DirectShow Sample Grabber filter

[sunnyday28]

After I added the Sample Grabber filter between the demux and Render, the video part will "freeze", but the audio works well. Do you know why?
Is there any sample?

[Baldrick]

What are you doing? Graphedit? or what?

[sunnyday28]

After insert SampleGrabber filter between video decoder and video render, it only can display first frame. How to keep deliver incomming data from decoder filter to renderer filter?

I would like to use the grabber to compare the video and audio after decoder and the input, in order to check the quality by programme instead of naked eyes. I have finished the compare part, the rest of the problem is cannot the image buffer and at the same time keep playing.