I'm trying to apply a cross fade transition between two clips. As far as I know, cross fade means that it's supposed to fade out the first clip and then fade in the second one. But instead, the first clip cuts to black, then starts to fade in. It then cuts to the second clip, with the fade-in continuing. So instead of a proper cross fade, I have a fade-in lying across the joint between two clips.
What am I doing wrong?