jumping color dots

[ehickert]

I am using the latest versions of Gordian Knot 28.6.2
A strange thing has happened with the latest DVDs that I have ripped and converted to MPEG2 with CCE.

The encoded video has moving dark blue, dark red, and grey dots in the darker parts of the video. These seem to be random and sometimes appear in the lower right corner of the video too.

When I view the original ripped VOBs in PowerDVD or Windows Media Player, there are no moving dots. So I assumed the dots were created in the encoding process.

Could any of the programs in the Gordion Knot bundle be creating this randomlike dots? Has anyone else had this problem?

[manono]

Hi-

I'm not sure I understand. GKnot is for creating .avi's using VDubMod or NanDub to encode, not MPEG2's using CCE.

What did you use GKnot for, just creating the .avs? Maybe post it (without the lines beginning with "#"). But at the moment, I don't really see this as a GKnot problem. What happens when you open the .avs in NanDub? Do you still see those artifacts?

[jggimi]

I occasionally use Gknot to create AviSynth scripts to frameserve for VCD/SVCD encoding. There's even a setting on the "Save&Encode" window to use VCD or SVCD resolutions, rather than Gknot's bitrate/resolution calculator.

But Manono is right. Unless a filter in the script caused the problem, then no, it wasn't anything in Gknot. You didn't mention the release you're using, but recent versions have included AviSynth 2.5x to keep the video from DVD in YV12 colorspace, and have also included Undot() filtration.

Open the .avs script in any AVI player, or VdubMod, or Nandub. If you don't see the symptoms in the video, then Gknot isn't the source. If you do see the symtoms, then open the .d2v in DVD2AVI, and see if the symptom is in the source MPEG2 video stream.

[ehickert]

I reinstalled Gordian Knot 28.6.2 and CCE. I was then not able to reproduce the jumping color dots in Nandub, Virtual Dub, Media Player, etc.

The error must have been due to some faulty installation. My AVS file looked like this:

LoadPlugin("C:\PROGRA~1\GORDIA~1\mpeg2dec3.dll")
LoadPlugin("C:\PROGRA~1\GORDIA~1\undot.dll")
LoadPlugin("C:\PROGRA~1\GORDIA~1\decomb.dll")
mpeg2source("G:\Indiana01\New\M1.d2v")
Telecide(order=1,guide=1).Decimate()
Undot()
empty = BlankClip()
AudioDub(last,empty)

And then I encoded it in CCE 2.66. If I can reproduce the jumping dots, I will post a graphic of the dots.

Thank you

[piscator]

Perhaps, you used Quarter Pel in your previous encode? When used on a low bitrate, as I understood it, this can be an artefact somebody on the forum called 'moving pixel army' :p. Found it in thread (http://forum.doom9.org/showthread.php?s=&threadid=57219&highlight=quarter+pixel).

greetz,
Piscator