Do you have any on where you found the file, or can you describe the audio or visuals inside? That might help in identifying the actual content.

Content Delivery Networks (like those used by Reddit, Twitter/X, or private backup services) use these strings to ensure every uploaded file has a unique name.

Filenames with this specific structure (long, random alphanumeric strings ending in _source.mp4 ) are commonly found in:

Because this is a generic system name, there is no "piece" (such as a specific song, movie, or art project) universally associated with it.