If you have the video extend to where the corners are rounded, you must use a "rounded clip" on the video ontop of the shadow region (since they butt). That me

If you have the video extend to where the corners are rounded, you must use a "rounded clip" on the video ontop of the shadow region (since they butt). That means you have to power up the 3d part of the GPU to do that (because the renderer does it in shaders). Where as if you add some 9 pixels of black above/below to account for the rounded corner, there is no clipping of the video and you can use hardware scanout planes. That's important because keeping the 3d part of the GPU turned off is a huge power savings. And the scanout plane can already scale for you to the correct size.