I’m trying to create something for a video and when I do this kind of thing to move text or images to match the movement of the video, I get those black backgrounds when exporting, can they be removed?
you don’t see those boxes in the editor
If you are using the Position and Zoom effect to move text or images this is unfortunately to be expected. There is something wrong with how the effect is implemented (Kdenlive or MELT).
Use the Transform effect instead. I suggest you add Transform to the effect stack, then copy the keyframes from the PaZ effect to the Transform effect, temporarily disable the PaZ effect to check whether the keyframes copied over ok, and if that’s good delete the PaZ effect from the clip.