Tips for implementing video screen mirroring using Golang and FFmpeg

Techniques of using Golang and FFmpeg to implement video screen mirroring

Introduction:
In modern society, video processing is a very important technology. Whether it is film production, video editing, or video playback in multimedia applications, video images need to be processed. Among them, mirroring video images is a common operation. This article will introduce how to use Golang and FFmpeg to implement video mirroring techniques, and provide code examples.

1. What are Golang and FFmpeg?

1. Golang:
   Golang (Go language) is a programming language developed by Google. It has concise syntax, efficient concurrency performance and good scalability, and is suitable for development High performance applications.
2. FFmpeg:
   FFmpeg is an open source audio and video processing tool, which can be used for various audio and video processing operations such as encoding, decoding, transcoding, and editing. It provides a wealth of command line tools and APIs to make video processing simpler and more efficient.

2. How to use Golang and FFmpeg to implement video screen mirroring?

1. Install Golang and FFmpeg:
   First, we need to install Golang and FFmpeg. For the installation of Golang, please refer to the official documentation. To install FFmpeg, you can download the binary file for the corresponding platform from the official website or install it through the package management tool.

2. Import dependent libraries:
   In Golang, we can use third-party libraries to call FFmpeg's API. Among them, GoFFmpeg is a very popular library that provides a package for FFmpeg. We can use the go get command to install the GoFFmpeg library:

   go get github.com/giorgisio/goav

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3. Implement video screen mirroring:
   First, we need to import the required libraries:

   package main
   
   import (
    "github.com/giorgisio/goav/avcodec"
    "github.com/giorgisio/goav/avformat"
    "github.com/giorgisio/goav/avutil"
   )

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   Then , we can write a function to implement the function of video screen mirroring:

   func main() {
    // 输入文件名和输出文件名
    inputFileName := "input.mp4"
    outputFileName := "output.mp4"
   
    // 打开输入文件
    inputFormatContext := avformat.AvformatAllocContext()
    if avformat.AvformatOpenInput(&inputFormatContext, inputFileName, nil, nil) < 0 {
        log.Fatalf("无法打开输入文件 %s", inputFileName)
    }
   
    // 获取输入流信息
    if avformat.AvformatFindStreamInfo(inputFormatContext, nil) < 0 {
        log.Fatalf("无法获取流信息")
    }
   
    // 初始化输出格式上下文
    outputFormatContext := avformat.AvformatAllocContext()
    outputFormatContext.SetRtpFlags(1)
   
    // 打开输出文件
    if avformat.AvformatAllocOutputContext2(&outputFormatContext, nil, nil, outputFileName) < 0 {
        log.Fatalf("无法打开输出文件 %s", outputFileName)
    }
   
    // 复制流信息到输出格式上下文
    for _, stream := range inputFormatContext.Streams() {
        outputStream := outputFormatContext.NewStream(nil)
        if avcodec.AvCodecParametersCopy(outputStream.CodecPar(), stream.CodecPar()) < 0 {
            log.Fatalf("无法复制流信息")
        }
    }
   
    // 写入输出文件头部
    if avformat.AvformatWriteHeader(outputFormatContext, nil) < 0 {
        log.Fatalf("无法写入文件头部")
    }
   
    // 初始化数据包
    packet := avutil.AvPacketAlloc()
    defer avutil.AvPacketFree(packet)
   
    // 处理每一帧数据
    for {
        if avformat.AvReadFrame(inputFormatContext, packet) < 0 {
            break
        }
   
        // 获取输入流
        inputStream := inputFormatContext.Streams()[packet.StreamIndex()]
   
        // 创建输出流
        outputStream := outputFormatContext.Streams()[packet.StreamIndex()]
   
        // 镜像处理
        frame := avutil.AvFrameAlloc()
        avcodec.AvcodecSendPacket(inputStream.CodecContext(), packet)
        avcodec.AvcodecReceiveFrame(inputStream.CodecContext(), frame)
        avutil.AvFrameMirror(frame)
   
        // 写入输出文件
        frame.SetPts(packet.Pts())
        avcodec.AvcodecSendFrame(outputStream.CodecContext(), frame)
        avcodec.AvcodecReceivePacket(outputStream.CodecContext(), packet)
        packet.SetPts(avutil.AvRescaleQ(packet.Pts(), inputStream.TimeBase(), outputStream.TimeBase()))
        packet.SetDts(avutil.AvRescaleQ(packet.Dts(), inputStream.TimeBase(), outputStream.TimeBase()))
        avformat.AvWriteFrame(outputFormatContext, packet)
   
        // 释放资源
        avutil.AvFrameUnref(frame)
        avutil.AvPacketUnref(packet)
        avutil.AvPacketFree(packet)
    }
   
    // 写入输出文件尾部
    avformat.AvWriteTrailer(outputFormatContext)
   
    // 释放资源
    avformat.AvformatFreeContext(inputFormatContext)
    avformat.AvformatFreeContext(outputFormatContext)
   }

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4. Compile and run the program:
   After completing the code writing, we can use the go build command to compile the code into executable file and then run the executable file.

Conclusion:
This article introduces how to use Golang and FFmpeg to implement video screen mirroring techniques, and provides specific code examples. Through these code examples, we can learn how to use Golang and FFmpeg for video processing, and master the basic methods of video mirroring processing. I hope this article will be helpful to everyone in video processing.

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