Anonymous 06/08/2017 (Thu) 06:29:33 No. 8545 del
Hmm, I use newsbeuter, have a query feed (basically an entry which includes entries for multiple feeds) and I filter them by age and some certain keywords but jesus christ I don't have 400+ channels I barely have like 10 and probably 2 of them are dead. I don't know if there's any practical solution for your case.

Just using newsbeuter and putting all of them into a query feed and checking that query feed full screen from time to time to see if there's anything interesting might do it but I'm not familiar with the way youtube shows videos to users (I know they introduced some follow feature or some bullshit)