Sounds like the big end to me.
Does it occur under load on deceleration / acceleration?
seems nt a gd symptoms unfortunately mate!
the rattling noise comes when you rev the car and it gets louder through the revs...
Big end shells are worn, have you had any oil pressure issues, kept the oil levels in check? Although sometimes it is deceptive in the videos.
Avoid driving it otherwise you could score the crank.