: Most computers use Windows Media Player or QuickTime to open MP4s automatically.
: High-end cameras or body cams often use a proprietary naming scheme where the numbers correspond to the session or frame count. Technical Characteristics of the MP4 Format 22193601.mp4
: Many CCTV and DVR systems name files based on a timestamp or a sequential record number (e.g., 22193601 ). : Most computers use Windows Media Player or