What does this need?

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What does this need?

Postby Milk Or Life! » Thu Jan 19, 2012 5:25 pm

So i have those steins;gate bds and was wondering if they need other cleaning than maybe debanding and maybe derainbow (saw it in one specific dark scene only)
It will be good to know since im turning it into lags so i can clean them btw.
Some screenies

Code: Select all
http://img12.imageshack.us/img12/2715/20000j.png
http://img831.imageshack.us/img831/2997/10000d.png
http://img267.imageshack.us/img267/181/30000f.png
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Re: What does this need?

Postby Zarxrax » Thu Jan 19, 2012 7:47 pm

Looks pretty good to me. The less filtering the better.
If you only saw rainbowing in one scene, then maybe consider just de-rainbowing that one scene. Or maybe you dont even need to use that scene, in which case you could skip it altogether.
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Re: What does this need?

Postby Milk Or Life! » Fri Jan 20, 2012 7:18 am

Okay, i will keep that in mind. I looked up in google what banding is and it seems to be it, not rainbowing D:. Thankies.
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Re: What does this need?

Postby Mister Hatt » Sat Jan 21, 2012 7:27 am

You are filtering a bluray that has no obvious aliasing or gradation problems. Doesn't need filtering unless you're a good enough encoder to not ask this.
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Re: What does this need?

Postby Milk Or Life! » Sat Jan 21, 2012 8:27 am

well, that means less work for me D:
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Re: What does this need?

Postby mirkosp » Sat Jan 21, 2012 9:19 am

Mister Hatt wrote:You are filtering a bluray that has no obvious aliasing or gradation problems. Doesn't need filtering unless you're a good enough encoder to not ask this.

Dude, have you not seen the Stein's Gate BDs? It's fucking banding PALACE. Like, rainbow banding. It wasn't just crunhylol's fault if their stream was awful.
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Re: What does this need?

Postby Milk Or Life! » Sat Jan 21, 2012 9:57 am

Soo should i use something more than simply gradfun2db ? i used value of 3 already , seems to have helped alot, but there is slightly noticeable banding in "small" areas (for example part of clothes)
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Re: What does this need?

Postby mirkosp » Sat Jan 21, 2012 10:39 am

Don't use gradfun2db. And not with that strong of a value. You're killing detail.
Get the dither package and use gradfun3. Follow the manual to learn how to tweak the parameters. Also, do use it only in the scenes that do need the debanding, with a filter like strange. Another thing you can do to help is adding static grain (not much, just a tidbit), which helps hiding part of the banding, makes the picture look more detailed (keyword being look: it's not more detailed, just feels so while watching) and helps out preserving gradients in the final encode stage with 8bit encoding.
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Re: What does this need?

Postby Milk Or Life! » Sat Jan 21, 2012 10:48 am

Mmkay, then i guess i will clean it when i get overall scratch of my prj to not waste time (since im not sure what i i will be using of what i i'm cutting via vdub lol,it would be simpler if premiere handled m2ts in avs form but it isn't too stable with that D:) , thanks for suggestion.
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Re: What does this need?

Postby Milk Or Life! » Wed Apr 11, 2012 7:03 am

So i finally got around to read gradfun documentation , but i'm not sure about what should be interested in
thr=strength
elast=blur(attenuation?) thr over image.Should i use this or no? Probably useful if it looks over-filtered?
mask=not needed?
thr_det=even more detail
smode=2, should i be interested in value 3 ? I wonder how it works.
wmin=1?
subspl=default
lsb=true?
lsb_in=true?
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Re: What does this need?

Postby mirkosp » Wed Apr 11, 2012 8:24 am

Both lsb and lsb_in should be false since you're dealing with 8bit footage that you need to give to your NLE.
Never really looked into wmin and subspl, but as far as the other parameters go, you should set mode to 8 or so. Smode=2 is good. Mask is a useful parameter to keep the edges sharper, but as long as you keep thr low it's going to be fine. Rather, take into consideration radius.
As far as steins gate goes, the banding is quite noticeable at times, and would require some intense deband which will harm detail, so you should do a scene-based deband (look into my stRange function; phan's range will also work, but will kill memory usage much more quickly) and possibly aid yourself with manual masks through mt_merge to keep detail safe and only hit on the banding (so you might want to just encode the clips of the scenes you're going to use to lossless to save on filtering time rather than doing this on whole episodes, since you can avoid that).
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Re: What does this need?

Postby Mister Hatt » Wed Apr 11, 2012 9:07 am

I almost always don't tweak it. If I need any serious grain or something, there are better tools, and adding too much dither makes it impossible to compress so you may as well just add grain then.
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Re: What does this need?

Postby mirkosp » Wed Apr 11, 2012 9:10 am

You really don't know much about debanding with gradfun3, Mister Hatt, do you? Trust me, adjusting gradfun3's parameters is useful, especially if you aren't going the 16bit route. Before adding grain, it's better to make the gradients smoother, and adjusting the parameters will change what is recognized as banding and how it will get fixed, and results can vary wildly. Grain is good and all, but it can't quite fix banding on its own, at most it hides it partially, and even then you'd have to overdo it to have it actually have an effect, so it really is no solution on its own.
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Re: What does this need?

Postby Milk Or Life! » Wed Apr 11, 2012 9:23 am

Yeah radius=16
As about mt_merge i looked around but i don't see anything that would help me understand how i can use it in certain situations. Or general usage for example with random mask? So i can get what values are doing or something.
But maybe it won't be that bad? I hope D:
I'm still nowhere near doing this (about 30 seconds of vid lol...) but i guess i can start to learn how to do this thing in acceptable form D:.
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Re: What does this need?

Postby mirkosp » Wed Apr 11, 2012 9:31 am

Basically you'd be doing this:
Code: Select all
avisource("c:\path\to\your\lossless.avi")
unfiltered = last
debanded = gradfun3(*parameters as needed here*)
strange(500,1000,mt_merge(unfiltered,debanded,imagesource("c:\path\to\mask.png").converttoyv12(),true,u=3,v=3))

This will work from frame 500 to 1000 (both inclusive) and it will only apply the debanding in the areas of the video which are white in the mask. The mask should be otherwise black, to not have any filtering applied, and shades of grey will have a mix of the unfiltered and debanded clips.
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