Question Re-binding missing bindings on a playable director prefab at runtime?

I have a system where I Instantiate a prefab with a timeline in it. This timeline uses mostly objects within its own prefab but uses a signal receiver in the scene along with a couple other elements.

How would I go about identifying the missing binds and re-binding them before playing the director? I found some very old posts from 2017 about rebinding but that method doesn't seem to work anymore and I'm looking to do the reverse where I check for missing bindings and replace them.

 

After some digging with a variant of things posted on the old thread I found; I managed to get a (mildly hacky) work around to re-bind missing objects in a timeline prefab.

I have a local class in my scene that contains an array of generic Objects and another array of the desired track names that I know will be missing bindings. It also has a unique "bind pack ID" which I use in editor to specify which director assets I am going to need. I will clean this up and make its own class for my own usage but here is what works currently in replacing missing bindings if it aids anyone else as a starting point at least.

Code (CSharp):

1.    
2.  
3.     public string bindPackID;
4.  
5.     public Object[] localAssets;
6.     public string[] localTrackNames;
7.  
8. void Start()
9. {
10.         //Get our Objects to replace missing bindings for a specific director
11.         localAssets = AnimationEventHandler.Ins.GetBidnigns(bindPackID);
12.  
13.         //Get the corresponding track names for missing bindings for the same director
14.         localTrackNames = AnimationEventHandler.Ins.GetBindingTrackNames(bindPackID);
15.  
16.         for (int i = 0; i < localAssets.Length; i++)
17.         {
18.             //Step through each track and see if their name matches our missing track names
19.             foreach (var PlayableAssetOutput in director.playableAsset.outputs)
20.             {
21.                 if (PlayableAssetOutput.streamName == localTrackNames[i])
22.                 {
23.                     //replace missing bind with corresponding object
24.                     director.SetGenericBinding(PlayableAssetOutput.sourceObject, localAssets[i]);
25.                 }
26.             }
27.         }
28. }

I'm including a picture of the editor window even though Unity is being Unity with it's UI drawing issues. But you can see I have two arrays and the track names corresponds with the elements of the same array index. I grab this list using the director ID from a script that sits on the prefab playable director game object.