How to get the snapshot of the first video frame of MPEG-2 video?

From: kimi (kimi_at_intervideo.com.cn)
Date: 11/09/04 

Date: Tue, 9 Nov 2004 12:45:42 +0800

I use the DirectShow to build a filter graph which can render the many video
types. I wanna to capture the first frame of the video to display it in the
app window.The way I try list following:
1. run the graph, and pause it, get the Video Render Filter and call the
GetCurrentImage method.
2. pause the graph directly(don't play it first), call GetCurrentImage.
3. step the graph 1 frame, and call getcurrentImage.
all ways can be work well when I render the MPEG-1, AVI, WMV, and so on, the
only one they cannot work well on is MPEG-2 video. When I use the any way of
above to get the frame, the method return S_OK, but the Image is black
screen!(I am sure it should not be a black screen)

Do you have any good way to get the Image? I have tried the IMediaDet, it's
still cannot solve the problem.

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