Are you getting video on you screen/monitor?
What are the specs of the computer your trying to capture to? CPU, memory, motherboard model number, video card model number, operating system? Or a model number, if it’s a brand name PC.
Have you tried capturing directly to the LGP2, without it being connected to the computer?
What is the OSSC showing on its LCD screen?
To be certain, this is the avermedia external capture device you have? https://www.avermedia.com/gaming/product/game_capture/live_gamer_portable_2