Certain dashcams, security cameras, or older digital cameras use alphanumeric prefixes for video files.
However, based on the most common contexts for this specific naming convention, here are the likely interpretations: 1. Messaging App Attachment (e.g., WhatsApp/Telegram) b5 (3).mp4
When a video is shared multiple times or saved from a chat, apps often rename the file sequentially. Certain dashcams, security cameras, or older digital cameras