Xvid Codec is Grainy.

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Postby Qyot27 » Fri Oct 13, 2006 1:24 pm

Beldyn wrote:
Qyot27 wrote:My guess would be that prior to the upgrade, maybe post-processing was enabled?


These arn't videos I encoded myself, they are all AMS's off the website. The pixilization is killing me. Lawl ^^

Ok...the term 'post-processing' can also refer to a specific filter (or filters) that's in DivX's, XviD's, and ffdshow's decoder, that smoothes over stuff like grain and macroblocking (or at least attempts to) on playback. If it's enabled, it 'reduces' the appearance of such things, but if it's not enabled, you see the video in all it's unfiltered glory.

Example:
Image

If the configuration screen for XviD's decoder on your system looks like that screenshot, then you're seeing the native imperfections in whatever video stream, if a decoder issue is the only thing at work here (if the Film Effect box is checked, you see it even more because it overlays a slight haze of static over the image to emulate watching film stock). The Deblocking and Deringing options you see under the Post-Processing section attempt to rectify certain problems, but IMO they aren't worth the amount of resources they take up, especially with how poorly they actually handle the job.
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Postby Beldyn » Fri Oct 13, 2006 2:42 pm

Qyot27 wrote:
Beldyn wrote:
Qyot27 wrote:My guess would be that prior to the upgrade, maybe post-processing was enabled?


These arn't videos I encoded myself, they are all AMS's off the website. The pixilization is killing me. Lawl ^^

Ok...the term 'post-processing' can also refer to a specific filter (or filters) that's in DivX's, XviD's, and ffdshow's decoder, that smoothes over stuff like grain and macroblocking (or at least attempts to) on playback. If it's enabled, it 'reduces' the appearance of such things, but if it's not enabled, you see the video in all it's unfiltered glory.

Example:
Image

If the configuration screen for XviD's decoder on your system looks like that screenshot, then you're seeing the native imperfections in whatever video stream, if a decoder issue is the only thing at work here (if the Film Effect box is checked, you see it even more because it overlays a slight haze of static over the image to emulate watching film stock). The Deblocking and Deringing options you see under the Post-Processing section attempt to rectify certain problems, but IMO they aren't worth the amount of resources they take up, especially with how poorly they actually handle the job.


Changing the post-processing options didn't do anything to help the pixilization or the mirrioring effect. I'm completely stumpted. I gotta get a program to take screen shots.
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Postby Willen » Sat Oct 14, 2006 7:06 am

Beldyn wrote:Changing the post-processing options didn't do anything to help the pixilization or the mirrioring effect. I'm completely stumpted. I gotta get a program to take screen shots.


The player software you are using doesn't have a screenshot feature? Or do those screenshots look OK and the problems are only visible during actual playback?

Capturing a screenshot in Windows Media Player
VLC Media Player and Media Player Classic both have a built-in screen capture feature that doesn't require the hoops you jump through to get screenshots from WMP.
Having trouble playing back videos? I recommend: Image
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Postby Beldyn » Sun Oct 15, 2006 1:48 am

Thanks for those tips Willian, I've never taken screenshots out of WMP so you can imiagne how baffled I was when fraps captured a black screen.

I've taken a few screen shots.

Image
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Postby Beldyn » Sun Oct 15, 2006 1:50 am

Drats! I can't seem to figure out how to edit old post and for some reasont he photobucket img isn't working.
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Postby bob64 » Sun Oct 15, 2006 11:19 pm

Image
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Postby bob64 » Sun Oct 15, 2006 11:21 pm

^the picture that he was trying to show

What version is your xvid codec? Make sure your using at least version 1.1.0
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Postby Kariudo » Mon Oct 16, 2006 12:17 am

It looks like normal compression artifacts to me
(most likely a direct result of the filesize. smaller size at constant resolution makes it look worse)
ImageImage
Image
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Postby Mithos-kun » Mon Oct 16, 2006 3:16 pm

Beldyn wrote:Does anyone know how to get Fraps or another program to take screen shots outside of a program? I'm still unable to resolve this matter and I would like to post a pic so everyone can see it. I'm just about ready to begin work on a new video idea but I can't watch any of the current videos on my HD without going crazy.

Thanks

You don't need Fraps. Go to the Control panel and double click on Display. Under the settings tab click on advanced then click on the troubleshoot tab and drag the slider for hardware exceleration all the way down then you shoudl be able to take a screenshot of a video by pressing print screen.
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Postby Zarxrax » Mon Oct 16, 2006 3:39 pm

Yep, that image looks like totally normal artifacts. Nothing to be concerned about. Turning on deblocking and deringing in the decoder can help it a little.
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Postby Beldyn » Tue Oct 17, 2006 10:53 am

I finally fixed it. I simply re-installed AMVApp with everything and uninstalled the more obtrusive programs such as FFshow. I'm not sure what it install this time that I deselected the first couples of times I installed it. The colors were much better and not as grainy after doing a full install.

Any ideas what it is that caused this to begin with? Which codec? I had the latest Xvid installed, it has to have been something else.
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