WARNING: [youtube] Falling back to generic n function search
         player = https://www.youtube.com/s/player/f3d47b5a/player_ias.vflset/en_US/base.js
WARNING: [youtube] ZMQiODkr0t8: nsig extraction failed: Some formats may be missing
         n = BfjRLJZG_cBOAZ8uI ; player = https://www.youtube.com/s/player/f3d47b5a/player_ias.vflset/en_US/base.js
WARNING: [youtube] Falling back to generic n function search
         player = https://www.youtube.com/s/player/f3d47b5a/player_ias.vflset/en_US/base.js
WARNING: [youtube] ZMQiODkr0t8: nsig extraction failed: Some formats may be missing
         n = KiPC921l9pq7bl1Bk ; player = https://www.youtube.com/s/player/f3d47b5a/player_ias.vflset/en_US/base.js