Practice of video splicing using Golang and FFmpeg

The practice of using Golang and FFmpeg to implement video splicing

Introduction:
In daily life, we often encounter the need to merge multiple video files into A situation, such as splicing multiple recorded videos into a complete video file. To achieve this goal, this article will introduce how to use Golang and FFmpeg libraries to implement the video splicing process, and provide specific code examples.

1. What are Golang and FFmpeg?
Golang (Go language) is an open source programming language developed by Google. It has the characteristics of simplicity, efficiency, and strong concurrency, and is widely used to build reliable and high-performance software applications.

FFmpeg is a cross-platform open source multimedia framework for processing video, audio and other multimedia data. It provides a set of powerful libraries and command line tools that can be used for decoding, encoding, and transcoding of media data, as well as audio and video editing, merging, and other operations.

2. Environment preparation
To implement the video splicing process, we first need to install Golang and FFmpeg and ensure that they can run normally.

1. Installing Golang: You can download the appropriate binary installation package from the Golang official website [https://golang.org/dl/] and install it according to the official documentation.
2. Installing FFmpeg: You can download the appropriate binary installation package from the FFmpeg official website [https://ffmpeg.org/download.html] and install it according to the official documentation.
3. Install Golang's FFmpeg binding library: Golang provides a FFmpeg binding library, which can be installed through the following command:
   $ go get github.com/mindworker/ffwrap

3. Video splicing steps
Below we will introduce the specific video splicing steps and provide corresponding code examples.

1. Import required libraries:
   In the Golang code, we need to import some required libraries:

   import (
    "fmt"
    "os"
    "os/exec"
   )

2. Define video Splicing function:
   In the code, we can define a function named concatVideos to implement video splicing:

   func concatVideos(output string, videos []string) error {
    cmd := exec.Command("ffmpeg")
    args := []string{"-y", "-f", "concat", "-safe", "0", "-i", "list.txt", "-c", "copy", output}
   
    file, err := os.Create("list.txt")
    defer file.Close()
   
    if err != nil {
        return err
    }
   
    for _, video := range videos {
        _, err := file.WriteString(fmt.Sprintf("file '%s'
   ", video))
        if err != nil {
            return err
        }
    }
   
    err = cmd.Run()
    if err != nil {
        return err
    }
   
    return nil
   }

3. Call the video splicing function:
   In the code, we can call the defined concatVideos function and pass in the corresponding parameters to perform video splicing:

   func main() {
    videos := []string{"input1.mp4", "input2.mp4", "input3.mp4"}
    output := "output.mp4"
   
    err := concatVideos(output, videos)
    if err != nil {
        fmt.Printf("Error: %s", err.Error())
        return
    }
   
    fmt.Println("Video concatenation completed successfully!")
   }

4. Code Description
In our code example, we use FFmpeg's concat protocol, which can splice multiple videos into a complete video. The specific steps are as follows:

1. In the concatVideos function, we first create a ffmpeg command and set the corresponding parameters.
2. Next, we create a list.txt file and write the video file names to be spliced ​​into the file in a certain format.
3. Finally, we execute the command and wait for the merge to complete.

It should be noted that we used the copy option of ffmpeg when merging videos, which can directly copy the video stream to the target file. Without any re-encoding, the quality and encoding of the original video are retained.

5. Summary
This article introduces the practice of using Golang and FFmpeg to implement video splicing, and provides specific code examples. By using Golang and FFmpeg, we can easily splice multiple video files into a complete video file to meet various practical needs. Hope this article can be helpful to you!

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