当我试图获取屏幕截图并将其保存为PNG,然后将视频上传到服务器,我遇到以下问题
希望你能解决我的问题
/*Output image show view*/
$('#file_browse').change(function(e){
getVideo(this);
});
var capbtn = document.querySelector('#video_capture');
var video = document.querySelector('video');
var canvas = document.querySelector('canvas');
var context = canvas.getContext('2d');
var w,h,ratio;
video.addEventListener('loadedMetadata',function() {
ratio = video.videoWidth / video.videoHeight;
w = video.videoWidth - 100;
h = parseInt(w / ratio,10);
canvas.width = w;
canvas.height = h;
},false);
capbtn.addEventListener("click",function(){
context.fillRect(0,w,h);
context.drawImage(video,h);
var objImageData = canvas.toDataURL("data:image/png;");
});
function getVideo(input) {
if (input.files && input.files[0]) {
var reader = new FileReader();
reader.onload = function (e) {
var video = document.getElementsByTagName('video')[0];
var sources = video.getElementsByTagName('source');
sources[0].src = e.target.result;
video.load();
video.style.display="block";
}
reader.readAsDataURL(input.files[0]);
}
}
<input id="video_capture" type="submit" value="Capture" />
<video id="video_view" controls>
<source src="movie.mp4" type="video/mp4">
</video>
<canvas width="300" height="300"></canvas>
解决方法
听起来像CORS问题.
视频与Web服务器的起源不同.
如果您可以在响应中包含“Access-Control-Allow-Origin：*”头像,您可以设置video.crossorigin =“Anonymous”,那么您可以将其关闭.
我使用Charles Web Proxy将标题添加到我想要使用的任何图像或视频中.
见https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image
另见https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_settings_attributes
这是一个小提琴工作与图像：http://jsfiddle.net/mcepc44p/2/
var canvas = document.getElementById("canvas").getContext("2d");
var button = document.getElementById("button");
var image = new Image();
image.crossOrigin = "anonymous"; // This enables CORS
image.onload = function (event) {
try {
canvas.drawImage(image,200,200);
button.download = "cat.png";
button.href = canvas.canvas.toDataURL();
} catch (e) {
alert(e);
}
};
image.src = "https://i.chzbgr.com/maxW500/1691290368/h07F7F378/"
这是你要找的吗？
