The "(5)" designation usually indicates this is the fifth segment in a serialized or chaptered version of the film [3]. Content Breakdown

MPEG-4 (MP4), a standard digital multimedia container used for high-quality video and audio [4].

The clip depicts the visual comedy of Alice growing and shrinking as she attempts to reach a manageable height to navigate the forest [2].

Walt Disney’s Alice in Wonderland (1951).

Alice meets the pipe-smoking Caterpillar on a mushroom. He famously questions her identity ("Who... are... you ?") and instructs her on how the mushroom can change her size [1, 5].