Strange artifacts when deinterlacing old vhs video :(

[R3Z]

This one has me stumped, I have an old vhs video of a nirvana show thats the best quality available (thats sad in itself) and its been transfered to dvd.

Upon trying to clean it up and make some improvements i am stuck with some strange artifacts when using tdient, mvbob and securebob and mcbob.

Megui analyze tells me different things.For one of the vobs on the dvd it finds that the video is bff hybrid film/interlaced, for another vob it says its varying field order interlaced and different for another :(

I have manually ran the clip through dgindex and set it to honour pulldown flags.

I am confused as to what i should do, maybe the video is just such shit quality that the de-interlacers cant align the pixels or determine motion properly ? Not sure.

Could anyone have a look at my sample and give me a few tips ? I appreciate anyones time, i know you probably have better things to be doing :)

Heres the sample;

http://users.on.net/inet_s51/stuff/nirvana_test.mpg

Cheers :)

[davidhorman]

That sample is pure bff, but the odd fields (or the even ones, depending on how you look at it) are shifted by one line. This will correct it:

assumebff
separatefields

e=last.selecteven.converttorgb24
o=last.selectodd.converttorgb24

interleave(e,o.crop(0,1,720,239).addborders(0,0,0,1))
weave

And then try your bobber (if want a progressive output).

It's a bit clumsy with the converttorgbs but they're necessary to shift by only one line. There's probably a better way of doing this!

David

[R3Z]

That sample is pure bff, but the odd fields (or the even ones, depending on how you look at it) are shifted by one line. This will correct it:

assumebff
separatefields

e=last.selecteven.converttorgb24
o=last.selectodd.converttorgb24

interleave(e,o.crop(0,1,720,239).addborders(0,0,0,1))
weave

And then try your bobber (if want a progressive output).

It's a bit clumsy with the converttorgbs but they're necessary to shift by only one line. There's probably a better way of doing this!

David

Cheers for your help :)

Could i ask why the fields were shifted ? was it maybe to do with the guy who transfered it from vhs to dvd ?