MP4 Parser

Dear All,

Well I have the ISOMedia library for the MP4 parser,
When I pass the file of .M4a then I am able to extract the Audio Data
(.AAC) and while placing the appropiate ADTS header to all the AU
I am able to play it,

but the problem comes when I pass the .M4a which is made by Extracting
the Audio data From the .MP3 files by the tool quickTime, (itunes)
Menas Mp3 file ---> Qucik Time ----> .mp4 file
so when I pass this file then I am not able to play it,
So what is the problem in it, Please help,

I removed the IOD from the ISOmedia File as IOD is not supported in
the QuickTime File Format, But what i find is when I pass the file
then Some of the AU are written correctly and Some are not.

After seeing in depth i find that the Audio DATA is skipped while
writting into the file, Which gives the distorted file.

So how to fix this, Please suggest any idea on this So that i can
move further,

Thannks In Advance
Reagrds
Ranjeet