Capture Frame Not Video AForge C＃ASP.NET

Question

我有以下代码，它可以捕获视频并非常快速地更新jpg。

我需要将其更改为每x秒捕获一帧，以便我可以对它做其他事情，例如解码条形码：

using AForge.Video;
using AForge.Video.DirectShow;

namespace BAMSystem
{
public partial class WebForm1 : System.Web.UI.Page
{
    public int FrameRate { get; set; }

    private FilterInfoCollection VideoCaptureDevices;
    private VideoCaptureDevice FinalVideo;

    protected void Page_Load(object sender, EventArgs e)
    {
        inputDevices.Items.Clear();

        VideoCaptureDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
        foreach (FilterInfo VideoCaptureDevice in VideoCaptureDevices)
        {
            inputDevices.Items.Add(VideoCaptureDevice.Name);
        }
        inputDevices.SelectedIndex = 0;

        FinalVideo = new VideoCaptureDevice(VideoCaptureDevices[inputDevices.SelectedIndex].MonikerString);
        FinalVideo.NewFrame += new NewFrameEventHandler(FinalVideo_NewFrame);

    }

    public void Start_OnClick(object sender, EventArgs e)
    {
                FinalVideo.Start();
    }

    void FinalVideo_NewFrame(object sender, NewFrameEventArgs eventArgs)
    {
                Bitmap video = (Bitmap)eventArgs.Frame.Clone();
                video.Save("C:\\Users\\Wayneio\\Desktop\\image\\live.jpg");
    }
    public void Stop_OnClick(object sender, EventArgs e)
    {
        if (FinalVideo.IsRunning)
        {
            FinalVideo.SignalToStop();
            FinalVideo.Stop();
        }
    }

Answer 1

首先将videoCaptureDevice.desiredFrameRate设置为1。这应使NewFrameEventHandler每秒运行一次。然后让num之后的NewFrameEventHandler做一些事情。所需的秒数（跳过或帧）。

Answer 2

如果您的相机不支持设置帧频。您可以使用全局变量，并且仅在该值= true时才执行，这可以通过Visual Studio中的简单计时器事件来执行。

void FinalVideo_NewFrame(object sender, NewFrameEventArgs eventArgs)
   { if(mytimedevent) {
                    Bitmap video = (Bitmap)eventArgs.Frame.Clone();
                    video.Save("C:\\Users\\Wayneio\\Desktop\\image\\live.jpg");
                    }
     mytimedevent!=mytimedevent  // or set it simply to false.
    }

您还可以根据其他计算来更改mytimedevent的值：如果完成，请将其启用为true，并在运行时将其设置为false。