个回答

• 橙子111000

  2017-10-20 15:14:02

  var context = canvas.getContext('2d');
  var video = document.createElement('video');
  video.src = '吔屎吧梁非凡_x264压制.mp4';
  video.preload = 'preload';
  video.autoplay = 'autoplay';
  video.height = context.canvas.height;
  video.width = context.canvas.width;
  
  setInterval(function  () {
      var pattern = context.createPattern(video, 'no-repeat');
      context.fillStyle = pattern;
      context.fillRect(0, 0, context.canvas.width, context.canvas.height);
      pattern = null;
  
      //drowStar...这里执行其他绘画步骤
  
  }, 100);

  测试可用，setInterval的时间间隔尽量调大，不然电脑风扇会狂飙...

  楼上的方法应该更高效吧 XD
  

  0

• 蝴蝶飞不过沧海

  2016-07-09 17:11:43

  var can = document.getElementById('canvas');

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

  var video = document.getElementById('video');

  video.addEventListener('play', function(){

      can.width = video.clientWidth;
  

      can.height = video.clientHeight;
  

      var ths = $(this);
  

      (function loop(){        

          if(!ths.paused && !ths.ended){

              ctx.drawImage(ths, 0, 0);
  

              setTimeout(loop, 1000/30);
  

          }

      })();    

  }, false)
  

  
  

  0