This is the most telling part. It indicates that this is the original, high-quality master file uploaded by a user before the platform compressed it into smaller versions (like 360p or 720p) for streaming.
The prefix 0hapj853j... is a unique hash. This is commonly seen on platforms that handle massive amounts of user-generated content to ensure that no two files have the same name. 0hapj853j6suzyi7idzlz_source.mp4
Metadata-heavy names like this are common in "archive" sites where users dump raw footage or leaked media before it is properly titled. 3. How to Identify the Content This is the most telling part