When you encounter a filename like this, it typically tells a story of its contents through a shorthand used by archivists and content creators:
Converting legacy formats to modern H.264 or H.265 MP4s. archivefhdsone454 2mp4 top
And that's the story of why I hate my dad. When you encounter a filename like this, it
A modern, high-performance player that handles HD video smoothly. archivefhdsone454 2mp4 top
These types of filenames are often generated automatically when a video is ripped from a streaming site and uploaded to a file host, or when a user is trying to bypass a paywall/streaming interface to get the raw file.