100% interlaced material, what to do..

[midiguy]

I have a problem here. we did a school project with a Hitachi DVD camera (makes MPEG2 video files). I transfered the footage to my computer and made the VOB files. now, here is my problem:
it appears that practically every single frame is interlaced. it is 100% interlaced material. that means I cannot IVTC it. now here is the real problem:
it is ok if it is interlaced, we are not watching it on the computer anyways, it is being shown on a regular NTSC television set. the problem is that we are editing the footage in premiere 6.5, using transitions and transparencies and other video effects. if we are changing around what the frames look like and they are all interlaced like that, is there something that could really mess up? like if we are doing a cross fade transition on two seperate clips from our footage, it is combining interlaced footage and messing around with the video stream, will that cause some sort of bad effect when watching it on a regular television set? thanks! I hope this makes sense!

BTW: we are probably going to burn the final result on a DVD-R, or put it on an SVHS tape. and also, should I deinterlace? if so, what type of deinterlace?

[Guest]

Most of your post is incoherent. Are you suggesting that Premiere is incapable of properly handling interlaced source?!?!?!

As long as you are going to display the result on an interlaced display and your format supports interlacing, then do not apply deinterlacing.

[midiguy]

Originally posted by neuron2
Most of your post is incoherent. Are you suggesting that Premiere is incapable of properly handling interlaced source?!?!?!

sorry about that, I was high when I wrote that. I am not suggesting that premiere can't handle interlaced content. what I am saying is that I am not doing striaght cut editing. I will be applying video effects and transitions to much of the material. I am just wondering if there are any negative effects to interlaced content when they are messed with like that.

similarly, for example:

resizing an interlaced source (720 x 480, 4:3 aspect) to 512 x 384 without performnig IVTC or deinterlacing is VERY BAD as we all know. I am just wondering if I am kind of doing something similar by using transitions and transparencies, nad other video effects, to 100% interlaced material.

sorry about me not being clear earlier.. and thanks for your help!

wait a sec, is that you donald? THE donald graft? :D :sly:

[mpucoder]

Of course camera output is interlaced, and IVTC is not applicable (that applies only to film). As for transitions using interlaced material destined for interlaced display - what do you think happens during live broadcasts? Transitions look best if synchronized to fields, though.

[midiguy]

I see... so I suppose it will be ok then.. the question remains though:
should I deinterlace? I get the feeling much of the effects I use (such as transparencies of 2 video streams playing at once) will look better without the interlacing. maybe I just have something up my ass, I dunno.. anyways, thanks for all the help people, but is it a good idea to deinterlace or leave it interlaced how it is?

*edit* just thinking about you live broadcast example, I have seen many live broadcasts use the cross fade transition many many times, and that is combining two video streams together and using transparencies, and it looks fine. I was just thinking that maybe since I am messing with the video like that, it would mess up how the television detemrines the fields to display or what not..






i'm not making sense today. I can't even write a damn sentence properly..

[mpucoder]

Of course, in live television we keep the sources synchronized, so that is never a problem. For offline editing transitions involving 2 or more sources the sources get aligned by frame, so correct field order is very important. That should not be a problem if everything came from the same source originally, or looks OK by itself.

As for deinterlacing - I wouldn't, since it is intended for television. But the best way to determine that is to try a test clip, both with and without deinterlace.

[midiguy]

yes. everything is from the same source. thanks for your help with this. I think I get it now. let me throw one more at you, what about image or text overlays? meaning, I put a logo or something over moving video. will I experience any combing with that?

[Guest]

Stop agonising and just try stuff! That's how you'll learn about the basic concepts, of which you seem to have a very poor understanding . :)