标签：提取 img url cvs 画面 视频文件 const document vdo
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
img{
width: 50px;
height: 50px;
}
</style>
</head>
<body>
<input type="file" name="" id="">
<script>
function captureFrame(videoFile,time=0){
return new Promise(resolve=>{
const vdo=document.createElement('video')
vdo.currentTime=time;
vdo.muted=true;
vdo.autoplay=true;
vdo.src=URL.createObjectURL(videoFile)
// console.log(vdo.src);
vdo.oncanplay=()=>{
const cvs=document.createElement('canvas')
cvs.width=vdo.videoWidth;
cvs.height=vdo.videoHeight;
const ctx=cvs.getContext('2d')
ctx.drawImage(vdo,0,0,cvs.width,cvs.height)
cvs.toBlob((blob)=>{
const url=URL.createObjectURL(blob)
resolve({
blob,url
})
})
}
// return {
// url:,
// blob:''
// }
})
}
const inp=document.querySelector('input[type=file]')
inp.onchange=async (e)=>{
const file=e.target.files[0]
for (let index = 0; index < 10; index++) {
captureFrame(file,index*5).then(result=>{
previewImage(result.url);
})
}
}
function previewImage(url){
const img=document.createElement('img')
img.src=url
document.body.appendChild(img)
// const reader=new FileReader()
// reader.readAsDataURL(file)
// reader.onloadend=()=>{
// const img=document.createElement('img')
// img.src=reader.result
// document.body.appendChild(img)
// }
}
</script>
</body>
</html>
标签：提取,
img,
url,
cvs,
画面,
视频文件,
const,
document,
vdo
From： https://www.cnblogs.com/7c89/p/18169676