Remarks that grabbing samples using ISampleGrabber

R1.

The filter does not support video types with top-down orientation (negative biHeight) or with format type FORMAT_VideoInfo2. Also, it rejects any video type where the surface stride does not match the video width. This means that for some video types, the Sample Grabber will not connect to the Video Mixing Renderer (VMR).

R2.

If you simply want to grab a bitmap from a video file, it is easier to use the Media Detector (MediaDet) object. See Grabbing a Poster Frame for details. The Sample Grabber is more flexible, however, because it works with nearly any media type (see ISampleGrabber::SetMediaType for the few exceptions), and offers more control to the application.

R3.

Regardless of what type you set, the Sample Grabber Filter rejects any video types with top-down orientation (negative biHeight), or with a format type of FORMAT_VideoInfo2. In this case, although the SetMediaType method succeeds, the filter will not connect.