Hi folks,
Beginner here with a beginner question! Very grateful if anyone can advise.
I have been using a Megadrive through the OSSC (Scart cable) and works wonderfully, no problems.
I’m now trying to connect my Gamecube. I have the standard AVI component cable with the GC (outputs to red, white, yellow)
I’ve tried plugging the AVI component into a scart adapter (just a straight adapter), then plugging the scart into the OSSC (pictured AV1). The sound gets through but no visuals.
Am I correct in assuming that I need a composite or RGB cable ‘out’ from the Gamecube to use with the OSSC? I’ve copied in images below from the user manual for reference.

Many thanks in advance!