英文:
GoLang - Seeking through a video (serving as bytes)
问题
我正在使用golang编写一个服务器，并成功实现了基本的.mp4文件服务。它通过字节流进行传输。问题是我无法在视频中进行定位/跳转。我尝试在Stack Overflow和Google上搜索答案，但没有找到解决方法。
以下是我的代码：
package mainimport ("net/http""io/ioutil""fmt""os""log""bytes")func ServeHTTP(w http.ResponseWriter, r *http.Request) {// 读取生成的receipt.pdf文件并将其流式传输到浏览器streamPDFbytes, err := ioutil.ReadFile("./video.mp4")log.Println(r)if err != nil {fmt.Println(err)os.Exit(1)}b := bytes.NewBuffer(streamPDFbytes)// 直接流式传输到客户端（浏览器）w.Header().Set("Content-type", "video/mp4")if _, err := b.WriteTo(w); err != nil { // <----- 这里！fmt.Fprintf(w, "%s", err)}w.Write([]byte("Video Completed"))}func main() {http.Handle("/", new(MyHandler))http.ListenAndServe(":8080", nil)}
有人知道如何在golang中实现定位吗？
谢谢，祝您有愉快的一天！
英文:
I'm writing a server in golang and I got it to serve a basic .mp4 file. It serves it by bytes. The problem is that I can not seek/skip through the video. I've tried searching throughout stackover flow and google to find an answer but I came up short..
Here is my code:
package mainimport ("net/http""io/ioutil""fmt""os""log""bytes")func ServeHTTP(w http.ResponseWriter, r *http.Request) {// grab the generated receipt.pdf file and stream it to browserstreamPDFbytes, err := ioutil.ReadFile("./video.mp4")log.Println(r)if err != nil {fmt.Println(err)os.Exit(1)}b := bytes.NewBuffer(streamPDFbytes)// stream straight to client(browser)w.Header().Set("Content-type", "video/mp4")if _, err := b.WriteTo(w); err != nil { // <----- here!fmt.Fprintf(w, "%s", err)}w.Write([]byte("Video Completed"))}func main() {http.Handle("/", new(MyHandler))http.ListenAndServe(":8080", nil)}
Does anyone have the answer to how seeking works in golang?
Thanks,
Have a great day!
答案1
得分: 5
在Go语言中，实现支持定位的最简单的流式传输MP4视频的方法如下：
package mainimport ("net/http")func main() {fs := http.FileServer(http.Dir("."))http.Handle("/", http.StripPrefix("/", fs))http.ListenAndServe(":8080", nil)}
视频将在 http://localhost:8080/video.mp4 上可用。
更复杂的方法如下：
package mainimport ("log""net/http""os""time")func ServeHTTP(w http.ResponseWriter, r *http.Request) {video, err := os.Open("./video.mp4")if err != nil {log.Fatal(err)}defer video.Close()http.ServeContent(w, r, "video.mp4", time.Now(), video)}func main() {http.HandleFunc("/", ServeHTTP)http.ListenAndServe(":8080", nil)}
如果你需要更灵活的方法，你可以实现自己的渐进式流式传输服务器。
在你的代码中，你忘记添加和处理 Range/Accept-Range 头部，这就是为什么 FF 和 Chrome 都没有显示进度条。但是，我认为将整个MP4文件保存在内存中并不是一个好主意。
英文:
The simplest way to stream MP4 video on Go with seeking support is
package mainimport ("net/http")func main() {fs := http.FileServer(http.Dir("."))http.Handle("/", http.StripPrefix("/", fs))http.ListenAndServe(":8080", nil)}
And video will be available at http://localhost:8080/video.mp4
More complex is
package mainimport ("log""net/http""os""time")func ServeHTTP(w http.ResponseWriter, r *http.Request) {video, err := os.Open("./video.mp4")if err != nil {log.Fatal(err)}defer video.Close()http.ServeContent(w, r, "video.mp4", time.Now(), video)}func main() {http.HandleFunc("/", ServeHTTP)http.ListenAndServe(":8080", nil)}
If you need something more flexible you should implement your own progressive streaming server.
In your code you forgot to add and process Range/Accept-Range headers that's why nor FF, nor Chrome doesn't show you seek bar but anyway I don't think that keeping whole MP4 file in memory is good idea.
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