Pixelization (sp?) Problems

[jwu42]

Have been using GKnot for a few months with great luck encoding Sopranos Episodes. Tried my first movie today with crappy results.

Using 3.11 alpha and AC3 sound (GKnot .26 with full install) to do Vanilla Sky (Great Flick, btw).

After the 7+ hours to encode it I started watching and ran into what I call pixelization problems. Certain parts of the film are garbled and look like crap. There doesn't seem to be any consistent theme when this happens during the film. I am in the process of doing another 2nd pass and maybe that will help.

Any of you pro's know a cause for this pixelization? Any settings I should try and use/change.

TIA,

Jeff

[jwu42]

Well, an update...

The first encode was done with Soft Bicubic. I have tried neutral and also the "new" simple option. The neutral and simple are better and have only left 2-3 spots with heavy pixelization (artifacts). One scene seems impossible to encode and has been messed up every time.

Please folks, I need some help here :confused:

Could re-ripping the DVD help any?

I guess trying Sharp is my last option...:angry:

[jwu42]

Well, another update...

I ran it a 4th time, now with sharp and I tried anti-shit and it seems to have done the trick. I think it is the anti-shit that made the difference but can't be sure.

The one scene that caused problems in the 3 previous tires looks fine now. I will scan thru the rest of the movie this afternoon.

The only part that sucks is the additional time neeeded for Sharp resize and anti-shit 19.6 fps for first pass and then 14.6 fps for second pass on a 1.4 T-bird with a mild fsb OC (142).

I still welcome any thoughts on other ways to fix these problems. Cut out that one scene and splice it back in ?

TIA

[manono]

Hi jwu42-

I read the thread earlier, but didn't respond because I wasn't sure exactly what you were talking about.

But if the movie was done in DivX 3.11 (the problem doesn't occur in XviD or DivX 5.02), and if we're talking about the same thing, then it isn't pixelation. You're talking about ugly looking blocks in certain parts of the frames that might last until the next keyframe, right? Or it may be a nasty kind of smear over a part of the frame. So, yes, the problem is not with the Resizing method. You'll have to take the speed hit by doing the movie in Full Processing with anti-shit enabled. But it's still better than having the "shit" show up and ruin the movie. The guide suggests 16 as a reasonable setting, and you might set Min. Qual. to 1 as well.

Or you could switch codecs and get your speed back.

[jwu42]

Manono,

Thanks for the reply. Smears is a fair explanation, blocky distorted picture for 1-2 seconds especially if their is some action or something fast moving. Also, if the background and foreground colors are similar it struggles not to blur/distort them.

I have yet to fiddle with XviD and stick with the 3.11 since the release groups are still using it.

I should have grabbed a capture of what I was talking about to post and the explanation would have been clearer.

Thanks Again!

PS What guide shows 16 as the setting and "full processing mode" ? Are these settings in Nandub that I never see since I am running GKnot

[manono]

Hi-

Doom9's Nandub SBC guide recommends 16 for Anti-shit. But it also recommends 28-30 for Min Qual, which I wouldn't use as it may lead to oversized files. 1 will be fine.

Yes, you can't set Anti-Shit in GKnot. So, you'll have to take 5 minutes to learn how to set up the second pass yourself.:eek: And remember, the Anti-shit doesn't take effect unless you're in Full Processing. And you'll take a major speed hit in your encoding.

I have yet to fiddle with XviD and stick with the 3.11 since the release groups are still using it.

What the heck does that mean? Because they do it, that makes it right? Aren't you here to learn how to do it yourself and to make encodes as good or better than anything you've downloaded? Think for yourself, experiment, make mistakes, learn what looks best to you. It'll pay off in the end. Sorry-I'm off my soapbox now. Good Luck.

[jwu42]

Looking at the log, anti-shit was at 16 (I assume the GKnot default).

Fair point about using 3.11, but I generally find the quality good from most things I download. 95% of my collection isn't my rips so I am just getting started on doing my own. I think XviD looks like it is worth a try.

Thanks again for your help...