Strange Original DVD (some kind of blurring problem)

[gaganspidey]

Hello friends,
I am new here and want some help from you people. I have this DVD and while watching it I noticed that 1 of the episode was not as clear as the other ones although I checked that both the files have 25fps (weird, isn't it ?) Then I found that there was something wrong with the frames,i.e, whenever there is any kind of motion in the video, it becomes kind of blurry and it can be easily seen by pausing the scene. So, I have here 2 screenshots of the same scene from 2 different episodes. Please see it so you will get a clear idea of what I mean.

http://xs125.xs.to/xs125/08136/scooby_blur291.png.xs.jpg (http://xs.to/xs.php?h=xs125&d=08136&f=scooby_blur291.png)
http://xs125.xs.to/xs125/08136/scooby_normal330.png.xs.jpg (http://xs.to/xs.php?h=xs125&d=08136&f=scooby_normal330.png)
© Hanna-Barbera

This must be some kind of defect when the professionals were authoring the DVD but why do they do so.Therefore I would like to know if there's any way of dealing with this problem (for eg: like ripping it to avi. format while reducing the framerate and then converting it again to .vob)
I want to free up space on my hard disk, so please let me have your helpful suggestions...

[manono]

Hello and welcome to the forum,

The first pic looks like a bad conversion from an NTSC source to PAL. But without an unprocessed sample it's hard to know for sure. Pictures aren't good enough to learn what's going on.

[gaganspidey]

Ok, here are the samples (13 MB both) :-
The sample for the blurry VOB is as follows:
http://www.megaupload.com/?d=B42YRUC7

And the sample for the other one which is good is as follows:
http://www.megaupload.com/?d=VINFK0QW

I am awaiting your advice...

[manono]

Hi-

It's not a bad NTSC2PAL conversion at all. The bad one has the fields phase shifted. To explain; ordinarily the top and bottom fields of a progressive video go in the same frame, like so (where the capitalized letter is the top field and the small letter is the bottom field):

A B C D E
a b c d e

They will appear at playback as progressive, with no interlacing. However, when the fields are shifted they aren't lined up properly, the result is interlaced and may appear blurry, especially if played in a software player using a blend deinterlace. When just playing the DVD on an interlaced TV set, there's no problem as it only plays fields. Even on an HDTV, if you have a decent player it'll look OK, as a good DVD player can line the fields up properly. On the DVD they're like this:

A B C D E
b c d e f

If converting to progressive AVI, the answer or fix is to use a field matcher in your AviSynth script, such as TFM from TIVTC, or Telecide from Decomb.

[gaganspidey]

I am really grateful to you for taking time from your schedule & answering me but to be frank I am new to AviSynth. Could you please give me a tutorial link so that I can learn about it.

[manono]

How were you planning on doing the conversion to AVI if you know nothing about video encoding?

Anyway, read everything at the AviSynth site. Read the docs included with the DGMPGDec package, especially the QuickStart Guide:

http://avisynth.org/mediawiki/Main_Page
http://neuron2.net/dgmpgdec/dgmpgdec.html

[gaganspidey]

I meant that I didn't knew the basics about AviSynth but I have worked a lot on VirtualDub and also I thought that after getting the .avi file, it would be easy to convert to DVD again by using [spam]. Thanks, anyways.