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C#利用OpenCvSharp库可以轻松实现摄像头录像功能

在C#中，利用OpenCvSharp库可以轻松实现摄像头录像功能。以下是具体实现步骤和代码示例。

步骤 1：安装OpenCvSharp库

通过NuGet安装以下包：

注意：.NET4.8环境需要安装包：OpenCvSharp4和OpenCvSharp4.runtime.win的版本为4.5

Install-Package OpenCvSharp4
Install-Package OpenCvSharp4.runtime.win

步骤 2：实现录像功能

以下代码展示了如何使用VideoCapture和VideoWriter进行录像：

using OpenCvSharp;
using System;
using System.Threading;
class VideoRecorder
{
   private VideoCapture videoCapture;
   private VideoWriter videoWriter;
   private bool isRecording = false;
   public void StartRecording()
   {
       // 初始化摄像头
       videoCapture = new VideoCapture(0);
       if (!videoCapture.IsOpened())
       {
           Console.WriteLine("无法打开摄像头！");
           return;
       }
       // 设置视频参数
       int frameWidth = (int)videoCapture.FrameWidth;
       int frameHeight = (int)videoCapture.FrameHeight;
       double fps = 30.0;
       // 设置输出文件路径和格式
       string outputFilePath = $"output_{DateTime.Now:yyyyMMddHHmmss}.avi";
       videoWriter = new VideoWriter(outputFilePath, FourCC.XVID, fps, new Size(frameWidth, frameHeight), true);
       isRecording = true;
       // 开始录制线程
       Thread recordingThread = new Thread(() =>
       {
           Mat frame = new Mat();
           while (isRecording)
           {
               videoCapture.Read(frame);
               if (frame.Empty()) break;
               // 写入视频文件
               videoWriter.Write(frame);
               // 显示当前帧
               Cv2.ImShow("Recording", frame);
               if (Cv2.WaitKey(1) == 27) break; // 按ESC键退出
           }
           StopRecording();
       });
       recordingThread.Start();
   }
   public void StopRecording()
   {
       isRecording = false;
       videoWriter?.Release();
       videoCapture?.Release();
       Cv2.DestroyAllWindows();
   }
}
class Program
{
   static void Main(string[] args)
   {
       VideoRecorder recorder = new VideoRecorder();
       Console.WriteLine("按Enter键开始录制...");
       Console.ReadLine();
       recorder.StartRecording();
       Console.WriteLine("按Enter键停止录制...");
       Console.ReadLine();
       recorder.StopRecording();
   }
}

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