Efafpmp4

Commonly used by the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) for their online submission system.

Specifically referring to the "Application to Transfer and Register NFA Firearm". EFAFPmp4

A specialized version of the standard MP4 file format used for efficient internet streaming and faster processing of video data. Deep Dive into Fragmented MP4 (fMP4) Commonly used by the Bureau of Alcohol, Tobacco,