The string appears in internal CDN manifests (like Yandex) as part of an MP4 video session ID or file path used for automated content delivery.
Based on your search for "content: 5751.mp4," this specific filename or identifier is most prominently associated with two distinct contexts: 1. SCP-5751 (Fiction/Web Lore) 5751.mp4
If you are looking for a from a news event or a viral post, please provide a few more details about the subject matter (e.g., "a news clip about..." or "a video from [Platform]"). The string appears in internal CDN manifests (like