ok so out of nowhere my car started making this chattering noise, its like a janky metal rattle noise coming from what sounds like the timing belts. i have a video so you can hear it yourself. it stays on the whole time warmed up or not it wont go away, my belts were changed about a year and a half ago total belt job tensioners and everything but the oil pump. can some one shed some light on what it actually is i would greatly appreaciate it.

here is the vid
A4 B5 Chattering noise - YouTube