golang build video

Golang Building Video: From Getting Started to Practical Combat

With the rapid development of the Internet and information technology, video plays an increasingly important role in our daily lives. Against this background, the demand for video platforms and applications is also increasing. Golang is a rapidly rising language, and its advantages of high efficiency, powerful concurrency capabilities and easy-to-learn syntax are recognized by more and more developers. In this article, we will introduce how to use Golang to build a simple video application, and provide examples and code of the actual application.

1. Environment setup

Before starting any Golang project, you need to install Golang. In this example, we will use Golang version 1.16. You can download the installation package from the official website and follow the installation wizard to install it, or use the default package manager of your Linux distribution to install it.

After the installation is complete, you will also need to install some tools and dependencies to develop our video application. Here are the necessary tools and dependencies:

1. FFmpeg: This is a command line application for processing and transcoding videos.
2. GStreamer: This is a streaming framework that we will use to process audio.

After installing these tools, you need to use the following commands in the terminal to check:

go version
ffmpeg -version
gst-launch-1.0 --version

These commands will display the version information of Golang, FFmpeg and GStreamer respectively.

2. Overview

In the remainder of this article, we will use Golang and FFmpeg to build a very basic video application. We will use GStreamer to process audio streams and incorporate them into our application. In this example, we will write a simple web server that can be used to process and convert video files uploaded by users.

We will use Golang's official web framework - Go Gin to build this web server. Next, we'll detail how to build this application.

3. Write the code

First, we will import the required dependencies. This includes Go Gin and FFmpeg, which can be installed with the following command:

go get -u github.com/gin-gonic/gin
go get -u github.com/gabriel-vasile/mimetype
go get -u github.com/jinzhu/gorm
go get -u github.com/jinzhu/gorm/dialects/sqlite

Next, we will import the required packages and create a file called "main.go". The file should contain the following code:

package main

import (
    "github.com/gin-gonic/gin"
)

func main() {
    router := gin.Default()

    router.POST("/upload", upload)
    router.Run(":8080")
}

func upload(c *gin.Context) {
    file, header, err := c.Request.FormFile("file")
    if err != nil {
        c.String(400, "Bad Request")
        return
    }

    defer file.Close()

    // Save the file to disk
    fileName := header.Filename
    out, err := os.Create("/tmp/" + fileName)
    if err != nil {
        c.String(500, "Internal Server Error")
        return
    }
    defer out.Close()

    _, err = io.Copy(out, file)
    if err != nil {
        c.String(500, "Internal Server Error")
        return
    }

    c.String(200, "File uploaded successfully")

}

This code creates a Go Gin server that contains a POST endpoint. The POST/upload endpoint will allow users to upload video files.

In the upload handler, we obtain the uploaded file through c.Request.FormFile("file"), and then save it to a temporary directory on the disk. After saving the file, we send a successful upload message to the client.

Next, we need to write code to process the uploaded video and convert it to the appropriate format using FFmpeg. We can install FFmpeg by using the following command:

sudo apt-get install ffmpeg

Next, add the following code to our application:

func upload(c *gin.Context) {
    file, header, err := c.Request.FormFile("file")
    if err != nil {
        c.String(400, "Bad Request")
        return
    }

    defer file.Close()

    // Save the file to disk
    fileName := header.Filename
    out, err := os.Create("/tmp/" + fileName)
    if err != nil {
        c.String(500, "Internal Server Error")
        return
    }
    defer out.Close()

    _, err = io.Copy(out, file)
    if err != nil {
        c.String(500, "Internal Server Error")
        return
    }

    // Get file information
    f, err := os.Open("/tmp/" + fileName)
    if err != nil {
        c.String(500, "Internal Server Error")
        return
    }

    fileInfo, err := f.Stat()
    if err != nil {
        c.String(500, "Internal Server Error")
        return
    }

    mimeType, err := mimetype.DetectFile("/tmp/" + fileName)
    if err != nil {
        c.String(500, "Internal Server Error")
        return
    }

    // Convert the video to MP4
    if mimeType.String() != "video/mp4" {
        cmd := exec.Command("ffmpeg", "-i", "/tmp/"+fileName, "-c:v", "libx264", "-c:a", "aac", "-strict", "experimental", "-preset", "slow", "-crf", "22", "-movflags", "faststart", "/tmp/"+fileName+".mp4")

        err = cmd.Run()
        if err != nil {
            c.String(500, "Internal Server Error")
            return
        }

        // Remove the original file
        err = os.Remove("/tmp/" + fileName)
        if err != nil {
            c.String(500, "Internal Server Error")
            return
        }

        fileName = fileName + ".mp4"
    }

    // Serve the video
    c.FileAttachment("/tmp/"+fileName, fileName)

}

In this version of the upload handler, we use FFmpeg to Uploaded videos are converted to MP4 format. We use the mimetype package to detect the MIME type of the uploaded file, and if it's not "video/mp4" we run the FFmpeg conversion command.

4. Test the application

Now that our application is finished writing, we can run the server on localhost using the following command:

go run main.go

Once the server is running, You can test it using curl or your favorite HTTP client. Here is an example command to test an uploaded video with curl:

curl -F "file=@/path/to/video/file" http://localhost:8080/upload
````

这将向localhost：8080的“upload”端点POST一个视频文件。如果一切正常，您应该会收到一条来自服务器的附加文件的相应消息，该消息将向您提供已处理的视频的URL。

五、总结

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