Can Material generate a key signal

Graphics & Virtual
1

Hello all… Not sure how to explain this correctly.

We get our credits roll as a video clip (IT HAS NO KEY SIGNAL EMBEDDED); it’s just white text over black; which I import into XPression. Our TD then takes XP (playing credits clip) and creates a linear key (in the switcher) so that he can key credits over camera.

I was thinking why can’t XPression do this. I made a new material with the video clip referenced. Changed the Blending Mode for Layer1 (in the material) to "Additive (Linear Dodge). This did make my white text keyable on my canvas; but when I put that scene to output the white text was not keyable. It was only keyable on my canvas.

I’m not sure 100% why this wouldn’t work. Any thoughts would be appreciated.

Thank you.

2

Easiest might be to do it when importing in the Coder app? Set the alpha source to be the same as the fill, since it’s white over black and then output as a 32bit avi?

3

Could you us it as the source of a mask? You could apply it to a mask layer and it would “cut the hole” for your credit roll.Following this one

4

Thanks Paul; your suggestion did work perfectly.

5

Hi Malcolm, that’s a great idea. I look forward to trying it in the future.