I'm Interlacing Stupid

[Tolwyn]

Can someone explain what Interlacing is and De-interlacing?

Also... if I'm capturing Hi8 tape through a Canopus device, I can tell, I think that it's "Interlaced." Do I want it interlaced if I'm burning a DVD? Is it bottom or top field first (and what does THAT mean?). It's Type2 DV.

Even playing back on a DVD Player—some of the early stuff I've done—I can kinda tell that something doesn't "look" right.

Anyways... I think this is one of the last questions, now that I've figured out aspect ratios. Man, was that hard for my fat, tired brain to understand.

[Nelson37]

Yes, someone can. Dozens, if not hundreds, already have. Use the Search function, you will find MANY explanations, with screen shots, worded in many different ways, commented upon, and discussed.

These explanations will be more complete than any you are likely to get in the next 6 to 8 posts, if you don't understand the first one go on to the second one. You might also want to search for Luke's Video Homepage, many basic terms thoroughly explained.

[canadateck]

Glossary<<<<



Deinterlace
The process of creating a single frame from the 2 interlaced fields of a video frame. Deinterlacing is used to remove the interlacing artifacts if a still frame is required, or if the video is being used at a different rate than it was created.


Interlace
Each frame of a video picture is scanned twice. Firstly, all the odd lines are broadcast, then all the even lines are broadcast. Each set of odd/even lines is known as a field. Two fields therefore make up a frame. The point of doing this is to reduce flicker, and not increase bandwidth.

[Tolwyn]

I've tried search, and didn't find an answer to my question. The glossary reply is great!

But... I need to know if I need to Bottom/Top Interlace; and/or if all DVD content needs to be "interlaced."

That's where I'm confused.

[MOVIEGEEK]

www.100fps.com/

[Supremus]

Can someone explain what Interlacing is and De-interlacing?

Also... if I'm capturing Hi8 tape through a Canopus device, I can tell, I think that it's "Interlaced." Do I want it interlaced if I'm burning a DVD? Is it bottom or top field first (and what does THAT mean?). It's Type2 DV.


Even playing back on a DVD Player—some of the early stuff I've done—I can kinda tell that something doesn't "look" right.

Anyways... I think this is one of the last questions, now that I've figured out aspect ratios. Man, was that hard for my fat, tired brain to understand.

If your source is interlaced, encode it as interlaced. You should never, never, never, ever de-interlace something intended for MPEG2. Deinterlacing should only be used for 29.97 fps material intended for a progressive display or format, such as VCD, DIVX, Quicktime, etc.

If your source is DV, it's probably lower field first... but it might be top There are quite a few ways of determining field order, but the easiest way for you is probably to encode 5-10 second of a scene with lots of motion at lower field first, and if it flickers like crazy, use upper (top) first. If it' the wrong field order, it will look as if it's going one frame forward, one back, one forwad, one back, etc. You should definitely be able to spot it.

[Tolwyn]

Got it! Thanks.
And the reason search wasn't working?...

I was pasting the word "interlace" mis-spelled. Sigh.