html5：在画布中显示视频 [英] html5: display video inside canvas

问题描述

是否可以将html5视频显示为画布的一部分？

is it possible to display a html5-video as part of the canvas?

基本上与在画布上绘制图像的方式相同。

basically the same way as you draw an Image in the canvas.

context.drawVideo(vid, 0, 0);

谢谢！

推荐答案

var canvas = document.getElementById('canvas');
var ctx    = canvas.getContext('2d');
var video  = document.getElementById('video');

video.addEventListener('play', function () {
    var $this = this; //cache
    (function loop() {
        if (!$this.paused && !$this.ended) {
            ctx.drawImage($this, 0, 0);
            setTimeout(loop, 1000 / 30); // drawing at 30fps
        }
    })();
}, 0);

我猜上面的代码是自解释的，如果没有在下面放一个注释，上面几行代码

I guess the above code is self Explanatory, If not drop a comment below, I will try to explain the above few lines of code

编辑：

这里是一个在线示例，只是为了：）

演示

Edit :
here's an online example, just for you :)
Demo

var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var video = document.getElementById('video');

// set canvas size = video size when known
video.addEventListener('loadedmetadata', function() {
  canvas.width = video.videoWidth;
  canvas.height = video.videoHeight;
});

video.addEventListener('play', function() {
  var $this = this; //cache
  (function loop() {
    if (!$this.paused && !$this.ended) {
      ctx.drawImage($this, 0, 0);
      setTimeout(loop, 1000 / 30); // drawing at 30fps
    }
  })();
}, 0);

<div id="theater">
  <video id="video" src="http://upload.wikimedia.org/wikipedia/commons/7/79/Big_Buck_Bunny_small.ogv" controls="false"></video>
  <canvas id="canvas"></canvas>
  <label>
    <br />Try to play me :)</label>
  <br />
</div>

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