JSFiddle - React, Tailwind, and code Playground

HTML

<video id="audio-element" controls> 
  <source src="https://azureblobstoragecomcast.blob.core.windows.net/blobcomcast/TGPATOML1801H.mpg" type="video/mpeg">
  Your browser does not support the audio tag.
</video>
<br>
<button onclick="duration();">Get Duration</button>

JavaScript

function duration()
{
    var audio = document.getElementById("audio-element");
    if(audio.readyState > 0) 
    {
        var minutes = parseInt(audio.duration / 60, 10);
        var seconds = parseInt(audio.duration % 60);
        
        alert(minutes+":"+seconds);
    }
}