Hi there,
you are using BeginPlay on the chroma bp, that event fires when the actor is being spawned and you have not yet correctly set the Director reference. You want to keep in synch, so call the SetRate every frame but be sure to check for object initialization: use “Is Valid” on director bp ref, and in any other references (MediaP, …).
In the second screenshot it seems that in the event track you are calling a function named “Sequence”, where you probably want to call your “SetUp” function