Odd interlacing problem

Hagaren Viper · Post by **Hagaren Viper** » Thu Dec 27, 2007 2:59 pm

So I started making this AMV as I usually did. And then I finished it.

And THEN I read the 'A&E's Technical Guide' XD

So basicly I didn't do any de-interlacing or anything when I technicly should have. I'm attempting to do that now that I'm finished (Becasue there is NO way that I'm remaking the whole thing). Of course, I don't know if deinterlacing beforehand would have helped this.

As seen above, I have some weird interlacing in some parts that I just can not get rid of. In this particular scene, I overlayed the girl on the right over another clip, then had it move slowly to the side. When it moves to the side, there is some odd interlacing or something that pops up (This picture looks a bit worse blockier do to the encode, for some reason) . I've gone through the guide and tried different things, but either I'm missing something or.....something. Any imput?

BasharOfTheAges · Post by **BasharOfTheAges** » Thu Dec 27, 2007 5:48 pm

I'm not sure what you can do after the fact. When it's on the DVD, the interlacing is all set from beginning to end. When you work with interlaced footage time manipulations, movement of video tracks, overlays, they all take that interlacing and compound the problem. If you have a very simple video you might be fine - if not you're going to have to work really hard, segment by segment to deinterlace it all.

Qyot27 · Post by **Qyot27** » Thu Dec 27, 2007 6:48 pm

I suppose one solution might be to run a deinterlacing script on each clip in your source, if you still have them, that is (and then switch out the old copies for the new ones before firing up the editing program again). Granted, I don't think it can be entirely remedied at this point, but that might provide *some* degree of improvement.

Often when I come across videos with interlacing artifacts (admittedly, this doesn't happen too often, and even less often now than it did a couple years ago) I'll run a deinterlacer over the whole video during the process of converting it to DVD - sometimes this works, sometimes it doesn't. If it's simple enough interlacing, then something like TomsMoComp(1,15,1) might help. Beyond that, there's probably not much.

One thing you might want to try, judging from the type of artifacting I'm seeing in that clip, is TIsophote (http://web.missouri.edu/~kes25c/). Just be sure not to set it too high.

Hagaren Viper · Post by **Hagaren Viper** » Fri Dec 28, 2007 12:14 am

Alright, I'll probablly try doing some 'o that when I get the time.

I've been wondering though...maybe it is Vegas? Because I started a new project, and I've been sending all my footage through Avisynth using the guide, making it look pretty, yada yada. One of the things I do is remove interlacing, but if I put it in Vegas and put some kind of effect on it (I'll speed it up for example), there is the interlacing again. I'll render it, and it's still there. There's some option in the prefrences that asks what deinterlacing type you want, but it doesn't seem to make much diffrence.

So am I just doing something wrong?

BasharOfTheAges · Post by **BasharOfTheAges** » Fri Dec 28, 2007 1:47 am

I'm not exactly sure how it works in Vegas, but I know in Premiere there are settings for interlacing speed changes. Turning that off is a good idea - though, again, i'm not sure if it's even an issue with Vegas.

Qyot27 · Post by **Qyot27** » Fri Dec 28, 2007 1:45 pm

From a very cursory Google search, it seems that Vegas interpolates footage by default, and some people have reported this looking like interlacing (what it actually is is apparently frame blending). The solution they gave was to right-click the video on the timeline, select 'Switches' and turn off resampling. I'm just quoting that verbatim.

I can't test this, as I don't have Vegas. I would assume that it might be possible to highlight multiple entries and then proceed (although you might have to find 'Switches' in a program menu rather than right-clicking), so you only have to do it once. This is certainly true for Premiere's 'Deinterlace under 100%' issue, where you can highlight the entire timeline, go to one of the program menu entries and find the area that deals with it, rather than right-clicking, Clips, and unchecking that option for every single clip on the timeline.

prYzm · Post by **prYzm** » Sat Dec 29, 2007 7:57 am

yeh to clarify the vegas issue, whenever you change the playback rate of a clip no matter the size. make sure u right click on your segment, go to the properties, and click the option 'disable resample'. otherwise it will screw up your clip.