The National Archives
Search our website
  • Search our website
  • Search our records
Image of software box and CD PRONOM
Welcome (PRONOM  home page) About PRONOM Add an entry
Search Help - opens in a new window Information resources - opens in a new window

*Details: File format summary



Search by keyword Search by file format Search by PUID Search by software Search by vendor Search by lifecycles Search by Migration Pathway

Details for:

Save as... XML | CSV Printer friendly version
Go to:  Summary  |  Documentation  |  Signatures |  Compression  |  Character encoding  |  Rights  |  Reference files   Properties  


External signatures File extension: 3gp
File extension: 3gpp
Internal signatures
Name 3GPP Audio/Video File
Description Header: The 4 letters 'ftyp' identifies the atom/box type as an ftyp box, the next 4 indicate the ftyp code for the "major brand". The brand sequence indicates the 'best use' of the file, and has several different profiles: basic, streaming-server, progressive-download, extended-presentation, media stream recording, file delivery, adaptive streaming.
Byte sequences
Position type Absolute from BOF
Offset 4
Byte order  
Value 667479703367(65|67|68|70|72|73|74)[34:39]0000[00:03]00
Top of page Top of page
The National Archives Newsletter Icon

Send me The National Archives’ newsletter

A monthly round-up of news, blogs, offers and events.