Anyone familiar with mp4 data structure?

Question

Where in the mp4 file structure is the duration of it?

Answer 1

Basically MP4 structure is a tree. Macro areas are:

• ftyp - file type
• moov - contains meta data (song title, autors, url, and other infos)
• free - empty area to separate header and data
• mdat - contains the audio frames

You can try this freeware MP4 Analyzer tool

http://www.thinmultimedia.co.kr/products/MP4Reader_download.html

Answer 2

See https://github.com/sannies/mp4parser project. It is a Java library that shows the structure of mp4 files.

Answer 3

Using MP4Parser http://code.google.com/p/mp4parser/ as previous poster mentioned - they even have a sample that provides duration:

https://mp4parser.googlecode.com/svn/trunk/examples/src/main/java/com/googlecode/mp4parser/GetDuration.java