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 main
import (
"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 main
import (
"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 browser
streamPDFbytes, 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 main
import (
"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 main
import (
"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 main
import (
"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 main
import (
"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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