You need 2 computers, because You need always to use capture software if You want to capture videos and audios via EasyCap. It is possible if You have video out in Your another computer - just put between Computer and EasyCap RCA cable. Audio is possible to take also from audio card to EasyCap if You have suitable adapter from audio out (audio card) to 2xRCA in female RCA connectors in EasyCap. Then only EasyCap to USB port and start capture software.
But why You do not install some screen capture software in Your comp and capture all in one computer without any EasyCap. If You use microphone You can take also audio with that video.
More information, drivers and sample vids from my Youtube channel:
http://www.youtube.com/user/EasycapExperttihttp://easycapexpertti.mybisi.com/