dshow:// duplication

[maitrepiet]

I'm not sure where to post this question, but I'll give it a try here.
I have built a nice application for videorefereeing in fencing.
The application uses VLC to start and stop recording from a HDV camera. As soon as a hit is made, the video is replayed.

This works all nice, BUT ...

Between stopping a first recording and starting a second one, there is at least 1.5 to 2 seconds if I'm using a 1394 HDV camera. If I'm using a HDMI video grabber, it gets even up to 5-10 seconds.
As fencing is a very fast sport, I cannot afford to lose a few seconds of recorded action.

So the solution would be to start the second recording e few seconds before the end of the previous. So I would have 2 recordings where the last seconds of the first are the same as the first of the second.
However, somehow it is impossible to to connect 2 recorders to the same dshow hardware.

Can someone help me with this? Is there a way of duplicating the dshow stream and connect it to 2 independent vlc recorder instances?

[VLC_help]

You would need two VLC instances if you have two recording devices you want to use simultaneously.

[maitrepiet]

Well, I have only 1 recording device: the camera through dshow://
The problem is that I cannot have 2 vlc instances recording simultaneously from the same dshow device. At least not for all devices. It does not work for an AVERMedia HDMI frame grabber.