Still Keyin'
 

Hi there,

A few weeks ago I had asked about keying in After Effects. I've been really slugging it out for a green screen commercial and getting okay results when I want stupendous.

Basically, I shot the footage 1080i60/35mb at about F5. I'm trying to key out a well-lit background so that it appears my actors are on a white background.

The key is working fine in AE, using Keylight. The problem is - I get these "crawling" edges that I just can't seem to dispose of. I've bought a book on keying in AE (After Effects studio techniques) and haven't been able to fix my problem. I want solid edges. It is particularily bad when the actors have slightly frizzier hair.

I've read that the XDCAM HD is a great keying camera, and I've read that no one in their right mind would key with an HDV camera.

Has anyone done some serious keying and do they have a recipe for me?

Thanks - I also have Shake and could do it in that if it proved to be better with Primatte.

Thanks!
Max

Is After Effects interpreting the interlaced footage correctly? That is, it's understanding your source footage to be 29.97 interlaced, upper field first, as opposed to seeing it as 29.97 progressive

If not, the crawling edges you describe could be AE not sorting your source into two separate fields first.

Try this

http://www.creativecow.net/articles/...rkey/index.htm

Takes a while to get through the commercials, but well worth the effort.

Jim

nate - yes, I'm being sure to check that AE is interpreting correctly. I actually set the interpretation to upperfields, with preserve edges on. Just for fun, I tried turning it off and it didn't look any better.

jim- thank you for that link. That is some good information, and well presented. Unfortunately, neither of those techniques was enough to get rid of the crawl. Pre-screen blur and a little choke is just the recipe, but it is just not enough. I still see a lot of crawl even in SD - don't even mention the HD.

Anyone had good results?

One thing I'm realizing is that I'm reading repeatedly that I should have shot in 24p. Oh well, live and learn.

Thanks,
max

We keyed the entire season of Cowboy Mounted Shooting when we were shoting the color commentators "in the booth" using 3 JVC100HDs and had absolutely no problems at all. I don't have the solution but did want you to know that we've keyed with both the 100HD and the 350s we shoot with now and the results are perfect so it can be done with either level of camera.

Perhaps I could post a very short clip of the video we shot. Maybe my shooting wasn't so good or something. Would there be anyone that could take a hit at it?

I really want to get to the bottom of this situation as this is something we do quite a bit.

Thanks!
Max

At least post a still at 100%

Nate's correct. Let's see the symptoms and maybe we can come up with a cure.

Still Keyin'
 

Are you using the XDCam codec in AE or are you using DVCPro HD etc.?
I've noticed the the native XDCAM 35mbs codec works horribly in AE. I have not done any green screen compositing yet. When using the native codec I noticed an immediate degregation in the footage and you cannot render (at this point) in the native 35mb codec, it won't playback. I'm told it's a quicktime issue at this point.

I had to redigitize my footage in the DVCpro HD codec and I got very good results.

Anybody else having any success with XDCAM in AE?

Hey there -

Please see a screen still in .png format (I hope this is the right format, I could use something else) at http://www.handcrankfilms.com/images/C0062.png - this was taken directly from my XDCAM 35/mbr 1080i60 timeline.

I'd be happy to post a very short clip of the jaggies I'm getting if that is needed. Just let me know what format I should post 'em.

Jay -

I'm really glad you brought this up. I brought this up about a month ago when I was doing tests but people kept saying how great XD and AE were working together. My results are the same as yours. I did finally wind up converting to DVCPROHD, just as you have, to get even halfway decent results. Yes, AE will recognize and even play (sort of) my XDCAM 35, but the jaggies are pretty brutal. And, yes, I can export in the XDCAM 35 codec from AE to FCP, but again, as you say, it will not play back in realtime even though you get a gray (as in "render ready") bar.

I really have tried every concotion of ways, doing everything solely in XDCAM, converting to DVCPROHD, etc., etc. Of course, if other people are getting good results, then there is still something I'm missing.

Thanks very, very much fellas.

Max

What are you monitoring with? Crawl is often a monitoring issue.

For NTSC monitoring, a Sony PVM14M2U, for HD monitoring, Apple 23" HD.

BTW, you can see the crawling pretty clearly even in the AE preview composition window.

Thanks,
Max

Define crawling.

Is it what you see on the edge of his forehead and nose?

I see that there, but no. Really it is along the edges of her hair for one thing, when the key is in place and the footage is rolling. Basically, it looks like little ants are crawling along her hairline. Very, very little ants. In a freeze frame, you wouldn't see it. I just posted that image so that people could see that it was in fact a decent key setup we were working from.

Thanks,
Max

I would suggest shooting in 30P and see what you get. I suppose the 60i can be leaving you with some ugly 4:2:0 artifacts. Adam Wilt seems to think that progressive scan is better for 4:2:0.

-gb-