I am new to Mac and I use a standard video camera to grab images under high magnification. I purchased the elgato video capture device to plug my video cable into that I can run to display on TV monitor. I would like to be able to see what I am looking at on my mac instead of the TV but have the ability to capture still images from what I am observing without recording a whole video than going back and looking at it in quicktime and edit/copy the images I want. I would like to just grab the image while streaming live? I did have the ability to do this with PC using a USB VIDBOX and VLC viewer but dont know how my tech set that up? I downloaded VLC but cant seem to get this to work. Any help would be appreciated?