Add the ISampleGrabberCB to the main class of your app: TForm1 = class(TForm, ISampleGrabberCB) You have to create the following in your main class: Private FSampleGrabber : IBaseFilter m_SampleGrabber: ISampleGrabber function SampleCB(Sa

读取视频中的某一帧图像,用户可以从视频中截取一副图片。-Read a frame of video，user image from the video in the interception，and can get details of the image.