I thought grain was a defect and had to be eliminated
So it's ok for a footage to have grain?
On your first line, I would change cpu=6 to cpu=0. It's generally a bad idea to use it anyway since there are better filters for what it does, but I've also seen it cause problems with the deinterlacing/IVTC process.
In some parts of the video there's blocking. I think there's also mosquito noise but I'm not sure about that one.
Which filter would you recommend me?
In two of the white boxes, what you've highlighted are the edges of the characters' hair and I don't see any color bleeding in those areas. It could just be my 6-bit panel, but I don't see color bleeding in any of the white boxes. I do see what looks like red color bleeding in one of the green boxes (it's only in the original image), specifically the left one, but this may be due to the aforementioned blending, which should be taken care of before attempting to fix color bleeding.
Mmm... it's difficult to see what I wanted to make stand out... It may not be bleeding... What I wanted to point out is that the background is not completely black. There are some parts where black is dark-greenish. Also the red color in the original frame is like dusty and darkish. All in all, colors in this source are funky to me. I mean, seeing those colors makes me feel the footage is old and kinda damaged, which in fact is true. You can see what I mean in the original frame which has no boxes or postprocessing. I wondered if there's a filter which corrects colors in that way.
The second screenshot looks overfiltered, especially for an older source. If you're going to use the footage for an AMV, you may wish to remove some or maybe a lot of the grain, but it isn't a visual defect on its own.
So for older sources it's better to leave grain and filter just a little?
You are also oversharpening the footage in my opinion, but again you may wish to make it look sharp in order to work well with other footage. This is a judgement call, but on it's own I wouldn't sharpen it.
It's a video on it's own. I just thought to sharpen it because the silhoutte lines in the original frame looked faded to me due to the master being old. Do you think they look ok and that may be the original style in that anime?
Finally, the footage on its own doesn't call for AA, but perhaps if bobbing or certain other filters are required, an AA filter (like daa) may become necessary.
I did bob the video using yadif(mode=1, order=1).
Most times I need to postprocess the video and then zoom it at 200% to see if it has aliasing because just using AvsPmod seeing static frames I don't see it clearly. It's much clear if I see the movie in full screen mode. Which steps to test if you need using an AA?
Following your tips I have taken out these lines:
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cpu=6 --> i used it for the blocking
MCTemporalDenoise(settings="low") --> so that there's grain
LSFmod() --> so that it's not oversharpened
daa().daa().daa() --> not sure if I need it or not. i tested the video and thought it kind of sharpened the lines.
which has left my script in just the basics: bobber, deblender, crop & resize and wondering which filters, if any, can I use to clean a bit the image. Help meplease~ XD
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#restores blended frames
Crop(10, 2, -10, -2)