nice videos about [Quantum Mechanics](https://podcasts.ox.ac.uk/series/quantum-mechanics) (By J.J.Binney -Oxford),  total 27 videos with about 1 hour duration, and [QFT](http://www.damtp.cam.ac.uk/user/tong/qftvids.html) (By David Tong - Cambridge). Those videos about QM are really great here.