我想问为什么我不能在这个画布中运行两个不同的视频源,即.ogg和.mp4文件.我试图将此绿屏视频覆盖到另一个隐藏了背景颜色的视频.
<html>
<head>
<script type = "text/javascript">
function load() {
var get1 = document.getElementById("c1");
var set1 = get1.getContext("2d");
var get2 = document.getElementById("c2");
var set2 = get2.getContext("2d");
var video1 = document.getElementById("video1");
var video2 = document.getElementById("video2");
video1.addEventListener('play', function(){runVideo();});
video2.addEventListener('play', function(){runVideo2();});
var runVideo1 = function() {
if(video1.paused || video1.ended) {
return;
}
var frameconversion = function() {
if(window.requestAnimationFrame) {
requestAnimationFrame(runVideo1);
} else {
setTimeout(runVideo,0);
}
};
};
var runVideo2 = function() {
if(video2.paused || video2.ended) {
return;
}
var frameconversion2 = function() { …