AVIs have these wierd lines all over (what is causing them?)

[drewson99]

I have been dancing around this problem for over a year now, and I am screwed now if I can't figure it out.

these lines appear in my avi movies whenever there is motion.




this is video of a wall, as I pan from left to right. There are wood panels between the wallpapered sections.

can you see the hundreds of fine lines that appear on the leading and trailing edges of everything?

ZZ

[drewson99]

nobody has seen this?

[legionpc]

Those lines are caused by interlacing.

De-interlacing the file might work (though I'm not sure how to do this) or converting to S/VCD (or whatever) and viewing on a TV.

I downloaded an interlaced avi the other day, but interlacing only shows on the computer, when you view it on a TV you don't see it.

[drewson99]

my purpose is to convert to MPEG2 and burn a DVD, so that should be okay, but when I hit the preview button in Ulead moviefactory, it looks as though they are still there. I have avis that do not have this, how were they made.

more importantly, how can I import my DV from my camcorder, in avi format, WITHOUT this crap?

ZZ

[Vejita-sama]

Several points. First you need to do some searching on interlacing and progressive video. The short verison goes like this. When TV was invented the only way to get a high enough frame rate to make everything appear to run smoothly was to show each frame as two fields. Each field as half the lines of the frame. One has the odd lines and the other the evens.

So that's 2 fields per frame, and 30 frames/sec = 60 fields per sec.

Now film (and computers) use progressive source. Each frame is a complete picture.

Standard (4:3) TV's can ONLY show an interlaced sourced. That means if you take a progressive film, you have to 'interlace' it to show it on TV (all this is long verison short so don't attack me Of course if you show an interlaced source everything is fine too.

Anyway, MPEG2 supports interlaced source. So you can put an interlaced video on a SVCD/DVD and it'll look fine on TV. But always look bad on your computer.

So you can capture from an interlaced source, encode, burn to DVD and it should be fine when you play it on your standalone.

That's the really short verison.

[drewson99]

i was just so confused when the resultant mpeg2 file looked wavy/blurry. I thought of the possibility that it might just look that way on the computer when looking at the avi, but when I saw it looking bad in Ulead, i thought no way it would look okay.

BTW: I did tons of searching with keywords like avi, lines, blur avi, ghosting avi, etc etc, but without knowing that this was an issue pertaining to interlacing, I didn't naturally think to search along those lines.

ZZ

[legionpc]

An interlaced source will always have problems on a computer. Seeing the interlace lines un Ulead is normal. They won't be there when you burn the DVD and watch it on your TV though.

[donpedro]

I was just testing something and interlaced avi looked fine in Ulead VideoStudio6.

[drewson99]

its wierd, sometimes you cant see them. but they were right, it didn't show up in the DVD

[donpedro]

Very, very good link....

http://www.100fps.com/