WARNING: [youtube] Falling back to generic n function search
         player = https://www.youtube.com/s/player/e7567ecf/player_ias.vflset/en_US/base.js
WARNING: [youtube] gqjZa6H4zU0: nsig extraction failed: Some formats may be missing
         n = hJQ03M_4LE04jTb_z ; player = https://www.youtube.com/s/player/e7567ecf/player_ias.vflset/en_US/base.js
WARNING: [youtube] Falling back to generic n function search
         player = https://www.youtube.com/s/player/e7567ecf/player_ias.vflset/en_US/base.js
WARNING: [youtube] gqjZa6H4zU0: nsig extraction failed: Some formats may be missing
         n = O_ApoQOv1fXKKC-V4 ; player = https://www.youtube.com/s/player/e7567ecf/player_ias.vflset/en_US/base.js