打开视频的思路跟打开图片的思路是一样的，只不过视频是由一帧帧图片组成，因此，打开视频的处理程序有一个连续的获取图片并逐帧显示的处理过程。GUI同《浅入浅出EmguCv（二）EmguCv打开指定图片》一样，只不过处理程序编程如下所示：
/// <summary>
/// 点击按钮打开指定图片
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OpenImage_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDialog = new OpenFileDialog();
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
try
{
capture = new Capture(openFileDialog.FileName);
fps = (int)capture.GetCaptureProperty(CapProp.Fps);
Application.Idle += new EventHandler(ProcessFrame);
}
catch (Exception exp)
{
MessageBox.Show(exp.Message);
} }
}
private void ProcessFrame(object sender, EventArgs e)
{ Mat frame = capture.QueryFrame();
if (frame != null)
{
//为使播放顺畅，添加以下延时
System.Threading.Thread.Sleep((int)(1000.0 /fps-));
picWindow.Image = frame; }
GC.Collect();
}
编译运行，打开视频如图所示：