JS Webcam Flicker/Ghost Blocker Random Octave SRC

<center>
<body bgcolor="black" onmousemove="drawe();" onmousedown="drawe" onchange="drawe" ondoubkeclick="drawe;">
<video id="video" autoplay hidden>
</video>
<canvas id="canvas" onchange="drawe;" topmost=false onchange="drawe;" width="500" height="500" style="opacity:1.0;fillColor:none;">
<script>
var ii=1;
var inn=244;
var video = document.getElementById("video");
var c = document.getElementById("canvas");
var ctx = c.getContext("2d");
var canvas = document.getElementById('canvas');
var context = canvas.getContext('2d');
var video = document.getElementById('video');
var mediaConfig = { video: true,audio:false};
function drawe(){
var possible = "FABCGDE0123456789";
var text = "";
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
for(var i=0; i!=6; i++)
text+=possible.charAt(Math.floor(Math.random()*possible.length))
ctx.strokeStyle="#"+text;
ctx.moveTo(event.x+4,event.y-4);
ctx.lineTo(event.x+4,event.y-1);
ctx.topmost=true;
text='';
}
navigator.mediaDevices.getUserMedia(mediaConfig).then(function(stream) {
video.src = this.window.URL.createObjectURL(stream);
video.play();
video.addEventListener("play", function() {i = window.setInterval(function() {
canvas.style.opacity=Math.random()*1.1

ctx.topmost=false;
  ctx.drawStyle=''
ctx.drawImage(video,ii--,ii++,500,500)},1);
ctx.draw();
drawe;
}, false);
});
</script>
  <script>
var context = new AudioContext();
var lfo = context.createOscillator();
lfo.frequency.value = Math.random()*12;
var hfo = context.createOscillator();
hfo.frequency.value = Math.random()*450;
var modulationGain = context.createGain();
modulationGain.gain.value = Math.random()*122;
lfo.connect(modulationGain);
modulationGain.connect(hfo.detune);
hfo.connect(context.destination);
hfo.start(0);
lfo.start(0);
</script>