Hmmmm, I'm not familiar with using the capture cards but LeadTek's website had this to say: Do you remember setting it to use one of those formats? If you don't you can load it into GSpot to determine what format it's in: http://www.afterdawn.com/software/video_software/video_tools/gspot.cfm
an1990 Nephilim is right, we need to know what format you captured your video in before we can give you an answer.