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Mpeg2 Macroblocking
#1
I have a few recordings that break up into blocking in fast motion. Anyone have a good technique to fight this?
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#2
It depends how bad the problem is... in avisynth, the deblock filter helps, but not so much; adding to that a grain plate helps a lot IMHO!
Sadly my projects are lost due to an HDD crash... Sad
Fundamental Collection | Vimeo channel | My blog
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#3
Is the deblock filter basically a softening filter? Does the grain plate itself help or is that with the deblock filter?
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#4
Deblock is not a softening filter; it basically "round" evident square blocks; grain plate is just a capture of film grain, so it's the real deal, it's"organic", and better than a classic grain filter which is fake.

Right now I'm finishing to work to The Arrival, and I decided to use deblock then apply a grain plate; deblock alone doesn't help a lot, because there is almost no grain in the BD, so the grain plate is the real winner here...
Sadly my projects are lost due to an HDD crash... Sad
Fundamental Collection | Vimeo channel | My blog
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#5
I would guess also that deblock should be used lightly to avoid removing non-block film details as well? I've only used that filter in Handbrake which has a simple slider for tuning, not sure what "more" or "less" actually means in terms of the filter though.
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#6
Thanks guys. I was capturing some stuff from my DVR and since it is MPEG2 there is a lot of blocking. For example this is from the open matte True Lies:

[Image: vlcsnap_2015_02_04_23h01m39s162.png]

I'd like to preserve it but you can see the problem. Its baked into the HD master.

Andrea, what setting do you like to use for deblock?
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#7
Usually I use the default ones, as the "harder" work is made by the grain plate!


Sure this is a problematic image, but should be not so noticeable when in motion...
well, here you are two processed image

with only deblock:
[Image: test_deblock.png]
link to the image: http://s27.postimg.cc/lqbpamb77/test_deblock.png

with deblock and faint grain plate:
[Image: test_deblock_grainplate.png]
link to the image: http://s27.postimg.cc/gsy4pi983/test_deb...nplate.png

(strangely today screenshotcomparison has problems...)
Sadly my projects are lost due to an HDD crash... Sad
Fundamental Collection | Vimeo channel | My blog
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#8
Thanks for the example Andrea. I'm going to give that a try. Frankly, I'm not much of an AVIsynth guy but there are too many useful tools for me to ignore it. I need to start getting more comfortable with it.
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#9
At the beginning, I was very afraid to use avisynth... but, thanks to my old BASIC and HTML programming knowledge, it was not that hard, after a LONG period of trials and errors... what I love most is the fact you have a simple script that you could also comment - I reccomend to do it every time - and, for example, if you back to work on a project after several months (or years) you only have to take a brief look at it, eventually make a small change, and you have a sort of "video program" that do everything on its own... I love this software, even if it's really old, it continues to amaze me!
Sadly my projects are lost due to an HDD crash... Sad
Fundamental Collection | Vimeo channel | My blog
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#10
Has anyone tried 2D Cleaner or Smart Smoother for cleaning up mpeg blocking? I tried 2D Cleaner and it looked pretty good on bad blocking but I didn't know if it had errors I didn't know about.
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