If this is from a specific "master" or fan project, check the associated metadata/EXIF data for the original upload date and camera source.
1080p (1920x1080) or 4K (3840x2160) for modern fancams. Yeji-001.mp4
.mp4 (MPEG-4 Part 14), a universal container format compatible with almost all media players and social platforms. Common Origin: If this is from a specific "master" or
Professional photographers often use sequential numbering (001, 002) for raw video files from concerts or airport appearances. Yeji-001.mp4
If you received this file from an untrusted source, be aware that generic filenames like "Yeji-001.mp4" are sometimes used to disguise or adware .