Any capture device has to support converting into the Quicktime formats. I have tried a few, but they didn't have the proper conversion. Ones that I know will work are the Canopus boxes. They have different versions. The ADVC110 seems to be a very standard one for capturing composite video. You can even buy them at apple stores. I have used that with great results. However, You can only use one per machine as it can only accept one incoming video stream.