capture image from html5 video especific second js

Question

I have this code to take a capture of a html5 video,

The problem is that I want to take a capture by default...for example in the second 3.

How Do I do this?

 function capture(){ var canvas = document.getElementById('canvas'); var video = document.getElementById('video'); canvas.getContext('2d').drawImage(video, 0, 0, video.videoWidth, video.videoHeight); } 

 <video id="video" src="http://www.w3schools.com/html/mov_bbb.mp4" type="video/mp4" controls></video><br/> <button onclick="capture()">Capture</button> <br/><br/> <canvas id="canvas"></canvas> <br/><br/> 

Answer 1

You can set the current time of the video before taking the screenshot with video.currentTime = <sec>

The solution isn't that great, it needs some time before taking effect, I tried a double requestAnimationFrame which usually is enough to let the browser do its work, but wasn't in my testing

 function capture(){ var canvas = document.getElementById('canvas'); var video = document.getElementById('video'); video.currentTime = 3; setTimeout(function(){ canvas.getContext('2d').drawImage(video, 0, 0, video.videoWidth, video.videoHeight) }, 500) } 

 <video id="video" src="http://www.w3schools.com/html/mov_bbb.mp4" type="video/mp4" controls></video><br/> <button onclick="capture()">Capture</button> <br/><br/> <canvas id="canvas"></canvas> <br/><br/>