Techniques for video screen rotation using Golang and FFmpeg

Techniques for video screen rotation using Golang and FFmpeg

In modern society, videos have become an indispensable part of people's daily lives. However, in some cases, we may need to perform some processing on the video, such as rotating the video screen. This article will use Golang and FFmpeg to realize the rotation of video images and provide specific code examples.

First, we need to ensure that FFmpeg is installed in the system. If you have not installed FFmpeg, you can install it through the official website (https://ffmpeg.org/) or other ways.

Next, we use Golang to write code and first install the relevant dependency packages. Execute the following command in the command line:

go get github.com/h2non/imaginary/ffmpeg
go get github.com/h2non/imaginary/ffmpeg/builder

Then, create a file called rotate.go and add the following code:

package main

import (
    "log"
    "os"
    "os/exec"
)

func main() {
    // 指定输入视频文件路径
    inputPath := "input.mp4"
    // 指定输出视频文件路径
    outputPath := "output.mp4"
    // 指定旋转角度（逆时针）
    rotateDegree := "90"

    // 构建FFmpeg命令
    cmd := exec.Command("ffmpeg", "-i", inputPath, "-vf", "transpose="+rotateDegree, outputPath)

    // 执行命令
    err := cmd.Run()
    if err != nil {
        log.Fatal(err)
    }

    log.Println("视频旋转完成")
}

In the code, we can see that first the The path to the input video file and the path to the output video file. Then, we use FFmpeg's -vf option to rotate the video screen, where the transpose option is used to specify the angle of rotation. Here we set it to "90" to rotate the video 90 degrees clockwise.

Finally, we execute the FFmpeg command by running cmd.Run(). If the execution is successful, we will see the log output "Video rotation completed".

Next, we can place the video file that needs to be rotated in the same directory as rotate.go, and change the video file name to "input.mp4". Then, execute the following command on the command line to run the program:

go run rotate.go

The program will read the "input.mp4" file, process it according to the specified rotation angle, and finally generate the "output.mp4" file.

Through the above steps, we successfully used Golang and FFmpeg to rotate the video screen. Of course, we can also configure more parameters according to specific needs, such as adjusting the resolution and frame rate of the video, etc.

To sum up, Golang and FFmpeg are very powerful tools that can help us perform various processing of videos. Through the introduction and sample code of this article, I believe readers can use them more flexibly and achieve more interesting video processing functions.

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