[Mp4-tech] AAC file duration

[Madhurima.A aricent.com]

Hi
I am implemneting AAC player.
But I am facing problems in extracting the file duration. If I go and 
parse the whole file, time calculated is approximately same, but this 
takes considerable amount of time.
Can anybody help me on this.
How can I know the bit rate in case of a VBR file with ADTS/ADIF formats
Regards,
Madhurima
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