英文:
Is there a way to serve the video part, providing start end seconds?
问题
我正在尝试使用后端来提供存储中的视频。我使用Go + GIN，它可以工作，但我需要实现带有开始和结束参数的视频请求。例如，我有一个持续10分钟的视频，我想请求从2分钟到3分钟的片段。这是否可能？是否有示例可供参考？
以下是您目前的代码：
accessKeyID := ""
secretAccessKey := ""
useSSL := false
ctx := context.Background()
endpoint := "127.0.0.1:9000"
bucketName := "mybucket"
// 初始化 minio 客户端对象
minioClient, err := minio.New(endpoint, &minio.Options{
Creds: credentials.NewStaticV4(accessKeyID, secretAccessKey, ""),
Secure: useSSL,
})
if err != nil {
log.Fatalln(err)
}
// 获取文件
object, err := minioClient.GetObject(ctx, bucketName, "1.mp4", minio.GetObjectOptions{})
if err != nil {
fmt.Println(err)
return
}
objInfo, err := object.Stat()
if err != nil {
return
}
buffer := make([]byte, objInfo.Size)
object.Read(buffer)
c.Writer.Header().Set("Content-Length", fmt.Sprintf("%d", objInfo.Size))
c.Writer.Header().Set("Content-Type", "video/mp4")
c.Writer.Header().Set("Connection", "keep-alive")
c.Writer.Header().Set("Content-Range", fmt.Sprintf("bytes 0-%d/%d", objInfo.Size, objInfo.Size))
//c.Writer.Write(buffer)
c.DataFromReader(200, objInfo.Size, "video/mp4", bytes.NewReader(buffer), nil)
希望对您有所帮助！
英文:
I am trying to use the backend to serve the video from the storage. I use Go + GIN It works but I need to implement video requests with start and end parameters. For example, I have a video with 10 mins duration and I want to request a fragment from 2 to 3 mins. Is it possible or are there examples somewhere?
This is what I have now:
accessKeyID := ""
secretAccessKey := ""
useSSL := false
ctx := context.Background()
endpoint := "127.0.0.1:9000"
bucketName := "mybucket"
// Initialize minio client object.
minioClient, err := minio.New(endpoint, &minio.Options{
Creds: credentials.NewStaticV4(accessKeyID, secretAccessKey, ""),
Secure: useSSL,
})
if err != nil {
log.Fatalln(err)
}
// Get file
object, err := minioClient.GetObject(ctx, bucketName, "1.mp4", minio.GetObjectOptions{})
if err != nil {
fmt.Println(err)
return
}
objInfo, err := object.Stat()
if err != nil {
return
}
buffer := make([]byte, objInfo.Size)
object.Read(buffer)
c.Writer.Header().Set("Content-Length", fmt.Sprintf("%d", objInfo.Size))
c.Writer.Header().Set("Content-Type", "video/mp4")
c.Writer.Header().Set("Connection", "keep-alive")
c.Writer.Header().Set("Content-Range", fmt.Sprintf("bytes 0-%d/%d", objInfo.Size, objInfo.Size))
//c.Writer.Write(buffer)
c.DataFromReader(200, objInfo.Size, "video/mp4", bytes.NewReader(buffer), nil)
答案1
得分: 2
这将需要你的程序至少对媒体流进行解复用，以获取其中的时间信息，以防你使用的容器支持该功能；或者在不支持的情况下，实际解码视频流。一般来说，你无法知道需要在视频文件中寻找多少字节才能到达特定位置。
由于输出需要是一个有效的媒体容器，以便请求者能够处理它，所以需要将其重新混合到输出容器中。
因此，选择一个能够完成这些操作的库，并阅读其文档。Ffmpeg / avlib 是经典选择，但我不知道是否已经有其他人为其编写了go绑定。如果没有，编写绑定可能是值得的。
注：在某些情况下，你可能可以知道需要寻找多少字节，这可能适用于具有固定复用比特率的MPEG传输流。但除非你从事实际的电视塔或电视卫星的视频流媒体工作，需要一个恒定速率的数据流，否则你可能不会处理这些情况。
英文:
This will require your program to at least demux the media stream to get time information out of it, in case you're using a container that supports that, or to actually decode the video stream in case it doesn't - in general, you can't know how many bytes you need to seek into a video file to go to a specific location¹.
As the output again needs to be a valid media container so that whoever requested it can deal with it, there's going to be remixing into an output container.
So, pick yourself a library that can do that and read its documentation. Ffmpeg / avlib is the classical choice there, but I have positively no idea about whether someone else has already written go bindings for it. If not, doing that works be worthwhile.
¹ there is cases where you can, that would probably apply to MPEG Transport Streams with a fixed mux bitrate. But unless you're working in streaming of video for actual TV towers or actual TV satellites that need a constant rate data stream, you will not likely be dealing with these
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