Video overlay

vvvv beta question
1

Hello !

i searched the forums a lot but i cant find a solution.
So here is the problem:

i want to overlay to videos: think of a portrait of a head + a landscape
i tried chroma keying the head but, it keeps a black background, there does not seem to be transparency,
i tried a lot of solutions from the forums, but none worked.
greetings and thanks

2

try to use a ChangeFormat(EX9.Texture) with format A8R8G8B8 before applying the key.
some textures don’t have an alpha channel (which is why the background stays black). using this node you can add the missing alpha channel.