【发布时间】：2023-01-08 08:19:32
【问题描述】：
我正在编码 youtube 视频下载器 chrome 扩展。但是youtube把mp4和mp3分开了。如何将接收到的 blob 类型的音频文件和图像文件组合起来，并将其转换为有声视频？
async function downloadFile(urlToSend) {
return new Promise(resolve => {
var req = new XMLHttpRequest();
req.open("GET", urlToSend, true);
req.responseType = "blob";
req.onload = function (event) {
// var blob = req.response;
// var fileName = req.getResponseHeader("fileName") //if you have the fileName header available
// var link = document.createElement('a');
// link.href = window.URL.createObjectURL(blob);
resolve(req.response)
};
req.send();
})
};
async function zfc() {
var v = await downloadFile('/videoplayback.mp4')
var a = await downloadFile('/videoplayback.weba')
let newBlob = new Blob([v, a], { type: 'video/mp4' })
var as = document.createElement('a')
as.href = window.URL.createObjectURL(newBlob)
as.download = window.URL.createObjectURL(newBlob)
console.log(as)
console.log(newBlob)
// as.click()
var c = document.createElement('video')
c.src = window.URL.createObjectURL(newBlob)
document.body.appendChild(c)
}
zfc()【问题讨论】：
标签： javascript ajax blob