FOSDEM

XVideo with color keying has been notoriously problematic in the past (multiple heads, size restrictions, etc.), and it doesn't work well with composited desktops.

For OpenGL-based compositing window managers like compiz and for OpenGL-based Xservers like Xgl the most straight-forward solution is to use OpenGL for doing the color conversion and scaling on-the-fly. On the other hand, OpenGL is so flexible that there is more than a single way to implement this - and all techniques have their advantages and drawbacks.