Is there a bug in DGDecode postprocessing?

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Is there a bug in DGDecode postprocessing?

Postby Jnzk » Wed Jul 28, 2004 3:54 pm

I'm using AviSynth 2.55 from March and the latest version of Donald Graft's decoding package. The AVS file is as follows:

Code: Select all
MPEG2Source("c:\flcl_disc1\flcl_disc1.d2v",ipp=true,cpu=4)

Telecide(order=1,guide=1)
Decimate(cycle=5,mode=2,quality=3)

UnDot()

Crop(4,0,-4,-0)
LanczosResize(640,480)

ConvertToRGB32()
AssumeFPS(24)


This seems to produce strange very small stain-like blocks all over the video. They are visible for only 1-3 frames and jump from one place to another. Look closely at Haruko's hair to the right of her eye:

Image

The clips I took the screenshot from were saved uncompressed, so this can't be a codec problem.

I tried changing ipp to pp, but that only made the blocks appear at a different time. Then I removed postprocessing from the MPEG2Source line altogether, and voila, the annoying artifacts were gone!

Is this a known bug or something?
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Postby AbsoluteDestiny » Wed Jul 28, 2004 5:09 pm

If it's a bug then it's a bug that's probably been there forever. Donald hasnt touched the post processing code since doing his versions of dvd2avi.
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Postby Jnzk » Thu Jul 29, 2004 2:47 am

Janzki wrote:I tried changing ipp to pp

I meant ipp=true to ipp=false, of course. :roll:

I remade the .d2v with an earlier version of DVD2AVI and mpeg2dec3dg.dll, but the blocks remained. It's strange, I don't remember having this issue before. It's probably something on my system, but I can't figure out what. :|
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Postby Tab. » Thu Jul 29, 2004 2:51 am

It's probably marcfdcan'tprogramtosavehislife, that's what it probably is.
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Postby Jnzk » Sun Aug 01, 2004 10:21 am

I tried different versions of DVD2AVI and Avisynth. Uninstalled Divx and Xvid. The blocks remain. This has put my AMV making on hold. :(
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Postby Corran » Sun Aug 01, 2004 11:31 am

It happens to me too. This is why I don't use the cpu parameter in MepgSource anymore.
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Postby Jnzk » Sun Aug 01, 2004 12:28 pm

So I'm not alone after all. Can you recommend some filters/settings that would have the same effect as cpu=4 in mpeg2source?
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Postby Corran » Sun Aug 01, 2004 12:41 pm

Well... I just experiment until I find something that works the best for my source. I tend to use some of the stuff that AD mentions in the Beta guide with differences depending on my source's quality.

http://www.animemusicvideos.org/guides/ ... tqual.html


Some of the filters I tend to use regularly are:


Fluxsmooth
ssxsharpen
and Convolution3d or Deen depending on the amount of detail in the source
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Postby Jnzk » Sat Jan 15, 2005 10:34 am

Update: Donald Graft says he's fixed the bug. I haven't had time to test the new version yet.

Doom9 thread 1
Doom9 thread 2
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Postby AbsoluteDestiny » Sat Jan 15, 2005 10:48 am

Correct, postprocessing has also been changed so that you dont have to specify interlaced encoding and it will just base it on frame type.

I'm not going to update the avmapp quite yet, however, until the last of the bugs has been ironed out. I'll update the guides too (I've been waiting for these updates for months - finally people can use interlaced footage with reliable upsampling :P)
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