How do I add a video time trigger to control other symbols?

Question

I would like to use a video to trigger when other Symbols appear on the Stage at different times in the video. I've used the following code:
       var vid = sym.$("VideoSymbolName")[0];
       vid.addEventListener("timeupdate", function() {
             if (this.currentTime >= 4) {
               // Do Something This code loads a symbol into a container
                  var firstS = sym.createChildSymbol("SymbolName", "ContainerName");
        }, false);
However, that loads the picture repeatedly, and several instances appear on the stage, so I tried using this code:
       var vid = sym.$("VideoSymbolName")[0];
       vid.addEventListener("timeupdate", function() {
             if (this.currentTime >= 4) {
               // Do Something This code loads a symbol into a container
                var con= sym.$("PicPortal");
                con.empty();
                  var firstS = sym.createChildSymbol("SymbolName", "ContainerName");
        }, false);
However, that makes the loaded Symbol "flash", as it is constantly loaded and unloaded in the container.
Any other ideas?
Thanks

Answer 1

The only method available to show current time in Keynote used Quartz Composer, however the current version of Keynote 6.2, does not support Quartz.