[Mp4-tech] [M4IF Technotes] questions on mp4 file format

[Ed B]

Hello,
	I've been tasked with the duty of determining all the differences between 
QuickTime's  .MOV file format and the .mp4 file format. The following link:
http://lists.mpegif.org/pipermail/mp4-tech/2002-February/000522.html
talks about one difference between the two file formats, However, I was left 
with the impression that there may be other differences. My questions are as 
follows:
1)What is an 'IOD' and what added value does it give to an Atom? Is it 
associated with all Atoms?
2)Is there a document/resource on the web that i can refer to for a detailed 
breakdown of the differences between the two file formats and/or a detailed 
description of new Atoms associated with the .mp4 file format that aren't 
documented in QuickTime's' file format document: 
http://developer.apple.com/documentation/QuickTime/QTFF/qtff.pdf
-Ed.