[Mp4-tech]Re: Mp4 header format

[ranjeet gupta]

Comment Below !!
>Hi ,

>Can any body tell me what is the difference between .ADTS/.ADIF 
>and .Mp4 file formats in AAC ?

ADTS and ADIF header are the headers which are used to add in the
audio raw compressed data (Which are extracted from the MP4 files),
For the sucessful play of the Audio File. (.aac)
Well both of the two are of diffrent formats. When we extract only the audio raw compressed data from the MP4 files, Then we place the 
ADTS/ADIF header, ADIS Header is added before each Frame/Samples,
While ADIF header is added before the Multiple Frame/samples taking as
one AU
While implementing the ADTS header will give more overhead and will 
degrade the efficency, As you have to Add for the each AU, While
ADIF header is less Overhead as compared to the ADTS header as in 
ADIF header you take the Multiplie AU. So it totally depends
on where you want to extract and which header you want to use,
depending on the Technology.
Most of the player to extract the AAC while placing the ADTS header
Such as Foobar, QTPlayer. etc, 
Please check the below link
http://www.mp3-tech.org/programmer/frame_header.html
http://www.audiocoding.com/modules/wiki/?page=ADTS&PHPSESSID=d0c503be4481eb5d92e0ed51cd8637de
>Is there specific structure of mp4 header as that for
>.mp3 file .

Nothing so specifc structure, But entierly Diffrent, For MP4 file
Read the Document QTFile Format, MP4File Format.
>I need to parse the .mp4 file , so could ne one of you help me >regarding this ?

HTH
Ranjeet Gupta
>Thanks
>Vishvanath

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