quick deinterlace question

[xrv1138]

if i use deinterlace on a pal dvd which has no interlacing,
will this make for a bad final product ?
asking because i seem to have a dvd which has an interlaced first vob then no interlacing on subsequent vobs.
i know i could do a test but would prefer to learn a bit more about interlacing here.

[The Incredible One]

Hello,

I don't know if there could be a different in quality. All I can say that you have to see it for yourself because everyone is looking at a different way. I take the option "no deinterlace" and have also PAL movies. And I find the movies of mine great.

So try it and see for yourself.

[xrv1138]

umm
that wasnt the question ;-)
want to know what the effect is using deinterlace on non-interlaced source...
guess ill just try it

[DobbyPower]

Depends on the way you de-interlace I suppose.

I always use vertical reduce by 2, so basically throw away one of the two fields. So I lose resolution as I end up resizing from a smaller source. Having said that, I don't notice it when I'm watching it.

As for whether you'd notice the difference between your 2 vobs, well I guess the answer is that you won't, as in each case your throwing a field away before resizing so essentially it doesn't matter whether it's interlaced or not.

[xrv1138]

thanx

[MoonWalker]

DONT trust what DVD2AVI says about interlacing.See with you own eyes.Propably the movie is just "flaged" interlaced where it is progressive(If it's PAL)...SO you don't need any de-interlacing filters.If you use one you will not have a difference except slower encoding speed...


MoonWalker

[xrv1138]

cheers
i am using bitrate viewer to check the interlacing
im not sure if it shows actual interlace/progressive or if it just shows the flag
i suspect u r right about it just being flagged
but good to know that if i use deinterlacing then i just lose speed even if the original is not interlaced.
havent started the encode yet as i am testing some of the new betas with simple-resizing
will get to it soon 8-)

[gerti67]

Hi there,

i always wanted to know this too and tried bitrate Viewer. But for my PAL DVDs it always showed "interlaced" as DVD2AVI did. So it was no help at all for me.

Now i just use no deinterlacing because i'm only using PAL DVDs and it is said that almost all are "progressive" (with only a few well known exceptions like "Independance Day"). So don't waste your time with this. To be sure if it works with "No deinterlacing" try only one chapter and burn it on a CD-RW for testing. Must take only 10 minutes i think when doing a small one.

HTH,
gerti67

[Kandor]

try and preview with dvd2avi and if you see any interlacing then try swap field order and if it doesnt help then use deinterlace.
because using deinterlace will blurr the picture, and specially on progressive source when there is no deinterlacing invaved you will get a movie that is blurrier than it should be.
btw if your doing svcds you never need to deinterlace if your watching the movie on a tv but its another story on monitors.

[xrv1138]

ok will do
and the interlacing only affecting monitors doesnt seem to apply to 2 dvds that i processed
the interlacing was evident on my tv as well
and disappeared once i encoded with deinterlacing.

[mordant]

I'm wondering if that has anything to do with the stand alone DVD player you use. I used to have a Samsung 711 (well, I still have it but it's behind a door now) when I first started making SVCDs and the interlacing black lines would show on my TV. I would use filters in TMPGEnc to get rid of them.

I purchased a pioneer 343 a little while back and have just tried making an SVCD without deinterlacing because I kept reading that it wouldn't show on the TV, and with the 343 it seems to be true. I could clearly see the lines in the mpeg on my computer monitor, but there were no lines on the TV display from the burned SVCD.

[xrv1138]

guess it could well be my player...

[MoonWalker]

because using deinterlace will blurr the picture, and specially on progressive source when there is no deinterlacing invaved you will get a movie that is blurrier than it should be.

Kandor I think that if you use smartdeinterlace function it doesn't do anything at non-interlaced pictures.It doesn't affect them cause it's uses a true deinterlace algorithm whereas vericalreduceby2 isn't


MoonWalker...

[xrv1138]

ok
so the methods do vary in degree of effect on non interlaced sources.
is the new Donald Grafts Telecide technique one that would be detrimental is used on a noninterlaced source ?