This is a universal digital multimedia container format commonly used for storing video and audio. HTML media or image source element - MDN Web Docs
The filename follows a standardized naming convention often used for raw or source video files uploaded to cloud storage, content delivery networks (CDNs), or video management platforms like YouTube or Amazon S3 . Breakdown of the Filename 0h9i392mmofrhyp6nz0dl_source.mp4
This is a 20-character alphanumeric hash typically used to uniquely identify a specific piece of media in a database. This is a universal digital multimedia container format