I can show a still image with a green background if I put it in a song allowing the camera to display the speaker on the LiveStream with the image on the Front of House display. So how do I do this with a video, because instead of displaying a green screen, it just displays a black one instead. So I can't see the speaker on the alt output.

Hi, I've worked it out and managed to get it to work as I wanted. Still using a song, 1st verse is the video and second verse is a image file,  set both slides to background media use with 1st slide to automatically advance after video length which finishes with the 2nd slide containing the image.

I don't know how it was originally giving a black image but works now.