How to Get file names?

[umarkhancodes]

I am working on action recognition, and am trying to use keras video generator for reading data.
I am implementing following pipeline:

1- get generator
2- feature extraction (c3d with output shape = None,4096 )
3- final model training

Now, after getting features (output from c3d), how can I know the file name for each feature vector? (i mean how can I know that which output feature belongs to which input file.)

Thanking in anticipation.