In professional video workflows, "source" typically denotes the master file —the original high-quality version uploaded by the creator. CDNs then use this "source" to generate smaller, optimized versions (proxies) for streaming on different devices.
This 20-character string is likely a unique content ID generated at the time of upload. Systems like Wistia , Cloudinary , or proprietary corporate servers use these hashes to manage massive libraries of media without naming conflicts. 0h5ccfp39qgdja67qql3b_source.mp4
Files with this specific naming convention—a long, lowercase alphanumeric hash followed by "_source"—are characteristic of several professional environments: Systems like Wistia , Cloudinary , or proprietary
Tools like Frame.io or Sony Ci generate unique IDs for raw footage to ensure that if a file is moved between editors, the system can still track its metadata accurately. Systems like Wistia
Private hosting services (e.g., Vimeo OTT or Brightcove ) use these IDs to prevent "hotlinking," where people try to find the direct video URL to bypass paywalls or login screens.