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1.首先创建ConsoleApp，.Net 9.0，不要创建WinForm 。WInForm帧率和实际对不上，有延时。

2.下载opencvsharp。

3.下载openh264-1.8.0-win32.dll  ,  openh264-1.8.0-win64.dll .放在根目录。

https://github.com/cisco/openh264

using OpenCvSharp;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;namespace ConsoleApp1
{internal class Program{private const int CameraIndex = 0;private const double Fps = 30.0;// private static readonly OpenCvSharp.Size FrameSize = new OpenCvSharp.Size(1280, 720);private static readonly OpenCvSharp.Size FrameSize = new OpenCvSharp.Size(640, 480);private const int ReconnectInterval = 3000; // 重试间隔(ms)private const int MaxReconnectAttempts = 5; // 最大重试次数static void Main(string[] args){int reconnectAttempts = 0;bool isRecording = true;while (isRecording && reconnectAttempts < MaxReconnectAttempts){try{using (var capture = new VideoCapture(CameraIndex))using (var writer = new VideoWriter()){if (!InitializeCamera(capture)){reconnectAttempts++;Thread.Sleep(ReconnectInterval);continue;}string OutputFile = System.DateTime.Now.ToString("yyyy-MM-dd_HH-mm-ss") + "_output.avi";if (!InitializeVideoWriter(writer, OutputFile, Fps, FrameSize)){Console.WriteLine("无法初始化视频写入器!");return;}Console.WriteLine("开始录制，按ESC键停止...");reconnectAttempts = 0; // 重置重试计数器using (var window = new Window("摄像头画面"))using (var frame = new Mat()){while (true){// 检查摄像头是否仍然连接if (!capture.IsOpened()){Console.WriteLine("检测到摄像头断开连接!");break;}// 捕获帧capture.Read(frame);DateTime now = DateTime.Now;Cv2.PutText(frame, now.ToString("yyyy-MM-dd HH:mm:ss"), new Point(10, 30),HersheyFonts.HersheySimplex, 0.6, Scalar.White, 1);if (frame.Empty()){Console.WriteLine("接收到空帧，可能摄像头已断开!");break;}// 显示帧window.ShowImage(frame);// 写入帧到文件writer.Write(frame);// 按ESC键退出if (Cv2.WaitKey(10) == 27){isRecording = false;break;}}}}}catch (Exception ex){Console.WriteLine($"发生错误: {ex.Message}");}if (isRecording && reconnectAttempts < MaxReconnectAttempts){Console.WriteLine($"尝试重新连接({reconnectAttempts + 1}/{MaxReconnectAttempts})...");reconnectAttempts++;Thread.Sleep(ReconnectInterval);}}if (reconnectAttempts >= MaxReconnectAttempts){Console.WriteLine($"已达到最大重试次数({MaxReconnectAttempts})，停止尝试。");}Console.WriteLine("程序结束");}static bool InitializeCamera(VideoCapture capture){if (!capture.IsOpened()){Console.WriteLine("无法打开摄像头!");return false;}// 设置摄像头参数capture.Set(VideoCaptureProperties.FrameWidth, FrameSize.Width);capture.Set(VideoCaptureProperties.FrameHeight, FrameSize.Height);capture.Set(VideoCaptureProperties.Fps, Fps);// 验证实际设置的值double actualWidth = capture.Get(VideoCaptureProperties.FrameWidth);double actualHeight = capture.Get(VideoCaptureProperties.FrameHeight);Console.WriteLine($"摄像头分辨率: {actualWidth}x{actualHeight}");return true;}static bool InitializeVideoWriter(VideoWriter writer, string filename, double fps, Size frameSize){// 尝试几种常见的编码格式Dictionary<string, FourCC> _codecs = new Dictionary<string, FourCC>(){{"X264", FourCC.X264},{"XVID", FourCC.XVID},{"MJPG", FourCC.MJPG},{"H264", FourCC.H264},{"MP4V", FourCC.MP4V},{"DIVX", FourCC.DIVX}};foreach (var codec in _codecs){writer.Open(filename, codec.Value, fps, frameSize, true);if (writer.IsOpened()){Console.WriteLine($"使用编码器: {codec.Key}");return true;}}Console.WriteLine("无法找到合适的视频编码器!");return false;}}
}

4.运行。

整个工程打包下载：

【免费】opencvsharpusb摄像头录像c#H264编码资源-CSDN文库