First suggestion: disable depth testing in your jit.gl.videoplane objects.

As mentioned before, depth buffers are not necessarily up to our control on windows, as under many circustances, they are always created by the driver regardless of our request. Whenever you want to do transparent, composited videoplanes, I'd recommend @depth_enable 0

both of the videoplanes in that example have @depth_enable 0 set. it's still not working. setting it explicitly on the render object still doesn't make it work. as soon as i set @blend_enable 1 on a videoplane, it vanishes.

aha. thank you luke. it would appear that jit.dx.grab on windows 7 outputs a blank alpha channel instead of a white one. using a jit.op @op ~ pass pass pass after the jit.dx.grab solves the problem in this patch.

Thanks for tracking down. We'll look at enforcing a white alpha in a future update.