Strange Fields

[babyray-uk]

Hi Guys

After using SeparateFields() on what I thought was straight forward PAL Interlaced material I ended up with some very strange fields. Field 2 + 3 seem to be "blended" together.

Field 1
http://img110.exs.cx/img110/5699/Snap8.jpg
Field 2
http://img125.exs.cx/img125/9866/Snap5.jpg
Field 3
http://img125.exs.cx/img125/7564/Snap11.jpg
Field 4
http://img125.exs.cx/img125/4273/Snap13.jpg

Is this the dreaded "Blended Fields" or am I doing somthing basic wrong?

Many thanks in advance

BabyRaY

[Mug Funky]

hmm. could you post your script?

it looks like yuy2 that's been converted from YV12 in a progressive way. this will be easily fixable, just post your script and i'll see if there's anything obvious, and if that doesn't help, maybe a small sample cut out of your source.

[edit]

i see what might be blending in the 4th pic posted, but the scenechange is a different problem.

[babyray-uk]

LoadPlugin("C:\Multimedia\GordianKnot\AviSynthPlugins\dgdecode.dll")

mpeg2source("C:\DVD Rips\Birtney Spears - My Perrogative\Lucky\Lucky.d2v", idct=0)

SeparateFields()

This is the script I used to generate the snapshots. (will resize/deinterlace once we have worked out what the problem is)

Is it just a colour space issue?

I have never seen this before from a DVD Rip.

BabyRaY

[Wilbert]

Like Mug says, post fields 5 and 6.

[babyray-uk]

Sorry, did not understand that is what was wanted....

Field 5
http://img92.exs.cx/img92/7650/Snap39.jpg

Field 6
http://img92.exs.cx/img92/6053/Snap40.jpg

Many Thanks

BabyRaY

[Mug Funky]

number 6 there looks like a fieldblend to me, but it's quite subtle, at least on that frame.

the bad scenechange has got me beat though. it's very possible your source was encoded as progressive in spite of it's obvious interlacing. maybe the git doing the encode thought NTSC FILM = progressive, even after PAL conversion?

i'm thinking that this is a field-blend conversion. reason: pretty much every video clip made is shot on film. the bigger the budget, the more likely it is to be shot on (really damn fine) film.

also, rather than mess up the music by speeding up to PAL, it's quicker and easier to just blend-convert the NTSC source.

the good news - the Restore24 script is made just for this type of stuff - you should be able to get a pretty nice looking backup from this in progressive frames. you don't want to use separatefields, though. smart-bob is better.

[Didée]

The bad news: This is indeed a norm conversion, NTSC -> PAL through fieldblending.

Fields 4 & 6 are obviously blended fields. Ans so is field 2, although it's a little strange that seemingly only the chroma is blended there.

The good news: It looks as if the source was originally 24fps FILM, not 30i video (else there should be more blends). With some effort, such jewels can be made progressive again (i.e. Restore24 or Unblend), but it's not really straightforward. If you need some workout, go for it. But if it's not *that* important (well, Britney Spears... ;) ), keep it like it is (blend-interlaced), and invest your time in something more feasable.


Edit: Hi, Mug Funky... I'm too slow for this world ;)

[babyray-uk]

OK wicked :) Will go and have do a look at Restore24

I take it the idea is to kind of do this...

Pal --> NTSC --> Film sort of thing...

I was only doing seperateFileds() to see if I could work out what was causing the problem (as the scene changes on my encode looked very strange) :)

Thanks for help (and super swift responces)

BabyRaY

[babyray-uk]

@ Didée

I was just having the "Should I keep this as interlaced" thought :)

Even through the conversion back to progressive sounds intresting to do...

I will have a play with it later on today.. and toy with the options..

Speak Soon

BabyRaY