Virtualdub keyframe picture doesn't match the actual video

[yuvid]

Hi Guys! I have a problem on editing video clips using Virtualdub. When I try to cut out the ending, I usually just drag close to it, then seek to keyframe to cut. The problem is that the picture on the built-in player doesn't match the actual video. Let's say there is a blank video at the end. Using Next Keyframe to find keyframe, the player will show the black screen, but actually it's still on the scene. Is that normal? or I have messed something up? Using latest Virtualdub64 on W7 64bit, and ffdshow.

[manono]

If the video has B-Frames you won't see the correct frame. I just play the video in a player (MPC-HC in my case), pause it where I want to cut, and then use the keyframe closest to that time.