"What is the best way to bring an analogue signal in?"

There is a large variety of hardware options to import an analogue signal into Wirecast. On the Windows side, if you wish to import a S-Video signal, you will be able to find a number of USB and PCI card solutions. If you are looking to go the USB route, we recommend choosing a USB-2 device (assuming your computer is also USB-2 capable) because of the improved bandwidth supported, yielding higher quality video. Analogue to DV Firewire converters are supported on both Mac OS X and Windows.