Created
February 3, 2012 09:48
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HTML5 Video Preview Drawing
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<!DOCTYPE html> | |
<html> | |
<head> | |
<title>HTML5 Video Demo</title> | |
<script type="text/javascript"> | |
var MAX_FRAMES = 9; | |
var PREVIEW_FACTOR = 6; | |
var currentFrame = 1; | |
document.addEventListener("DOMContentLoaded", createVideoPreview ); | |
function createVideoPreview () { | |
var video = document.createElement("video"); | |
video.onloadeddata = function() { | |
var start = video.seekable.start(0); | |
var end = video.seekable.end(0); | |
currentFrame = 1; | |
var even = ( end - start ) / (MAX_FRAMES + 1); | |
copyVideoFrameAt( video, even ); | |
}; | |
video.id = "player"; | |
video.src = "media/elephants_dream.mp4"; | |
video.controls = true; | |
video.play(); | |
} | |
function copyVideoFrameAt (video, even) { | |
var time = even * currentFrame; | |
video.pause(); | |
video.currentTime = time; | |
if( currentFrame > MAX_FRAMES ) { | |
video.currentTime = 0; | |
document.getElementById('video').appendChild(video); | |
video.play(); | |
return; | |
} | |
setTimeout( function() { | |
var canvas = document.createElement("canvas"); | |
canvas.width = video.videoWidth / PREVIEW_FACTOR; | |
canvas.height = video.videoHeight / PREVIEW_FACTOR; | |
var surface = canvas.getContext("2d"); | |
surface.drawImage(video, 0, 0, canvas.width, canvas.height); | |
document.getElementById("videoPreview").appendChild(canvas); | |
currentFrame++; | |
copyVideoFrameAt(video, even); | |
}, 1000); | |
} | |
</script> | |
</head> | |
<body> | |
<h2>Preview</h2> | |
<div id="videoPreview"> | |
</div> | |
<h2>Video</h2> | |
<div id="video"></div> | |
</body> | |
</html> |
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