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   源码介绍

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using AForge.Video;
using AForge.Video.DirectShow;
using AForge.Video.FFMPEG;
using System;
using System.Drawing;
using System.Windows.Forms;

namespace CameraCapture
{
    public partial class Form1 : Form
    {
        private FilterInfoCollection filterInfoCollection;
        private VideoCaptureDevice captureDevice;

        //AForge.Video.FFMPEG 提供的视频写入类
        private VideoFileWriter videoFileWriter = new VideoFileWriter();

        private VideoCapabilities[] videoCapabilities;
        private string fileName;
        private Size frameSize;
        private int framRate;

        public Form1()
        {
            InitializeComponent();
            filterInfoCollection = new FilterInfoCollection(FilterCategory.VideoInputDevice);
            foreach (FilterInfo item in filterInfoCollection)
            {
                this.comboBox1.Items.Add(item.Name);
            }
            this.comboBox1.SelectedIndex = 0;
            //先初始化一下 否则在下面判断是否已运行时会报错
            captureDevice = new VideoCaptureDevice();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            GetVideoCapabilities();
            if (this.checkBox1.Checked)
            {
                SaveFileDialog sfd = new SaveFileDialog();
                sfd.AddExtension = true;
                sfd.DefaultExt = ".avi";
                sfd.Filter = "视频文件|*.avi";
                if (sfd.ShowDialog() == DialogResult.OK)
                {
                    fileName = sfd.FileName;
                }

                //文件名 宽度 高度 帧率 编码
                videoFileWriter.Open(fileName, frameSize.Width, frameSize.Height, framRate, VideoCodec.MPEG4);
            }
            if (captureDevice.IsRunning)
                captureDevice.Stop();

            captureDevice.NewFrame  = captureDevice_NewFrame;
            captureDevice.Start();
        }

        private void captureDevice_NewFrame(object sender, NewFrameEventArgs eventArgs)
        {
            this.pictureBox1.Image = (Bitmap)eventArgs.Frame.Clone();
            if (this.checkBox1.Checked)
            {
                videoFileWriter.WriteVideoFrame((Bitmap)eventArgs.Frame);
            }
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            GetVideoCapabilities();
        }

        /// <summary>
        ///获取摄像头分辨率
        /// </summary>
        private void GetVideoCapabilities()
        {
            captureDevice = new VideoCaptureDevice(filterInfoCollection[comboBox1.SelectedIndex].MonikerString);
            try
            {
                videoCapabilities = captureDevice.VideoCapabilities;

                foreach (VideoCapabilities capabilty in videoCapabilities)
                {
                    if (!this.comboBox2.Items.Contains(capabilty.FrameSize))
                    {
                        this.comboBox2.Items.Add(capabilty.FrameSize);
                    }
                }
                if (videoCapabilities.Length == 0)
                {
                    this.comboBox2.Items.Add("Not supported");
                }
                this.comboBox2.SelectedIndex = 0;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
        {
            this.frameSize = captureDevice.VideoCapabilities[comboBox2.SelectedIndex].FrameSize;
            this.framRate = captureDevice.VideoCapabilities[comboBox2.SelectedIndex].FrameRate;
        }

        /// <summary>
        /// 关闭后结束捕获 释放资源
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (captureDevice.IsRunning)
            {
                captureDevice.Stop();
            }
            if (videoFileWriter.IsOpen)
            {
                videoFileWriter.Close();
            }
        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {

        }

        private void label1_Click(object sender, EventArgs e)
        {

        }
    }
}