Which filters to use to clean this dvd video?

[orion44]

I want to make a backup of my DVD with DivX 6.

Which avisynth filter do you recommend to clean this dvd video?

Here's a screenshot:

http://i53.tinypic.com/1690weh.png

(Is this noise in this video?)

[[P]ako]

You will get a lot more help if you post a video sample.

[orion44]

Here are the samples:

Sample 1 (https://rapidshare.com/files/755652165/Sample1.vob) (very noticeable in this scene)

Sample 2 (https://rapidshare.com/files/192567130/Sample2.vob) (medium)

Sample 3 (https://rapidshare.com/files/2269067883/Sample3.vob) (less noticeable in this scene)

I'd appreciate if you could tell me which filters are suited for cleaning this type of source, and which one would you recommend.

Untill now, I only used a few of the most basic avisynth filters.

[[P]ako]

Oh wow, sample 1 is just horrible. Sample 2 and 3 are acceptable, given that one is inside a cave and somewhat darker.

You should look into http://avisynth.org.ru/mvtools/mvtools.html but I think that trying to clean that source would destroy the picture.

[Didée]

MDegrain2/3 with blksize=16,overlap=8 for vectorsearch does a pretty fair job here.

I'm rather concerned that the posted screenshot does not-at-all reflect the video quality: it seems that the screenshot is using only 16bit colors?

If you have your desktop set to 16bit colors, then all those videos will look bad, no matter how much filters are used ...

Make sure that the desktop's color bitdepth is set to "32bit". With 16bit you're screwing yourself.

[orion44]

MDegrain2/3 with blksize=16,overlap=8 for vectorsearch does a pretty fair job here.

I'm rather concerned that the posted screenshot does not-at-all reflect the video quality: it seems that the screenshot is using only 16bit colors?

If you have your desktop set to 16bit colors, then all those videos will look bad, no matter how much filters are used ...

Make sure that the desktop's color bitdepth is set to "32bit". With 16bit you're screwing yourself.

Thank you. I will try it out.

My desktop color quality is set to 32 bit.

I took the screenshot with the Print Screen key in Daum's PotPlayer. The output was PNG with native resolution of my monitor (1920x1080).

When I uploaded the image to tynipic.com, the picture got resized to 1600x900. So maybe it's because of that.

[orion44]

Should I degrain before cropping and resizing or after it?

[[P]ako]

I normally crop and resize after deinterlacing and before applying other filters.

[Didée]

My desktop color quality is set to 32 bit.
It's okay. Turns out that FireFox didn't display the image correctly for me. Sorry for the buzz.

(Doesn't matter how 'gfx.color_managment.XXX' is set up - each possible settting will be wrong under some certain circumstances.)

[mathmax]

Strange that after removing the 3:2 pulldown, every 3 frames is lot more noisy... maybe you should process these frames differently?

[orion44]

Found the following discussion from this thread:

http://forum.doom9.org/showthread.php?t=155187

"mdegrain or mvdegrain shoud be used with the correct aspect ratio (aka par 1:1) and should be used as one of the
last filters (if after of resize) or used after an upsample of only one side to achieve the correct ar (if before of resize)."

"VOBs are anamorfic; MVtools work with PAR 1:1, therefore the same quantity of motion is otherwise valued,
depending on its direction; MVtools don't give precise results when used with anamorfic images."

Is this correct?

I should only apply MDegrain after cropping and resizing??

[Didée]

Is this correct?
Technically: yes. (Albeit arguable.)

Practically, it doesn't really matter. Dont worry.

[orion44]

Ok, thanks.