56mp4 〈2024-2026〉

While "MP4" is a ubiquitous digital multimedia container format (ISO/IEC 14496-14), "56mp4" is a recognized extension of this standard. If you encountered this as a file extension, it may be:

A or obfuscation method used by specific software. While "MP4" is a ubiquitous digital multimedia container

A where a number was accidentally appended. While "MP4" is a ubiquitous digital multimedia container