SOURCE

window.URL = window.URL || window.webkitURL;
// videojs 简单使用
var player = videojs('myVideo');
player.src("https://video.qwjiaoyu.com/liveRecord/VOD_NO_TRANSCODE/henanyizhuan/huliclass-2/2022-03-28-08-01-48_2022-03-28-11-54-16.m3u8");
player.on('loadedmetadata', function () {
    var videoLength = player.duration();
    console.log(videoLength)
});

function getDuration(url) {
    console.info(url);
    var video = document.createElement('video');
    video.preload = 'metadata';
    video.onloadedmetadata = function () {
        window.URL.revokeObjectURL(video.src);
        alert("Duration : " + video.duration.toFixed(2) + " seconds");
    }
    video.src = url;
}

<input type="button" value="videoInfo" onclick="getDuration('https://video.qwjiaoyu.com/liveRecord/VOD_NO_TRANSCODE/henanyizhuan/huliclass-2/2022-03-28-08-01-48_2022-03-28-11-54-16.m3u8')"></input>

<div>
    <video id="myVideo" class="video-js vjs-default-skin vjs-big-play-centered" style='display:none;'>
         
    </video>
</div>