C#

Hi. I'm in need of recording video from a 4 channel DVR from .net C#. I've looked at EMGU a Opencv .net wrapper as well as the DirectShow .net library to do this. I've decided to give EMGU a go and is quite happy with it when using webcams. Now I want to use a 4 channel H.264 Usb DVR for the same purpose, but I don't know how to select a video channel on the DVR. When running the sample capture application of EMGU I only get a black screen. I have the same problem with DirectShow. It picks up the DVR as a DR 3101_3104 Video Capture device, but is also showing me the black screen.
Note that the camera is working fine, when I use "SuperDVR"(software that came included with the DVR).

I think there must be a way to specify the channel of which camera you want in both of these libraries, but I have no idea. Could someone shed some light on my problem please.

string sourceFile, destinationFile;

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       private void ConvertFiles(string src, string dest)
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