欢迎各位兄弟 发布技术文章

这里的技术是共享的

H5截取视频第一帧作为预览图片 但是好像手机浏览器不行 手机浏览器好像不认识 canvas 有大用 有大用

下面这个其实是默认第一
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>capture screen</title>
</head>
<body>
<video id="video" controls="controls">
<source src="123.mp4">
</video>
<div id="output"></div>
</body>
</html>


H5的video标签来播放视频。请问如何自动截取视频的第一帧作为视频的预览图片?

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>capture screen</title>
</head>
<body>
<video id="video" controls="controls">
<source src="123.MP4">
</video>
<div id="output"></div>
<script type="text/javascript">
(function(){
var video, output;
var scale = 0.8;
var initialize = function() {
output = document.getElementById("output");
video = document.getElementById("video");
video.addEventListener('loadeddata',captureImage);
};
 
var captureImage = function() {
            var canvas = document.createElement("canvas");
            canvas.width = video.videoWidth * scale;
            canvas.height = video.videoHeight * scale;
            canvas.getContext('2d').drawImage(video, 0, 0, canvas.width, canvas.height);
 
            var img = document.createElement("img");
            img.src = canvas.toDataURL("image/png");
            output.appendChild(img);
};
 
initialize();
})();
</script>
</body>
</html>


来源:https://developer.mozilla.org/en-US/docs/Web/HTML/Element/video
演示https://www.youtube.com/watch?v=-ZZtYNIwYBU&feature=player_detailpage#t=194s






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