If you are looking to extract features from a specific file like Avatar 2 :

: A pre-trained model (like ResNet or VGG) "looks" at the frame and converts the visual data into a numerical vector (the deep feature).

: This technique speeds up video processing by running expensive calculations only on certain "key frames" and then propagating those deep feature maps to subsequent frames using a flow field.

: Using deep features allows systems to identify specific objects or scenes within a video (like a movie file) by comparing them to a query image.