I'm trying to capture the camera feed from an EasyCap 4 Channel USB DVR Device that i got recently and i have bought a super Mimi Monochrome/Color Camera and connected it to the DVR Device and managed to correctly setup the device with the driver "SMI Grabber" and installed the software that comes with the Device "SuperViewer" and i have wrote a simple windows form application that contains a PictureBox to priview the camera feed There is an edit in the bottom The Code using System; using using using using using using using using using namespace DirectShowWithCrossbar { public partial class Form1 Form { private CrossbarSource crossbar; private Filters filters; private Capture capture; public Form1 { InitializeComponent; filters = new Filters; capture = new Capture foreach Filter device in { } if > 0 = 0; foreach Filter device in { } if > 0 = 0; foreach Source source in { } if > 0 = 0; ShowPropertPagesInMenuStrip; crossbar = CrossbarSource = true; = pictureBox1; } private void ShowPropertPagesInMenuStrip { foreach PropertyPage pro in { ToolStripMenuItem } } private void button1_Clickobject sender, EventArgs e { } private void Form1_FormClosingobject sender, FormClosingEventArgs e { } private void comboBox3_SelectedIndexChangedobject sender, EventArgs e { = Source } } } and i got a black screen in the picture box ?? and by mistake after closing my application i ran the SuperViewer application that comes with the DVR device and then open my application then my picture box began to show me the feed from the camera, strange!!! and the feed from the original software freezes !! Example and Sources tried with the same result and i have also used OpenCV and Touchless and i got the same result Edit I have been searching and found that i need to get the filter IAMCrossbar i think that is the problem DirectShow USB webcam changing video source and after appling the changes in this link in the Wrapper i still get the same results Thanks for any help in advance Yaser Machavity♦ gold badges91 silver badges100 bronze badges asked Sep 22, 2013 at 1822 5 If your capture device has option, to select one from multiple input interfaces, then yes, you are right about, that you needed to use IAMCrossbar. If you want to stick to Directshow as others have suggested OpenCV, then I would suggest, Try building all capturing related code in a C++/CLI dll, Build all your UI in C. You can take this MP3 Player Sample Project as starting point for your dll. For capturing, AmCap is a detailed example. What I mean is that you need to get the capturing code out of AmCap into above MP3 Player Sample dll, and expose it to your C application. answered Sep 23, 2013 at 2249 UsmanUsman6181 gold badge6 silver badges15 bronze badges 0