Name That Video Artifact!

[hizzy7]

Hi Video Jedi!

I am playing around with a DVD and I'm trying to fix her up. During the credit sequence, there's a weird shimmering/flicker that happens around the letters. It's weird. Is it mouse teeth or is it an interlacing issue? Can you video kings recommend a script to fix this up? Here is a clip:

http://files.videohelp.com/u/183506/VTS_01_1.demuxed_3.m2v

Thank you for the help!!!

Best,

hizzy

[badyu17]

It's dot crawl artifact, it's more noticeable when you see flames from the torches and movement. Maybe try to reduce it with checkmate or some other dot crawl removal filter in avisynth.

[jagabo]

What you have is what's left of dot crawl artifacts after a 3d comb filter was used to remove them. Further 3d comb filtering is unlikely to remove any more.

[badyu17]

Hey Jagabo, that filter that was used previously sure did a bad job, whenever there is a lot of motion it looks bad, right? Is this a case of bad dvd mastering?

[jagabo]

There are no dot crawl filter that work well when there's lots of motion, especially after MPEG compression. This always happens when composite video is digitized. The more saturated the colors the worse the dot crawl is.

[hizzy7]

Hi Jagabo & all!

I tried that resizing trick to fix it, but it didn't work. Am I stuck with it looking like this?

Thanks!

[hizzy7]

Hi Guys!

Here is another one. Is this blended fields or bad pal/ntsc? Is this one hopeless? Thanks!

http://files.videohelp.com/u/183506/tange.demuxed.m2v

[jagabo]

That video has blended fields along with over compression, bad levels, etc.

The half width resizing trick should have helped with the red characters. It may not have removed the dots crawl completely but it should have been much reduced. If you had access to the video before MPEG encoding it would have worked better. It does leave the video noticeably blurrier tough.

[hizzy7]

Hi jagabo!

I will try the resize again. Maybe I missed something.

Blended fields is the kiss of death, if I am not mistaken. Is that right?

Thanks!

[jagabo]

Blended fields is the kiss of death, if I am not mistaken. Is that right?

No, SRestore() does a pretty good job at eliminating the usual field blending from PAL/NTSC film conversions. It gets hopeless when there is more than one generation of field blending, a blend deinterlaced was applied, when a strong temporal filter is used in addition to the field blending, or the original was true interlaced video. SRestore() works by preferentially removing blended frames. So there needs to be enough unblended frames left to restore the original film frame rate.

[themaster1]

to remove dot drawl on borders (ntsc video):
main=last
main
turnright()
checkmate
turnleft()
bicubicresize(480,320)
spline36resize(720,480)
lsfmod
filtered=last
main
mt_edge().mt_expand
mymask=last
mt_merge(main, filtered, mymask)

[hizzy7]

Hi Jagabo!

Do you have a recommended Srestore setting for my clip or is () okay?

Thanks!!!

[jagabo]

mt_edge().mt_expand

What you really want is to build a mask of high color saturation edges.

Overlay(UtoY().mt_edge(thY2=4), VtoY().mt_edge(thY2=4), mode="add").mt_expand().BilinearResize(width, height)

That will protect sharp edges in areas where there is low saturation. You can play around with the thY2 values to tune to your liking. The lower thY2 is set the more edges mt_edge() will find.

[hizzy7]

Would I use: Overlay(UtoY().mt_edge(thY2=4), VtoY().mt_edge(thY2=4), mode="add").mt_expand().BilinearResize(width, height)

To replace:mt_edge().mt_expand

Thanks!!!

[jagabo]

Would I use: Overlay(UtoY().mt_edge(thY2=4), VtoY().mt_edge(thY2=4), mode="add").mt_expand().BilinearResize(width, height)

To replace:mt_edge().mt_expand

Yes.

[hizzy7]

Should the outputted avi have weird white blocks popping up on the screen, surrounding the edges of words and people? :P

Thank you!

This is my script:

main=last
main
turnright()
checkmate
turnleft()
bicubicresize(480,320)
spline36resize(720,480)
lsfmod
filtered=last
main
Overlay(UtoY().mt_edge(thY2=4), VtoY().mt_edge(thY2=4), mode="add").mt_expand().BilinearResize(width, height)
mymask=last
mt_merge(main, filtered, mymask)

[jagabo]

This should make the script clearer:

src=Mpeg2Source("VTS_01_1.demuxed_3.d2v", CPU2="ooooxx", Info=3) 

filtered = src.turnright().checkmate().turnleft().bicubicresize(480,320).spline36resize(720,480).lsfmod()
#mymask = src.mt_edge().mt_expand
mymask = Overlay(src.UtoY().mt_edge(thY2=4), src.VtoY().mt_edge(thY2=4), mode="add").mt_expand().BilinearResize(src.width,src.height).GreyScale()
mt_merge(src, filtered, mymask)

[hizzy7]

Hi Jagabo & Video Kings!

I was wondering what you thought of this script:

Mpeg2Source("VTS_01_1.d2v")
AssumeTFF().QTGMC(Preset="placebo")
SRestore()
AssumeFPS(23.976)
Spline36ReSize(704,468)

For this clip:

http://files.videohelp.com/u/183506/tange.demuxed.m2v

Did I deal with the blended fields properly?

Thanks!!

[jagabo]

There's no great solution for that clip. Rather than resizing from 720 to 704 I'd crop 6 on the left, 10 on the right. I don't know where you're getting 468 for the height. A 4:3 square pixel ratio would be 704x528.

If you want to try something faster than QTGMC() for smart bobbing try

Interleave(TFM(field=1),TFM(field=0)).vInverse()

[LMotlow]

If you want to try something faster than QTGMC() for smart bobbing try

Interleave(TFM(field=1),TFM(field=0)).vInverse()

Great tip, jagabo. Thanks.