[Mp4-tech] MP4 file format?

[William Tsang{RPI Alum}]

Dave Singer wrote:
> The QuickTime file format is remarkably similar but is NOT the same as 
> MP4.  You cannot, for example, rename files between the two and have 
> it work.
>
> Was part 14 ever free to download?

Yea, i was reading the QuickTime file format doc and found out it's not 
really helping for me to parse thru a .mp4 file.  Somehow, i just can't 
find the any similar atom tags that's described in the Quicktime file 
format doc.  The .mp4 clip i created with a software call "MPEG4 Direct 
Maker" is able to playback with Quicktime player, so i guess that means 
that the .mp4 clip i created is using the ISO MP4 file format, 
otherwise, the QuickTime player won't play it right?
I also checked the price for the part14 doc and it's just too expensive 
to even think about it.  Anyone can point me some more direction of what 
i can do here? thanks
Will
P.S.:I remembered someone sent me an email asking me where to find the 
Quicktime doc too, here is the link
http://developer.apple.com/documentation/quicktime/FileFormatSpecification-date.html