I'm afraid you're taking it as an article of faith that Ultra Key works fine under all conditions.
A lot of work goes into getting a successful chroma key shot, good chroma key lighting being the absolute most important one. Adequate distance from the chroma key background to reduce spill is a close second. Without a screen capture of the original green screen shot, it's tough to diagnose what you did. But if you just put people in front of a green screen, shot and hoped for the best, I think you're running into green spill problems that won't be solved by a one-step keyer.
You may have to take the shot into After Effects, cut the shot up into various pieces using animated masks to get the keys straight, or you may even have to do some rotoscoping.
Hi Dave, I wasn't taking it as an article of faith that the filter would work for me and am very pleased its worked as well as it did considering the contraints in time and space that I had shooting this.
Whats interesting is how close I got to making this work first go and how adding a little tweak caused the encoder add these artifacts.
I fugure more research is in order regardless, and hope to learn more about what would cause that issue.
I have only looked at After Effects on other systems it did not come with the package my work bought for me.
Thanks for you suggestions.
I should have mentioned the 30 Keyframes are not applied to the Ultra key, they are scaling and lighting effects on the same clip, the matte looks good, in the preview pane and the artifacts do not show up in the preview either.
If this was After Effects, I'd say, "turn off Open GL for rendering".
What happens if you disable some of those many effects you applied to the chroma key shot and just render out the Ultra Key?
Have you tried animating a garbage matte around the subjects?
What does the original shot look like: is it lit properly for chroma key?
Wow this is warped. Copied the segment and systematically removed things, the problem persisted even with the Ultra Key taken out! Next to go was the lighting effect (nothing left) problem gone.
So Ive completed the project minus the lighting effect and am pretty happy, the Ultra Key looks great!
The pattern BTW is similar to the emboss filter and it IS a single frame of the clip with turned upside down, I've matched the patterns using layers in photoshop.
This was buggy, either its my graphics card or Premiere I figure