This is in Fminor
i (Fminor11)
V/VI (Ab13)
tritone sub of Ab7 (D9#11, cant be a flat 5, because the A is already represented in the chord)
VI (Db6/9)
V (Calt7 or C7#9#5 ) Five chords in minor keys often use this type of 5
i (F11 in the traditional jazz voicing of Eb/F)
Fenix you were right about the tritone sub. See how he plays it one time and hangs on the Ab, yet in the second time, he could have really done the same thing, but used the tritone to keep it interesting. He's going to the same place both times. And Sjon I know you were keeping it simple, but you too were describing the movement of the tritone sub.
GCF
251
GGbF
2tt1
FDG
162
FAbG
1tt2