video if you're just masking a couple of frames in between it may be very easy to fill it up by just using the optical flow information and just using the reference frames and just interpolating between the pixels the model doesn't necessarily have to capture what an object is and whereas if you have a sentence and if you are predicting the missing words or sub words in a sentence it's possible that the model learns a lot more about the grammar and the syntax and semantics of collective language because it's it's not possible