<!DOCTYPE html>
<html lang="en-US">
<body>
<video style="width:100%;height:330px" onratechange="myFunction()" controls>
<source src="/hawk.mp4" type="video/mp4">
</video>
<button onclick="slowFunction()">0.5X</button>
<button onclick="speedFunction()">2X</button>
<script>
var x = document.getElementsByTagName("video")[0];
function slowFunction(){
x.playbackRate = 0.5;
}
function speedFunction(){
x.playbackRate = 2;
}
function myFunction(){
alert("Playing speed is changed");
}
</script> </body>
</html>