该示例把三个视频合并为一个视频,在客户端按视频拼接顺序播放。实现了,使用边缘函数获取多个远程资源,并流式读取与拼接,最终流式响应客户端。
示例代码
async function combine(readableVideos, destination) {for (const readable of readableVideos) {// 流式响应await readable.pipeTo(destination, {preventClose: true});}const writer = destination.getWriter();writer.close();writer.releaseLock();}async function handleRequest(request) {// 视频片段地址const urls = ['https://laputa-1257579200.cos.ap-guangzhou.myqcloud.com/stream-01.mov','https://laputa-1257579200.cos.ap-guangzhou.myqcloud.com/stream-02.mov','https://laputa-1257579200.cos.ap-guangzhou.myqcloud.com/stream-03.mov',];const requests = urls.map(url => fetch(url));const responses = await Promise.all(requests);// 获取视频片段的可读流const readableVideos = responses.map(res => res.body);const { readable, writable } = new TransformStream();// 合并视频combine(readableVideos, writable);return new Response(readable, {headers: {'content-type': 'video/mp4',}});}addEventListener('fetch', event => {event.respondWith(handleRequest(event.request));});
示例预览
在浏览器地址栏中输入匹配到边缘函数触发规则的 URL,可预览到合并后的视频。查看响应头,视频以 chunked 方式传输。
![](https://qcloudimg.tencent-cloud.cn/image/document/5068c1f17f8c0b1c580ea6dccdc66c48.png)