Movie Playing multiple audio tracks & echoing

Question

I have a movie that is in a symbol that i want to play after a set amount of time by using setInterval. The function works - but when it shows the symbol and plays - it plays multiple audio tracks at the same time - sounding like an echo and or a 1-2 second delay on the same audio track. It also seems the audio starts playing on the main root without actually triggering the playhead of the video symbol.
Following is the code i am using for both timer and the video. Any pointers?
// interval
         var timer = setInterval(onTimer,10000);
         var mysymbol = sym.getSymbol("btn1_video");
         // function
         function onTimer() {
            // clear last interval
            clearInterval(timer);
            // action
            sym.$("btn1_video").show();
//and on on the movie symbol timeline trigger:
var vid = $("<video width='818' height='460' autoplay='autoplay' preload='auto' controls='controls' id='videoID'>" +
"<source src='video/testvideo.m4v' type='video/mp4' />" +
    "<source src='video/testvideo.webm' type='video/webm' />" +
   "<source src='video/testvideo.ogg' type='video/ogg' />" +
   "This browser is not compatible with HTML 5" +
"</video>");
sym.$("btn1_video").append(vid);

Answer 1

You identified the problem. I thought that you had to highlight the first song to get the playlist going, but all that does is make the first song repeat itself. Thanks for the guidance.