树莓派简单摄像头录像并保存视频文件

一、简介

　　本文讲使用OpenCV，不使用FFMPEG的方法进行保存视频。

二、代码

　　1、引用

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="OpenCvSharp3-AnyCPU" version="3.4.1.20180830" targetFramework="net47" />
</packages>

　　2、代码

using OpenCvSharp;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace OpenCVDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            var cameraIndex = 0;
            if (args != null && args.Length > 0)
            {
                int.TryParse(args[0], out cameraIndex);
            }
            Console.WriteLine("Begin At Cam Index " + cameraIndex + " ...");
            var path = Path.Combine(AppContext.BaseDirectory, "imgs");
            if (!Directory.Exists(path))
                Directory.CreateDirectory(path);
            int count = 0;
            var videoSize = new Size(640, 480);
            var timePoint = new Point(0, 15);
            VideoWriter videoWriter = new VideoWriter(Path.Combine(path, "Video.mp4"), FourCC.XVID, 30,
                   videoSize, true);
            using (var camera = VideoCapture.FromCamera(CaptureDevice.Any))
            {
                //VideoWriter videoWriter = new VideoWriter(Path.Combine(path, "Video.mp4"), FourCC.Prompt, 30,
                //new Size(camera.Get(CaptureProperty.FrameWidth), camera.Get(CaptureProperty.FrameHeight)));
                while (true)
                {
                    var mat = camera.RetrieveMat();
                    if (mat.Empty()) { Thread.Sleep(100); continue; }
                    if (++count > 30 * 30) break;
                    Console.WriteLine("save .. " + count);
                    //mat.PutText(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), new Point(10, 10), HersheyFonts.HersheyPlain, 20, Scalar.Yellow, 2);
                    Cv2.PutText(mat, DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + " GTM+8", timePoint, HersheyFonts.HersheyPlain, 1, Scalar.Red, 1);
                    //OpenCvSharp.Cv2.ImShow("myWin", mat);
                    //if (Cv2.WaitKey(40) == 13)
                    //{
                    //    break;
                    //}
                    Thread.Sleep(50);
                    var newmat = mat.Resize(videoSize);
                    videoWriter.Write(newmat);
                    mat.Dispose();
                    newmat.Dispose();
                }
                videoWriter.Dispose();
                //GC.Collect();
            }
            Console.WriteLine("Finish.");
        }
    }
}