javascript - Duration of Video in Express.js: NaN -


i trying total duration of video, in express.js. below have shown code in jade. include video in webpage.

video(width='320', height='240', controls='controls')        source(src='/images/video.mp4', type='video/ogg', id='thevideo')

then call folowing function on button click. 

function getcurrenttime() {     var video = document.createelement('video');     var time = video.duration;     document.getelementbyid('mytime').value=time;    }

'mytime' text box.

input(id='mytime', size='5')

but when run video, duration nan. tried read posts on why happens, , apparently related "byte" problem, or sending headers or that. can please explain me reason why happening , how can fix it? thanks.

try this:

jade:

video(width='320', height='240', controls='controls', id='thevideo')    source(src='/images/video.mp4', type='video/ogg')

js:

window.addeventlistener('load', function(){      var video = document.getelementbyid('thevideo');      video.addeventlistener('loadedmetadata', function() {          console.log(math.round(video.duration));      }); });

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