Something Dafydd said about the empty places on a track being just emptiness has me puzzled.

If I plop an image into a track, and the image is smaller than the video dimensions, the image is surrounded by black. Furthermore, that blackness is opaque (it will cover underlying tracks). So in this case, "nothing" is black and opaque.

I think I understand this, but that leaves me puzzled about Dafydd's statement. Jerry Schwartz