051_ani_01 2k.mp4 -

Artists often use this format for numbered series.

Files from platforms like Adobe Stock or Shutterstock sometimes use similar strings. 051_ANI_01 2k.mp4

Because this name follows a technical naming convention (Asset ID + Animation + Version + Resolution), it is often associated with: Artists often use this format for numbered series

To help you find the exact "proper piece" or the source of this file, could you provide ? For example: this would represent Scene 51

In VFX or animation pipelines, this would represent Scene 51, Animation 1, rendered in 2K.