How to check real (unique) frame rate, just before jit.window?

    May 28 2011 | 10:39 am
    I am trying to increase the frame rate of my video, with effects such as jit.slide and jit.scanslide. I put a jit.matrix @thru 0 before. This way I can use the envelope effect to create more frames which are unique (am I right?). This seems to work but I dont want to overload jit.window with frames with are not unique.
    What should I do?
    Thanks for help wo