How to stream on Twitch using your PS4 with NO capture card | Flixier
Amazon.com: SUBSONIC Raiden - Accessory Pack for Streaming Gamers and Youtubers, Full HD Video Capture Box, Microphone, HD Camera - PS4, PS5, Xbox Serie x: Xbox One, Switch, PC : Electronics
Twitch: PS4 streaming a 'game changer' for service - Polygon
PS4 will get its own Twitch App next month | Eurogamer.net