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PyRoMaNiA

03-08-2003 04:55 PM

Blockbuster Questions

I am trying to find the right settings using blockbuster to almost eliminate all the blocks in dark areas from a DivX avi, I'm using FaeryDust and Convolution3D to smooth out most of the existing blocks, but to stop TMPGEnc from putting them back in again, I'm using Blockbuster noise, but I can't find the right settings. :?

Blockbuster(method="noise", variance=1.0, seed=1)
seems to eliminate almost all blocks in dark areas, but leaves a bit too much noise left over, and I do notice some blocks still there in slightly less dark surfaces.

Any suggestions? What exactly does the "seed" value do? I looked at the blockbuster ReadMe but it didn't seem to mean much to me :oops:. What difference will seed="1" and seed="50" make?

Jellygoose

03-09-2003 08:40 AM

I really can't answer what settings you should use, but the seed value doesn't change anything. It just makes sure, that the noise added is the same amount in each frame, so that the filesize doesn't fluctuate.
have you tried this:

Blockbuster(method="noise", variance=.6, seed=1, method="dither")

give it a try and tell me if it helped :!:

PyRoMaNiA

03-09-2003 08:51 AM

Thanks for your reply, Jellygoose :)

I didn't need to try that as I managed to fix it myself with variance=.9 and reducing "MergeLuma" from 0.8 to 0.2. Is it just me or does a MergeLuma value that's too high increase the amount of blocks in dark areas?

J-Wo	03-24-2003 12:19 AM

Pyro, I'd love to know what the results of your tests showed. Did you find a combination of filters that did the best job at smoothing out the dark areas? If so what was it? How many different DivX files did you test it on? Thanks!

PyRoMaNiA

03-24-2003 01:48 PM

I didn't really find out anything new, as it really depends on the DivX file...I found that FaeryDust and Convolution3D do a pretty good job of getting rid of a kind of striped blockiness that seems to cover dark scenes in some DivX files. It might be just me but it seems to me that a mergeluma value too high increases blockiness in dark areas, so I wouldn't go any higher than .6.

I also found that the blockiness is worse in lower resolutions, so i would normally use no lower than 480x576/480. Finally, a
Blockbuster(method="noise", variance=.X, seed=1)
can normally clear up most of the leftover blocks in dark areas. Where X is anything from .4 to .9, depending on the DivX file.

As you can see I didn't really find out anything new, but this information has helped me with about 6 DivX files so far. So I hope it will be of some use to you and others. :)

Icarus3000

03-24-2003 07:16 PM

Pyro:

Can you post your entire .avs script?

Thanks!

PyRoMaNiA

03-26-2003 03:04 PM

Here it is :).

Code:

MergeChroma(blur(1.58))

MergeLuma(blur(0.05))

LegalClip()

GripCrop(480, 576)

GripSize()

Faerydust()

Convolution3D(preset="movieLQ")

Blockbuster(method="noise" variance=.6 seed=1)

GripBorders()

Letterbox(0,0,16,16)

LegalClip()

kwag	03-26-2003 03:36 PM

Hi PyRoMaNiA,

Try MergeLuma(blur(0.05)) :wink:

-kwag

PyRoMaNiA

03-26-2003 04:15 PM

Thanks kwag! Edited! :D

PyRoMaNiA

03-26-2003 04:18 PM

By the way, kwag, what's your opinion about mergeluma values too high increasing blocks in dark areas? Am I right or is it just me?

kwag	03-26-2003 04:29 PM

Quote:

Originally Posted by PyRoMaNiA

By the way, kwag, what's your opinion about mergeluma values too high increasing blocks in dark areas? Am I right or is it just me?

I've just compared sharpness, and above 1.0, the sharpness drops drastically. I haven't compared blocks :roll:

-kwag