 fps. You won't be able to fix the moire artifacts on the purple stairs but QTGMC(InputType=1, Preset="medium", EZDenoise=2.0) helps a bit with some of the buzzing edges.

It's produced in PAL-land, so I'm not sure if 24000/1001 is the right framerate

[jagabo]

You can use TDecimate() to return sample.mkv to ~23.976 fps. You won't be able to fix the moire artifacts on the purple stairs but QTGMC(InputType=1, Preset="medium", EZDenoise=2.0) helps a bit with some of the buzzing edges.

It's produced in PAL-land, so I'm not sure if 24000/1001 is the right framerate

It was probably 24. But it's hard to tell the difference between 23.976 and 24 with cartoons -- only one frame out of 1001.