How to have Multiple labels in a single video?
Given that you have only 3 classes and that they closely depend on each other, I think it's worth trying a multiclass setting as WBM said. The idea is to label each video using the full combination of actions, since the maximum number of combinations is 2^3 = 8:

R-I-F
R-I
R-F
R
I-F
I
F
none

Probably some combinations of actions are impossible, so the number of classes is likely less than 8. Why this is a reasonable approach:

The setup is exactly the same, i.e. you can use the same labels and the predictions can be used the same way as in your multi-label approach
This is a &quot;joint model&quot;, i.e. a model which learns everything together and therefore can exploit fine-grained distinction between classes (e.g. between R-I-F and R-I).

However note that this kind of method may require more data, in particular it needs to have enough instances for each class.